WO2002056651A1 - Carte de circuit imprime et sa production - Google Patents
Carte de circuit imprime et sa production Download PDFInfo
- Publication number
- WO2002056651A1 WO2002056651A1 PCT/JP2002/000134 JP0200134W WO02056651A1 WO 2002056651 A1 WO2002056651 A1 WO 2002056651A1 JP 0200134 W JP0200134 W JP 0200134W WO 02056651 A1 WO02056651 A1 WO 02056651A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- conductive
- conductive layer
- copper
- conductive material
- metal
- Prior art date
Links
Classifications
-
- 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
- H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
- H05K3/4038—Through-connections; Vertical interconnect access [VIA] connections
- H05K3/4053—Through-connections; Vertical interconnect access [VIA] connections by thick-film techniques
- H05K3/4069—Through-connections; Vertical interconnect access [VIA] connections by thick-film techniques for via connections in organic insulating substrates
-
- 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
- H05K1/09—Use of materials for the conductive, e.g. metallic pattern
- H05K1/092—Dispersed materials, e.g. conductive pastes or inks
- H05K1/095—Dispersed materials, e.g. conductive pastes or inks for polymer thick films, i.e. having a permanent organic polymeric binder
-
- 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
- H05K2201/03—Conductive materials
- H05K2201/0302—Properties and characteristics in general
- H05K2201/0305—Solder used for other purposes than connections between PCB or components, e.g. for filling vias or for programmable patterns
-
- 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
- H05K2201/03—Conductive materials
- H05K2201/0302—Properties and characteristics in general
- H05K2201/0317—Thin film conductor layer; Thin film passive component
-
- 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
- H05K2201/03—Conductive materials
- H05K2201/0332—Structure of the conductor
- H05K2201/0335—Layered conductors or foils
- H05K2201/0355—Metal foils
-
- 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
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/14—Related to the order of processing steps
- H05K2203/1461—Applying or finishing the circuit pattern after another process, e.g. after filling of vias with conductive paste, after making printed resistors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/49155—Manufacturing circuit on or in base
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T428/24917—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including metal layer
Definitions
- the present invention relates to an insulating substrate having a via hole filled with a conductive material, a circuit board having a conductive layer provided on both surfaces thereof, and a method for manufacturing the same.
- a conventional circuit board has a so-called glass epoxy board, which is a glass woven cloth impregnated with an epoxy resin, as an insulating base material, and a copper foil attached to both sides thereof by a hot press or the like.
- a pattern is formed by photo-etching the copper foil, a through-hole is formed by a drill, etc., and the inner wall of the through-hole is plated with copper, so that both sides of the through-hole are formed. Are connected.
- the plating liquid When plating is applied to the inside of the through hole, the plating liquid does not easily enter there, and there is a case where an unfastened part is formed and electrical connection is not made, resulting in poor reliability.
- the copper plating thickness becomes thinner at the back of the hole, causing electrical problems such as a large electrical resistance at the time of connection. Since it is difficult to mount components in the portion where the through-hole is formed and to mount a desired inner-layer through-hole in a multilayer laminated board, the pattern arrangement and process are restricted in the conventional board, and Miniaturization is also difficult.
- Disclosure of the invention A step of filling a via hole formed in the insulating base material with a conductive material, a step of providing a conductive layer on both surfaces of the insulating base material, a constituent material of the conductive material, and the conductive layer And a step of alloying the constituent materials of the above.
- the conductive material filled in the through via holes provided in the insulating base material and the conductive layers on both surfaces of the insulating base material are connected electrically and mechanically with high reliability.
- FIGS. 1A to 1D are cross-sectional views illustrating a method for manufacturing a circuit board according to Embodiment 1 of the present invention.
- FIGS. 2A to 2D are cross-sectional views illustrating a method for manufacturing a circuit board according to Embodiment 2 of the present invention.
- 3A to 3D are cross-sectional views illustrating a method for manufacturing a circuit board according to Embodiment 3 of the present invention.
- the insulating base material 101 is a so-called glass epoxy substrate in which glass cloth is impregnated and coated with epoxy resin, a woven fabric of resin fibers such as aramide, a resin substrate in which nonwoven fabric is impregnated with resin such as epoxy, or a polyimide substrate.
- This is a film substrate in which a resin such as an adhesive is applied to a resin film.
