TWI886143B - 高密度互連印刷電路板的製造順序及高密度互連印刷電路板 - Google Patents

高密度互連印刷電路板的製造順序及高密度互連印刷電路板 Download PDF

Info

Publication number
TWI886143B
TWI886143B TW109128288A TW109128288A TWI886143B TW I886143 B TWI886143 B TW I886143B TW 109128288 A TW109128288 A TW 109128288A TW 109128288 A TW109128288 A TW 109128288A TW I886143 B TWI886143 B TW I886143B
Authority
TW
Taiwan
Prior art keywords
copper
layer
hole
ion source
substrate
Prior art date
Application number
TW109128288A
Other languages
English (en)
Chinese (zh)
Other versions
TW202118365A (zh
Inventor
阿克夫 雅司卡
博特 雷恩斯
慕斯塔法 雅司卡
馬可 馬克米
馬可斯 尤克哈尼斯
霍司特 布格曼
史凡 藍彼奇
凱 珍斯 麥特傑特
Original Assignee
德商德國艾托特克公司
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 德商德國艾托特克公司 filed Critical 德商德國艾托特克公司
Publication of TW202118365A publication Critical patent/TW202118365A/zh
Application granted granted Critical
Publication of TWI886143B publication Critical patent/TWI886143B/zh

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00Electroplating: Baths therefor
    • C25D3/02Electroplating: Baths therefor from solutions
    • C25D3/38Electroplating: Baths therefor from solutions of copper
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/02Electroplating of selected surface areas
    • C25D5/022Electroplating of selected surface areas using masking means
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/18Electroplating using modulated, pulsed or reversing current
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00Electroplating characterised by the article coated
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00Apparatus or processes for manufacturing printed circuits
    • H05K3/40Forming printed elements for providing electric connections to or between printed circuits
    • H05K3/42Plated through-holes or plated via connections
    • H05K3/423Plated through-holes or plated via connections characterised by electroplating method
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00Apparatus or processes for manufacturing printed circuits
    • H05K3/40Forming printed elements for providing electric connections to or between printed circuits
    • H05K3/42Plated through-holes or plated via connections
    • H05K3/425Plated through-holes or plated via connections characterised by the sequence of steps for plating the through-holes or via connections in relation to the conductive pattern
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00Apparatus or processes for manufacturing printed circuits
    • H05K3/40Forming printed elements for providing electric connections to or between printed circuits
    • H05K3/42Plated through-holes or plated via connections
    • H05K3/429Plated through-holes specially for multilayer circuits, e.g. having connections to inner circuit layers
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10WGENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
    • H10W70/00Package substrates; Interposers; Redistribution layers [RDL]
    • H10W70/01Manufacture or treatment
    • H10W70/05Manufacture or treatment of insulating or insulated package substrates, or of interposers, or of redistribution layers
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10WGENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
    • H10W70/00Package substrates; Interposers; Redistribution layers [RDL]
    • H10W70/01Manufacture or treatment
    • H10W70/05Manufacture or treatment of insulating or insulated package substrates, or of interposers, or of redistribution layers
    • H10W70/095Manufacture or treatment of insulating or insulated package substrates, or of interposers, or of redistribution layers of vias therein
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09Shape and layout
    • H05K2201/09209Shape and layout details of conductors
    • H05K2201/095Conductive through-holes or vias
    • H05K2201/09563Metal filled via
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/07Treatments involving liquids, e.g. plating, rinsing
    • H05K2203/0703Plating
    • H05K2203/0716Metallic plating catalysts, e.g. for direct electroplating of through holes; Sensitising or activating metallic plating catalysts
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/07Treatments involving liquids, e.g. plating, rinsing
    • H05K2203/0703Plating
    • H05K2203/072Electroless plating, e.g. finish plating or initial plating
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/07Treatments involving liquids, e.g. plating, rinsing
    • H05K2203/0703Plating
    • H05K2203/0723Electroplating, e.g. finish plating
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/14Related to the order of processing steps
    • H05K2203/1492Periodical treatments, e.g. pulse plating of through-holes
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00Apparatus or processes for manufacturing printed circuits
    • H05K3/10Apparatus 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
    • H05K3/108Apparatus 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 semi-additive methods; masks therefor
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00Apparatus or processes for manufacturing printed circuits
    • H05K3/10Apparatus 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
    • H05K3/18Apparatus 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 using precipitation techniques to apply the conductive material
    • H05K3/181Apparatus 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 using precipitation techniques to apply the conductive material by electroless plating
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00Apparatus or processes for manufacturing printed circuits
    • H05K3/10Apparatus 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
    • H05K3/18Apparatus 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 using precipitation techniques to apply the conductive material
    • H05K3/181Apparatus 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 using precipitation techniques to apply the conductive material by electroless plating
    • H05K3/182Apparatus 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 using precipitation techniques to apply the conductive material by electroless plating characterised by the patterning method
    • H05K3/184Apparatus 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 using precipitation techniques to apply the conductive material by electroless plating characterised by the patterning method using masks
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00Apparatus or processes for manufacturing printed circuits
    • H05K3/10Apparatus 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
    • H05K3/18Apparatus 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 using precipitation techniques to apply the conductive material
    • H05K3/181Apparatus 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 using precipitation techniques to apply the conductive material by electroless plating
    • H05K3/187Apparatus 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 using precipitation techniques to apply the conductive material by electroless plating means therefor, e.g. baths, apparatus
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00Apparatus or processes for manufacturing printed circuits
    • H05K3/10Apparatus 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
    • H05K3/18Apparatus 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 using precipitation techniques to apply the conductive material
    • H05K3/188Apparatus 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 using precipitation techniques to apply the conductive material by direct electroplating
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00Apparatus or processes for manufacturing printed circuits
    • H05K3/46Manufacturing multilayer circuits
    • H05K3/4644Manufacturing multilayer circuits by building the multilayer layer by layer, i.e. build-up multilayer circuits
    • H05K3/4661Adding a circuit layer by direct wet plating, e.g. electroless plating; insulating materials adapted therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Materials Engineering (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Printing Elements For Providing Electric Connections Between Printed Circuits (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Manufacturing Of Printed Wiring (AREA)
  • Electroplating And Plating Baths Therefor (AREA)
  • Production Of Multi-Layered Print Wiring Board (AREA)
TW109128288A 2019-08-19 2020-08-19 高密度互連印刷電路板的製造順序及高密度互連印刷電路板 TWI886143B (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP19192262.4 2019-08-19
EP19192262 2019-08-19

