WO2005107350A1 - 多層プリント配線板 - Google Patents
多層プリント配線板 Download PDFInfo
- Publication number
- WO2005107350A1 WO2005107350A1 PCT/JP2005/008567 JP2005008567W WO2005107350A1 WO 2005107350 A1 WO2005107350 A1 WO 2005107350A1 JP 2005008567 W JP2005008567 W JP 2005008567W WO 2005107350 A1 WO2005107350 A1 WO 2005107350A1
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- WIPO (PCT)
- Prior art keywords
- layer
- conductor
- printed wiring
- wiring board
- multilayer printed
- Prior art date
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- 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
- H05K1/0271—Arrangements for reducing stress or warp in rigid printed circuit boards, e.g. caused by loads, vibrations or differences in thermal expansion
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- 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
- H05K3/46—Manufacturing multilayer circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
- H01L23/49811—Additional leads joined to the metallisation on the insulating substrate, e.g. pins, bumps, wires, flat leads
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- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
- H01L23/49811—Additional leads joined to the metallisation on the insulating substrate, e.g. pins, bumps, wires, flat leads
- H01L23/49816—Spherical bumps on the substrate for external connection, e.g. ball grid arrays [BGA]
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- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
- H01L23/49822—Multilayer substrates
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- 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
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- 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
- H05K1/11—Printed elements for providing electric connections to or between printed circuits
- H05K1/115—Via connections; Lands around holes or via connections
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- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
- H01L2224/161—Disposition
- H01L2224/16151—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/16221—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/16225—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
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- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
- H01L2224/161—Disposition
- H01L2224/16151—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/16221—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/16225—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
- H01L2224/16235—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation the bump connector connecting to a via metallisation of the item
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- H01L2924/0001—Technical content checked by a classifier
- H01L2924/00011—Not relevant to the scope of the group, the symbol of which is combined with the symbol of this group
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- H01L2924/0001—Technical content checked by a classifier
- H01L2924/00014—Technical content checked by a classifier the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
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- H01L2924/01077—Iridium [Ir]
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- H01L2924/01—Chemical elements
- H01L2924/01079—Gold [Au]
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- 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
- H05K2201/01—Dielectrics
- H05K2201/0104—Properties and characteristics in general
- H05K2201/0133—Elastomeric or compliant polymer
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- 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
- H05K2201/0364—Conductor shape
- H05K2201/0367—Metallic bump or raised conductor not used as solder bump
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- 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
- H05K2201/06—Thermal details
- H05K2201/068—Thermal details wherein the coefficient of thermal expansion is important
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- 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
- H05K2201/10613—Details of electrical connections of non-printed components, e.g. special leads
- H05K2201/10621—Components characterised by their electrical contacts
- H05K2201/10674—Flip chip
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- 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
- H05K3/22—Secondary treatment of printed circuits
- H05K3/28—Applying non-metallic protective coatings
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- 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
- H05K3/4007—Surface contacts, e.g. bumps
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- 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
- H05K3/46—Manufacturing multilayer circuits
- H05K3/4602—Manufacturing multilayer circuits characterized by a special circuit board as base or central core whereon additional circuit layers are built or additional circuit boards are laminated
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- 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.
- Y10T29/49126—Assembling bases
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- 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.
- Y10T29/49147—Assembling terminal to base
- Y10T29/49151—Assembling terminal to base by deforming or shaping
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- 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
- Y10T29/49162—Manufacturing circuit on or in base by using wire as conductive path
Definitions
- the present invention relates to a multilayer printed wiring board. Background art
- Such a multilayer printed wiring board includes a core substrate, a build-up layer formed on the core substrate, and mounting electrodes on which an IC chip is mounted via a solder bump on an upper surface of the build-up layer. What is provided is known.