- a hole (via hole) 102 is formed in the insulating base material 101 by a laser or a drill such as carbon dioxide gas or YAG.
- the via hole 102 has a smaller hole diameter when formed with a laser than the mechanical method using a drill, and is smooth as if the periphery of the hole is melted. It is advantageous.
- the conductive material 103 may be, for example, copper, an alloy of copper and silver, or a copper-coated 0.1 alloy with another metal such as silver or gold.
- a paste-like material in which a granular metal such as a fine lump piece of about 50 m is mixed with an organic solvent or a resin is employed.
- copper is the cheapest and spherical particles can be obtained, but by mixing metals such as silver and gold, which have a lower hardness and lower electric resistance than copper, or coat the surface, silver and gold are pressed in a later step by pressing. Gold deforms.
- the conductive material 103 is filled by, for example, a method of printing the conductive material 103 from the opposite surface while vacuum-suctioning one side of the through via hole 102.
- a copper foil is provided as a conductive layer 104 on both sides of the insulating base material 101 having the through via hole 102 filled with the conductive material 103. It is. At least a region of the conductive layer 104 that is in contact with the conductive material 103 has a metal 105 alloyed with copper attached thereto. The melting point of metal 105 is lower than that of copper. Alloys with copper.
- the metal 105 is attached to the conductive layer 104 by a method such as plating or spraying a metal having a relatively low melting point, such as tin, zinc, silver, palladium, indium, and bismuth.
- the metal 105 when the metal 105 is granular, the area of the contact point is smaller, and the reaction energy due to the pressure, temperature, etc. applied per unit area increases, and the metal 105 is easily alloyed. Then, the conductive layers 104 provided on both sides are pressed from the outside while heating at least at the pressure and temperature at which the insulating base material 101 and the conductive layer 104 are bonded to each other.
- This temperature may be a temperature at which the alloying metal with copper is alloyed, and is a temperature of from 120 ° C. to 300 ° C., preferably from 200 ° C. to 270 °.
- indium has a melting point of 157 ° C and bismuth has a melting point of 271 ° C together with tin, and reactions such as alloying start at a temperature of about 60 to 70% of the melting point. When energy such as force or mechanical motion is applied, the reaction is further promoted. Also, This alloyed layer can be alloyed with about 10% or less of the entire copper, especially when tin containing 2332.degree. This is a desirable state of strength.
- zinc with melting points of 4 19 ° C, silver with 962 ° C, and palladium with a melting point of 554 ° C can form a diffusion layer, adhere, or be pressed even without alloying by melting. Therefore, the contact resistance can be greatly reduced.
- a reaction layer 106 formed by adhesion, pressure bonding, and alloying is formed at a connection portion at a boundary between the conductive layer 104 and the conductive material 103 filled in the through via hole.
- Copper for forming the reaction layer 106 and metal 105 which is alloyed with copper form a diffusion layer or an alloy layer only on the copper surface without almost melting copper. This increases the mechanical strength of the connection and reduces the resistance. Furthermore, since the low resistivity inherent to copper is maintained inside copper, a connection portion having low resistance and high mechanical strength can be obtained.
- FIG. 2A to 2D are cross-sectional views of a circuit board according to Embodiment 2 of the present invention.
- through via holes 202 are formed in an insulating substrate 201 such as a glass epoxy substrate, a resin substrate, or a film substrate as in the first embodiment.
- the through-holes 202 formed in the insulating base 201 are filled with a conductive material 203 made of a metal that does not contain copper and is alloyed with copper.
- the conductive material 203 is filled by, for example, a method of printing from one side of the through via hole 202 from the other side while vacuum-suctioning one side.
- Conductive material 203 has a lower melting point than copper, and is mainly heated by a hot press that heats together with pressure, due to a reaction between metals, such as adhesion or pressure bonding, which is not dependent on temperature, or by pressure applied by a press described later Alloys with copper by energy.
- a so-called soft metal having a relatively low melting point and small hardness such as tin, zinc, silver, palladium, conductive indium, and bismuth, is used. These are lead-free solder materials that do not use harmful lead.
- the conductive material 203 other materials that do not contain copper have a relatively high melting point and high hardness.
- a paste-like material mixed with an organic solvent or a resin is used.