Publications (2)

Publication Number Publication Date
TW202118365A TW202118365A (zh) 2021-05-01
TWI886143B true TWI886143B (zh) 2025-06-11

Family

ID=67659253

Family Applications (1)

Application Number Title Priority Date Filing Date
TW109128288A TWI886143B (zh) 2019-08-19 2020-08-19 高密度互連印刷電路板的製造順序及高密度互連印刷電路板

Country Status (7)

Country Link
US (1) US12063751B2 (https=)
EP (1) EP4018790A1 (https=)
JP (1) JP7651556B2 (https=)
KR (1) KR20220047373A (https=)
CN (1) CN114342569A (https=)
TW (1) TWI886143B (https=)
WO (1) WO2021032775A1 (https=)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI816388B (zh) * 2021-05-17 2023-09-21 美商麥克達米德恩索龍股份有限公司 在印刷電路板或其它基板上填充穿孔的單步電解法
US12052825B2 (en) * 2021-06-23 2024-07-30 International Business Machines Corporation Flexible circuit structure for circuit line bending
DE102021209537A1 (de) 2021-08-31 2023-03-02 Vitesco Technologies GmbH Transformator
CN114401584A (zh) * 2021-11-01 2022-04-26 安捷利美维电子(厦门)有限责任公司 一种高密度互联电路板层间互联结构及加工工艺
CN114928945B (zh) * 2022-05-27 2024-02-06 珠海达汉电子科技有限公司 超细线路印刷线路板的制作工艺
CN116367429A (zh) * 2023-03-17 2023-06-30 深圳市迅捷兴科技股份有限公司 含盲埋孔的电源电路板制造方法
CN118334275B (zh) * 2024-06-12 2024-08-20 芯瑞微(上海)电子科技有限公司 Pcb模型的层间自适应网格加密方法及相关设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070163887A1 (en) * 2004-01-29 2007-07-19 Hofmann Hannes P Method of manufacturing a circuit carrier and the use of the method
US20150289387A1 (en) * 2011-12-21 2015-10-08 Atotech Deutschland Gmbh Method for combined through-hole plating and via filling
US20180010258A1 (en) * 2014-12-05 2018-01-11 Atotech Deutschland Gmbh Method and apparatus for electroplating a metal onto a substrate
TW201907772A (zh) * 2017-06-28 2019-02-16 美商席拉電路公司 使用中介層及導電糊的多層電路板