- an epoxy resin a BT (bismaleimide 'triazine) resin, a polyimide resin, a polybutadiene resin, a phenol resin, or the like, which is molded together with a reinforcing material such as glass fiber
- the thermal expansion coefficient of the core substrate is about 12 to 20 ppm / (30 to 200 ° C), which is about the same as the thermal expansion coefficient of silicon for IC chips (about 3.5 ppm / V). 4 times larger. Therefore, in the above-mentioned flip-chip method, when the temperature change accompanying the heat generation of the IC chip repeatedly occurs, the solder bumps break due to the difference in the amount of thermal expansion and contraction between the IC chip and the core substrate. could be done.
- a low-elasticity stress relaxation layer is provided on the build-up layer, and a mounting electrode is provided on the upper surface of the stress relaxation layer.
- a multilayer printed wiring board in which the above conductor pattern and the mounting electrode are connected by a conductor boss has been proposed (for example, Japanese Patent Application Laid-Open No. 58-28848, Japanese Patent Publication No. No. 6,253). Disclosure of the invention
- the IC chip realizes the miniaturization and multilayering of the wiring for each generation, but with the miniaturization of the wiring, the signal delay in the wiring layer becomes dominant and hinders the increase in speed. Since this delay time is proportional to the wiring resistance and the capacitance between the wirings, it is necessary to lower the resistance of the wiring and to reduce the capacitance between the wirings in order to further increase the speed.
- the reduction of the capacitance between wirings is realized by lowering the dielectric constant of the interlayer insulating film.
- a method of introducing air (dielectric constant ⁇ ⁇ ⁇ ) into a heat-resistant material specifically, a porous method (porosity) is generally used.
- the present invention has been made to solve such a problem, and it is possible to prevent rupture of an outer peripheral portion of an electronic component due to thermal expansion and thermal contraction and to stably supply power to the electronic component.
- An object is to provide a multilayer printed wiring board. It is another object of the present invention to provide a method for manufacturing such a multilayer printed wiring board.
- the present invention employs the following means in order to achieve the above object.
- the present invention provides a core substrate, a build-up layer formed on the core substrate and provided with a conductor pattern on an upper surface, and a build-up layer formed on the pillar-up layer.
- a low-modulus layer a mounting electrode provided on an upper surface of the low-modulus layer and connected to an electronic component through a connection portion, and a mounting electrode that penetrates through the low-modulus layer.
- a conductor boss for electrically connecting the conductor pattern to the conductor pattern.
- the conductor boss has an aspect ratio R asp of 4 or more and a diameter exceeding 30 xm, and the aspect ratio R asp of the outer conductor boss disposed on the outer peripheral portion of the low elastic layer in the conductor boss.
- the conductor post has an aspect ratio R asp of 4 or more and the diameter exceeds 30, and the aspect ratio R asp of the outer conductor post is greater than the aspect ratio R asp of the inner conductor post.
- the side conductor boss deforms in response to the deformation of the low elasticity layer while maintaining the electrical connection between the mounting electrode and the conductor pad on the upper surface of the build-up layer. Therefore, according to this multilayer printed wiring board, even if a stress is generated due to a difference in thermal expansion coefficient between the core substrate and the electronic component, the electronic component (especially an IC chip having a porous interlayer insulating film) can be used.
- the aspect ratio R asp of the conductor post refers to the height of the conductor post and the diameter of the conductor post (the minimum diameter when the diameter is not the same).
- “upper” or “upper surface” merely represents a relative positional relationship, and may be replaced with, for example, “lower” or “lower surface”.
- the aspect ratio R asp of the outer conductor post among the conductor posts is the aspect ratio R asp of the inner conductor post. 2005/008567
- the outer conductor bost among the conductor bosts is formed in a shape having cracks.
- the effects of the present invention can be obtained more reliably as compared with the conductor posts having a substantially straight shape.
- the outer conductor boss formed in such a shape having a crack has a maximum diameter Z and a minimum diameter of 2 or more and 4 or less.