- a conductive layer 204 such as a copper foil is provided on both surfaces of an insulating substrate 201 having a through via hole 202 filled with a conductive material 203. . Then, pressing is performed while heating at a pressure and temperature at which the insulating substrate 201 and the conductive layer 204 are bonded at least from the outside of the conductive layer 204. At this temperature, the conductive material 203 and the copper of the conductive layer 204 cause a reaction such as alloying at 120 ° C. or higher and 300 ° C. or lower, preferably 200 ° C. to 200 ° C. The temperature is 70 ° C.
- the conductive material 203 is granular. Therefore, the area of the contact point is small, the reaction energy depending on the pressure and temperature applied per unit area increases, and alloying is easy, and the conductive material 203 has low hardness inside the through via hole 202. Because of the soft metal, it can be deformed by the pressure of the press to increase the contact area and reduce the resistance inside the via hole 202. Nickel-chromium and molybdenum with high hardness and melting point as the core material for coating And tungsten are effective, and the conductive material 203 is relatively Pressure by press for a degree lower soft metal acts more effectively. That can reduce the contact resistance by contact touch area increases not only the alloying of the conductive material 2 0 3 together with the press.
- the reaction such as alloying starts at a temperature of about 60 to 70% of the melting point, and the reaction is further accelerated by applying energy such as pressure or mechanical motion.
- energy such as pressure or mechanical motion.
- this alloyed layer it is desirable to use an alloy containing about 10% or less of copper in tin in terms of resistance value ⁇ mechanical strength. Furthermore, even if alloying does not occur, a diffusion layer is formed, adhered or pressed, so that the contact resistance can be further reduced.
- 3A to 3D are cross-sectional views illustrating a method for manufacturing a circuit board according to Embodiment 3 of the present invention.
- the via hole 302 is filled with a conductive material 303 containing copper and a metal alloyed with copper.
- the conductive material 303 is filled by, for example, a method of printing from one side of the via hole 302 while vacuum-suctioning the other side.
- the metal that forms an alloy with the copper of the conductive material 303 has a lower melting point than copper. Is alloyed with copper mainly by the reaction of thermal energy.
- a soft metal having a relatively low melting point and a small hardness such as tin, zinc, silver, palladium, conductive indium, and bismuth
- the conductive material 303 containing copper include copper coated with these metals and other metals having a relatively high melting point and high hardness, alloys of these metals and copper, or single metals.
- a paste-like material in which a granular metal such as a fine lump piece of about 1 m to 50 m is mixed with an organic solvent or a resin is used.
- a conductive layer 304 such as a copper foil is provided on both surfaces of an insulating base material 301 having a through via hole 302 filled with a conductive material 303. Then, from the outside of the conductive layer 304, pressing is performed while heating at least at the pressure and temperature at which the insulating base material 301 and the conductive layer 304 are bonded to each other.
- the temperature of the conductive material The metal that forms an alloy with copper and the copper of the conductive layer 304 alloy with each other, and the copper of the conductive material 303 and the metal alloy with each other. The temperature is preferably from 200 ° C. to 270 ° C.
- the pressure is preferably higher, but may be a pressure at which the insulating substrate 301 is not excessively crushed, for example, 200 kcm 2 or less. Since the conductive material 303 is granular, the area of the contact point is small, and the reaction energy depending on the pressure, temperature, etc. applied per unit area is large, and alloying is easy. In addition, since the conductive material 303 is formed of a soft metal having a small hardness inside the via hole 302, the conductive material 303 is deformed by the pressure of the press, so that the contact area is increased and the inside of the via hole 302 is increased. Resistance can be reduced.
- the conductive material 303 As a core material coated in the conductive material 303, copper is effective because it is relatively inexpensive, has low electric resistance, and can obtain a finer spherical material. Even in other metals having a relatively high melting point and a high hardness, the pressure acts more effectively by pressing because the conductive material 303 contains a so-called soft metal having a relatively low hardness. That is, the pressing not only increases the contact area of the conductive materials 303 but also increases the contact area and decreases the contact resistance due to the metal having low electric resistance.
- the content of copper in the conductive material 303 should be 50% or less from the resistance value, and if it is 10% or less, it is desirable in terms of resistance value and mechanical strength. Further, a diffusion layer is formed, adheres, or is bonded by pressure even without alloying, so that the contact resistance between the conductive material 303 and the conductive layer 304 can be greatly reduced.