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4344387C2 (de) 1993-12-24 1996-09-05 Atotech Deutschland Gmbh Verfahren zur elektrolytischen Abscheidung von Kupfer und Anordnung zur Durchführung des Verfahrens
DE19545231A1 (de) 1995-11-21 1997-05-22 Atotech Deutschland Gmbh Verfahren zur elektrolytischen Abscheidung von Metallschichten
JP3502979B2 (ja) * 1997-12-24 2004-03-02 グンゼ株式会社 電磁波シールド用透明部材とその製造方法
JP2001267726A (ja) 2000-03-22 2001-09-28 Toyota Autom Loom Works Ltd 配線基板の電解メッキ方法及び配線基板の電解メッキ装置
EP1148156A3 (en) * 2000-04-11 2004-02-04 Shipley Company LLC Copper Electroplating
TWI268966B (en) 2001-06-07 2006-12-21 Shipley Co Llc Electrolytic copper plating method
JP2005019577A (ja) * 2003-06-25 2005-01-20 Hitachi Cable Ltd 半導体装置用テープキャリアの製造方法
DE102004023161A1 (de) * 2004-05-07 2005-11-24 Eilenburger Elektrolyse- Und Umwelttechnik Gmbh Elektrolysezelle mit Mehrlagen-Streckmetall-Kathoden
DE102004045451B4 (de) 2004-09-20 2007-05-03 Atotech Deutschland Gmbh Galvanisches Verfahren zum Füllen von Durchgangslöchern mit Metallen, insbesondere von Leiterplatten mit Kupfer
DE502007005345D1 (de) 2006-03-30 2010-11-25 Atotech Deutschland Gmbh Elektrolytisches verfahren zum füllen von löchern und vertiefungen mit metallen
KR20090117237A (ko) * 2008-05-09 2009-11-12 삼성전기주식회사 전자소자 내장 인쇄회로기판 및 그 제조방법
US8388824B2 (en) * 2008-11-26 2013-03-05 Enthone Inc. Method and composition for electrodeposition of copper in microelectronics with dipyridyl-based levelers
US20100206737A1 (en) 2009-02-17 2010-08-19 Preisser Robert F Process for electrodeposition of copper chip to chip, chip to wafer and wafer to wafer interconnects in through-silicon vias (tsv)
US20110127673A1 (en) * 2009-12-01 2011-06-02 International Business Machines Corporation Wiring structure and method
US20120097547A1 (en) * 2010-10-25 2012-04-26 Universiteit Gent Method for Copper Electrodeposition
JP6114527B2 (ja) 2012-10-05 2017-04-12 新光電気工業株式会社 配線基板及びその製造方法
JP6077886B2 (ja) 2013-03-04 2017-02-08 株式会社荏原製作所 めっき装置
EP3034655A1 (en) * 2014-12-19 2016-06-22 ATOTECH Deutschland GmbH Trench pattern wet chemical copper metal filling using a hard mask structure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070163887A1 (en) * 2004-01-29 2007-07-19 Hofmann Hannes P Method of manufacturing a circuit carrier and the use of the method
US20150289387A1 (en) * 2011-12-21 2015-10-08 Atotech Deutschland Gmbh Method for combined through-hole plating and via filling
US20180010258A1 (en) * 2014-12-05 2018-01-11 Atotech Deutschland Gmbh Method and apparatus for electroplating a metal onto a substrate
TW201907772A (zh) * 2017-06-28 2019-02-16 美商席拉電路公司 使用中介層及導電糊的多層電路板

Also Published As

Publication number Publication date
JP2022545796A (ja) 2022-10-31
US20220304164A1 (en) 2022-09-22
US12063751B2 (en) 2024-08-13
TW202118365A (zh) 2021-05-01
WO2021032775A1 (en) 2021-02-25
CN114342569A (zh) 2022-04-12
EP4018790A1 (en) 2022-06-29
KR20220047373A (ko) 2022-04-15
JP7651556B2 (ja) 2025-03-26

Similar Documents

Publication Publication Date Title
TWI886143B (zh) 高密度互連印刷電路板的製造順序及高密度互連印刷電路板
EP2796019B1 (en) Method for combined through-hole plating and via filling
EP3439441B1 (en) Method for failure-free copper filling of a hole in a component carrier
KR101882530B1 (ko) 프린트 배선판의 제조 방법 및 프린트 배선판
WO2001029878A9 (en) Sequential electrodeposition of metals using modulated electric fields for manufacture of circuit boards having features of different sizes
TWI291221B (en) Printed circuit board, flip chip ball grid array board and method of fabricating the same
US12439528B2 (en) Method of preparing a high density interconnect printed circuit board including microvias filled with copper
JP2010171170A (ja) 銅回路配線基板およびその製造方法
CN102014589A (zh) 印刷线路板的制造方法
US11729917B2 (en) Method for optimized filling hole and manufacturing fine line on printed circuit board
JP4457843B2 (ja) 回路基板の製造方法
KR101752945B1 (ko) 구리 및 구리 합금의 에칭 방법
JP2005166917A (ja) プリント配線板およびその製造方法
JP2008218540A (ja) 配線基板の製造方法
JP2006339483A (ja) 配線基板の製造方法及び配線基板
KR100843367B1 (ko) 인쇄회로기판 및 그 제조방법
CN120379170A (zh) 高厚径比印制电路板的制备方法及高厚径比印制电路板