- the outer conductor posts are multiplexed from the outermost periphery to the Nth row (N is an integer of 2 or more), the outer conductor posts are arranged in the range from the outermost periphery to NX 2/3 rows. It is preferable to determine within. Since the stress applied to the conductor boss within this range is greater than the stress applied to other conductor bosses, the application of the present invention is significant. For example, when N is 15, the outer conductor bost is determined within the range from the outermost row to the 10th row. Therefore, only the outermost row, 1st row, the outermost row to 2nd row,. There is a way to determine up to the 10th column.
- the low elastic modulus layer may be formed so as to substantially coincide with the entire projected portion when the electronic component is virtually projected on the low elastic modulus layer side.
- the low-modulus layer may be formed over the entire area of the projected portion, but the effect can be sufficiently obtained if it substantially coincides with the entire area of the projected portion. It is preferable to form them so as to substantially coincide with the entire region.
- an electronic component such as a chip capacitor may be mounted in a region where the low elastic modulus layer is not formed. In this case, since the distance between the chip capacitor and the IC chip is short, if the power is supplied from the chip capacitor, the IC chip does not easily become short of power.
- the mounting electrode is a low elastic modulus layer. 05008567
- the mounting electrode can be easily manufactured as compared with the case where the mounting electrode is formed separately from the conductor post.
- the low modulus layer preferably has a Young's modulus at 30 ° C. of 1 OMPa to 1 GPa. In this case, the stress caused by the difference in the coefficient of thermal expansion can be more reliably reduced.
- the low modulus layer has a Young's modulus at 30 ° C. of preferably from 10 MPa to 300 MPa, most preferably from 10 MPa to 10 OMPa.
- the conductor post is preferably formed of a material having good conductivity, and is preferably formed of, for example, copper, solder, or an alloy containing any of these.
- the electronic component preferably includes an IC chip having a porous interlayer insulating film. Since the outer peripheral portion of this type of electronic component is easily broken due to thermal expansion and thermal contraction, the application of the present invention is significant.
- FIG. 1 is a cross-sectional view of the multilayer printed wiring board of the present embodiment.
- FIG. 2 is an arrangement diagram of the conductor posts of the present embodiment.
- FIG. 3 is a layout view of another conductor post.
- FIG. 4 is an explanatory diagram illustrating a procedure for manufacturing the multilayer printed wiring board of the present embodiment.
- FIG. 5 is a cross-sectional view illustrating a procedure for manufacturing the multilayer printed wiring board of the present embodiment.
- FIG. 6 is a cross-sectional view illustrating a procedure for manufacturing the multilayer printed wiring board of the present embodiment. 5 008567
- FIG. 7 is a cross-sectional view illustrating another procedure for manufacturing the multilayer printed wiring board of the present embodiment.
- FIG. 8 is a cross-sectional view of another multilayer printed wiring board.
- FIG. 9 is a table and a graph showing the relationship between the position of the IC chip and the stress applied to the position.
- FIG. 1 is a cross-sectional view of a multilayer printed wiring board according to one embodiment of the present invention. Note that the terms “up” and “down” are used below, but this is only a convenient expression of the relative positional relationship. Or you may.
- the multilayer printed wiring board 10 of the present embodiment is a core substrate that electrically connects wiring patterns 22 formed on both upper and lower surfaces via through-hole conductors 24.
- a build-up layer 30 in which a plurality of conductor patterns 3 2, 32 laminated above and below the core substrate 20 via a resin insulating layer 36 are electrically connected by via holes 34
- a low elastic modulus layer 40 formed of a low elastic modulus material on the upper layer 30 and a land (mounting electrode) 52 for mounting an IC chip 70 as an electronic component via a solder bump 66
- a conductor post 50 that penetrates through the low elastic modulus layer 40 and electrically connects the land 52 with the conductor pattern 32 formed on the upper surface of the build-up layer 30.
- the conductor post 50 is formed in a portion extending from the via hole 34.
- the via hole 34 may be filled with a conductive material to form a filled via, and the filled via may be formed immediately above the filled via.