- connection portion As shown in FIG. 3D, copper and a metal alloyed with copper as described above are formed at the connection portion at the boundary between the conductive layer 304 and the conductive material 303 and in the through via hole 302 by pressing.
- a cohesive, crimped and alloyed reaction layer 306 is formed.
- copper and its metal need not substantially melt copper, and a diffusion layer or alloy layer may be formed only on the copper surface.
- the mechanical strength of the reaction layer 310 is improved and the resistance is reduced, and the copper inherent low resistance is maintained inside the copper particles contained in the reaction layer 310.
- a connection having low resistance and high mechanical strength can be obtained.
- the reaction such as alloying starts at a temperature of about 60 to 70% of the melting point, such as pressure and mechanical movement. When this energy is applied, the reaction is further promoted.
- a reaction layer in which the conductive layer and the conductive material adhere to each other, are bonded together, and are alloyed is formed.
- Circuit board with low resistance and high mechanical strength by maintaining the low resistivity inherent in copper inside the copper contained in them. .
- the resistance in the via hole of the conductive layer provided on both surfaces of the insulating base material is also reduced by the reaction layer inside the via hole.
- mechanically fixing the connection portion mechanical strength is increased, and reliability is improved.
- the via hole is filled with a conductive material, components can be mounted on the surface of the conductive layer in this portion, so that the size of the circuit board can be reduced and the wiring flexibility can be improved.
- the same effect can be obtained in a circuit board having a so-called blind via hole in which a conductive layer is previously formed on one surface of a through via hole. Further, a similar effect can be obtained also in a multilayer substrate by repeatedly adopting the steps in the embodiment. Further, the same effect can be obtained in a circuit board in which a conductive layer is formed by transferring a metal foil on which a pattern is formed in advance.
- the conductive layer is a copper foil, and the conductive material contains a metal alloying with copper.
- the conductive layer is made of another conductive substance instead of copper, and the conductive material is made of such a material. The same effect can be obtained even if a substance that alloys with a substance is contained. Industrial applicability
- the conductive material filled in the through via hole provided in the insulating base material and the conductive layers on both surfaces of the insulating base material are formed by alloying a part of the metal constituting these materials. It is electrically and mechanically connected with reliability and high reliability.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Printing Elements For Providing Electric Connections Between Printed Circuits (AREA)
- Parts Printed On Printed Circuit Boards (AREA)
- Production Of Multi-Layered Print Wiring Board (AREA)
- Manufacturing Of Printed Wiring (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60225508T DE60225508T2 (de) | 2001-01-15 | 2002-01-11 | Leiterplatte und verfahren zu ihrer herstellung |
US10/203,970 US7423222B2 (en) | 2001-01-15 | 2002-01-11 | Circuit board and method of manufacturing the same |
EP02729553A EP1278404B1 (en) | 2001-01-15 | 2002-01-11 | Circuit board and production method thereof |
US12/461,320 US20100025099A1 (en) | 2001-01-15 | 2009-08-07 | Circuit board and method of manufacturing the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001-006024 | 2001-01-15 | ||
JP2001006024A JP2002217510A (ja) | 2001-01-15 | 2001-01-15 | 基板の接続構造とその製造方法 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/203,970 A-371-Of-International US7423222B2 (en) | 2001-01-15 | 2002-01-11 | Circuit board and method of manufacturing the same |