- the pitch between the conductor boasts 50 can be reduced by reducing the pitch of the via holes 34.
- the core substrate 20 is made of a wiring pattern 2 2, 2 2 made of copper on the upper and lower surfaces of a core substrate body 21 made of BT (bismaleimide-triazine) resin, glass epoxy resin, or the like.
- a through-hole conductor 24 made of copper formed on the inner peripheral surface of the through-hole that penetrates. Both wiring patterns 22 and 22 are electrically connected through the through-hole conductor 24. ing.
- the build-up layer 30 is formed by alternately laminating a resin insulation layer 36 and a conductor pattern 32 on both the upper and lower surfaces of the core substrate 20, and includes a wiring pattern 22 of the core substrate 20 and a build-up layer 30. Electrical connection with the conductor pattern 32 The electrical connection between the conductor patterns 32 and 32 in the build-up layer 30 is ensured by via holes 34 penetrating above and below the resin insulation layer 36. I have.
- Such a build-up layer 30 is formed by a well-known subtractive method / additive method (including a semi-additive method and a full additive method). Specifically, for example, it is formed as follows.
- a resin sheet to be the resin insulating layer 36 is attached to the upper and lower surfaces of the core substrate 20.
- This resin sheet is formed of a modified epoxy resin sheet, a polyphenylene ether resin sheet, a polyimide resin sheet, a cyanoester resin sheet, etc., and has a thickness of approximately 20 to 80 m. .
- a through-hole is formed in the adhered resin sheet by using a carbon dioxide gas laser, a UV laser, a YAG laser, an excimer laser, or the like to form a resin insulating layer 36.
- the wiring pattern 32 is formed by etching the electroless copper plating at the portion where the resist was present, using a sulfuric acid / hydrogen peroxide based etchant.
- the conductor layer inside the through hole becomes the via hole 34.
- the build-up layer 30 is formed on the back surface.
- a solder resist layer 45 is formed on the back surface.
- the low elastic modulus layer 40 has an elasticity whose Young's modulus at 30 ° C. is 10 to 100 MPa (preferably 10 to 30 O MPa, more preferably 10 to 100 MPa). Made of material. If the Young's modulus of the low elastic modulus layer 40 is within this range, the thermal expansion coefficient between the IC chip 70 and the core substrate 20 electrically connected to the land 52 via the solder bumps 66 Even if a stress caused by the difference occurs, the stress can be reduced.
- the elastic material used for the low elastic modulus layer 40 include thermosetting resins such as epoxy resin, imide resin, phenol resin, and silicone resin, and polyolefin resin, vinyl resin, and imido resin.
- thermoplastic resins there are resins in which rubber components such as polybutadiene, silicone rubber, urethane, SBR, and NBR and inorganic components such as silica, alumina, and zirconia are dispersed, and those that match the Young's modulus described above.
- the components dispersed in the resin may be one type or two or more types, and both the rubber component and the inorganic component may be dispersed.
- the elastic material of the low elastic modulus layer 40 a resin in which 60% of urethane resin is dispersed in epoxy resin is used.
- the conductor bost 50 is formed mainly of copper so as to penetrate the low elasticity layer 40 in the vertical direction, and electrically connects the land 52 with the conductor pattern 32 provided on the upper surface of the build-up layer 30. Connected.
- the conductor post 50 is formed in a shape having cracks, specifically, a shape in which the diameter of the middle part is smaller than the diameter of the upper part and the diameter of the lower part.
- outer conductor posts 50a those arranged on the outer periphery of the low elastic modulus layer 40
- inner conductor posts 50a those arranged on the inner periphery are referred to as inner conductor posts 50a.
- FIG. 1 only a few conductor posts 50 are shown for convenience. 005/008567
- the outer conductor post 50a is determined, and the rest is defined as the inner conductor post 50b.