US10/864,382 Division US20040221449A1 (en) | 2001-01-15 | 2004-06-10 | Circuit board and method of manufacturing the same |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002056651A1 true WO2002056651A1 (fr) | 2002-07-18 |
Family
ID=18873980
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/000134 WO2002056651A1 (fr) | 2001-01-15 | 2002-01-11 | Carte de circuit imprime et sa production |
Country Status (6)
Country | Link |
---|---|
US (3) | US7423222B2 (ja) |
EP (1) | EP1278404B1 (ja) |
JP (1) | JP2002217510A (ja) |
CN (1) | CN1287647C (ja) |
DE (1) | DE60225508T2 (ja) |
WO (1) | WO2002056651A1 (ja) |
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US6992001B1 (en) * | 2003-05-08 | 2006-01-31 | Kulicke And Soffa Industries, Inc. | Screen print under-bump metalization (UBM) to produce low cost flip chip substrate |
JP3979391B2 (ja) * | 2004-01-26 | 2007-09-19 | 松下電器産業株式会社 | 回路形成基板の製造方法および回路形成基板の製造用材料 |
JP4593331B2 (ja) * | 2005-03-24 | 2010-12-08 | 古河電気工業株式会社 | 積層回路基板とその製造方法 |
JP4609849B2 (ja) * | 2005-08-01 | 2011-01-12 | 古河電気工業株式会社 | 積層回路基板 |
JP4609850B2 (ja) * | 2005-08-01 | 2011-01-12 | 古河電気工業株式会社 | 積層回路基板 |
JP5114858B2 (ja) * | 2006-03-28 | 2013-01-09 | 富士通株式会社 | 多層配線基板およびその作製方法 |
US7910837B2 (en) * | 2007-08-10 | 2011-03-22 | Napra Co., Ltd. | Circuit board, electronic device and method for manufacturing the same |
JP2008160150A (ja) * | 2008-02-15 | 2008-07-10 | Matsushita Electric Ind Co Ltd | 基板の製造方法 |
JP5250582B2 (ja) * | 2010-04-22 | 2013-07-31 | 有限会社 ナプラ | 充填用基材及びそれを用いた充填方法 |
US8491315B1 (en) * | 2011-11-29 | 2013-07-23 | Plastronics Socket Partners, Ltd. | Micro via adapter socket |
US8987606B2 (en) | 2011-12-13 | 2015-03-24 | Empire Technology Development Llc | Elastomer adhesions |
JPWO2013118455A1 (ja) * | 2012-02-08 | 2015-05-11 | パナソニックIpマネジメント株式会社 | 抵抗形成基板とその製造方法 |
US10402232B2 (en) * | 2013-02-11 | 2019-09-03 | Wind River Systems, Inc. | Method and system for deterministic multicore execution |
CN103596362B (zh) * | 2013-11-08 | 2016-08-31 | 溧阳市江大技术转移中心有限公司 | 一种具有交错间隔的合金柱的印刷电路板 |
CN113311959B (zh) * | 2021-05-18 | 2023-01-17 | 维沃移动通信有限公司 | 显示组件及电子设备 |
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2001
- 2001-01-15 JP JP2001006024A patent/JP2002217510A/ja active Pending
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2002
- 2002-01-11 CN CN02800069.2A patent/CN1287647C/zh not_active Expired - Fee Related
- 2002-01-11 US US10/203,970 patent/US7423222B2/en not_active Expired - Fee Related
- 2002-01-11 DE DE60225508T patent/DE60225508T2/de not_active Expired - Lifetime
- 2002-01-11 EP EP02729553A patent/EP1278404B1/en not_active Expired - Lifetime
- 2002-01-11 WO PCT/JP2002/000134 patent/WO2002056651A1/ja active IP Right Grant
-
2004
- 2004-06-10 US US10/864,382 patent/US20040221449A1/en not_active Abandoned
-
2009
- 2009-08-07 US US12/461,320 patent/US20100025099A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07115255A (ja) * | 1993-10-20 | 1995-05-02 | Matsushita Electric Ind Co Ltd | プリント配線板およびその製造方法 |
JPH11251703A (ja) * | 1998-02-27 | 1999-09-17 | Matsushita Electric Ind Co Ltd | 回路基板、両面回路基板、多層回路基板及び回路基板の製造方法 |
EP0955795A2 (en) * | 1998-05-08 | 1999-11-10 | Matsushita Electric Industrial Co., Ltd. | Conductive paste for filing via-hole, double-sided and multilayer printed circuit boards using the same, and method for producing the same |
Non-Patent Citations (1)
Title |
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See also references of EP1278404A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP1278404A1 (en) | 2003-01-22 |
CN1287647C (zh) | 2006-11-29 |
US20040221449A1 (en) | 2004-11-11 |
US20030039811A1 (en) | 2003-02-27 |
DE60225508T2 (de) | 2008-06-19 |
EP1278404A4 (en) | 2005-07-20 |
DE60225508D1 (de) | 2008-04-24 |
JP2002217510A (ja) | 2002-08-02 |
US20100025099A1 (en) | 2010-02-04 |
CN1456031A (zh) | 2003-11-12 |
US7423222B2 (en) | 2008-09-09 |
EP1278404B1 (en) | 2008-03-12 |
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