- the aspect ratio R asp that is, the ratio of the height to the diameter (minimum diameter) of the middle part is 4 or more, and the minimum diameter is 3 Above 0 im.
- the aspect ratio R asp of the outer conductor post 50 a is designed to be greater than the aspect ratio R asp of the inner conductor post 50 Ob, specifically, the aspect ratio of the outer conductor post 50 b.
- R asp is designed so that the aspect ratio R asp of the inner conductor post 50b is equal to or more than 1.25 times and equal to or less than 2 times.
- the outer conductor post 50a is formed so that the maximum diameter Z and the minimum diameter are 2 or more and 4 or less.
- FIG. 2 shows an example in which the conductor posts 50 are arranged in a grid pattern, the conductor posts 50 may be arranged in a staggered pattern as shown in FIG. 3, or may be randomly arranged if the rows can be counted from the outer periphery. It may be arranged.
- the land 52 is the top of each conductor post 50 exposed from the low elastic modulus layer 40.
- the lands 52 are connected to the electrodes of the IC chip 70 via solder bumps 66 after nickel plating and gold plating are applied in this order.
- the IC chip 70 employs a porous interlayer insulating film into which air (dielectric constant ⁇ ⁇ ⁇ ) is introduced so that high-speed operation, that is, high-frequency driving is possible, and the capacitance between wirings is reduced. The reduced one is used.
- a core substrate 20 on which a build-up layer 30 was formed was prepared (see FIG. 4A).
- the surface of the uppermost resin insulating layer 36 remains covered with the electroless copper plating layer 304. That is, by applying electroless copper plating to the resin insulating layer 36 after the formation of the through-hole, an electroless copper plating layer 304 is formed, and a photoresist is formed on the electroless copper plating layer 304. After patterning, electrolytic copper plating is applied to areas where no photoresist is formed, and then the photoresist is peeled off.
- the electrolytic copper plating layer is patterned into a patterned plating layer 302, but the electroless copper plating layer 304 covers the entire surface of the resin insulating layer 36.
- a commercially available dry film 303 (CX-A240 manufactured by Asahi Kasei Co., Ltd., two layers, total thickness 240 zm) was bonded, and a carbon dioxide laser was applied.
- a large-diameter hole 308a was formed in the outer peripheral portion of the substrate (see FIG. 4B). This hole 308a reaches the patterned plating layer 302.
- the inside of the hole 3 08 a was filled with the columnar copper layer 3 10 a by performing electrolytic copper plating from the bottom of the hole 3 0 8 a of the dry film 3 06. Then, a solder layer 312 was formed on the upper surface of the copper layer 310a (see FIG. 4 (c)).
- the electrolytic copper plating solution used had the following composition. Sulfuric acid 2.24 mol 1 copper sulfate 0.26 mol Zl, additive 19.5 m 1/1 (Atotech Japan Co., Capparaside GL). The electrolytic copper plating was performed under the following conditions. Current density l AZdm2, time 17 hours, temperature 22 ⁇ 2 ° C. In addition, Sn / Pb was used for the solder layer 312.
- the etching was performed by dipping in This etching removes the portion of the electroless copper plating layer 304 that is not covered by the electrolytic copper plating layer 302, and erodes the middle of the columnar copper layer 310a, causing cracks. (See Fig. 4 (d)).
- the solder layer 312 functioned as an etching resist.
- the extent to which the middle portion of the copper layer 310a is eroded can be controlled by the etching time.
- an electroless copper plating layer 314 was formed by performing electroless copper plating on the entire surface of the substrate during the fabrication (see FIG. 5 (a)).
- the thickness of the electroless copper plating layer 314 is several meters.
- a commercially available liquid resist agent was applied in a non-contact state with Alpha Co., Ltd. (trade name, Samatronics Trading Co., Ltd.) so as to cover the entire surface, and then dried to form a resin layer 320.
- a small-diameter hole 308b was formed in the inner periphery of the substrate using a carbon dioxide laser (see Fig. 5 (b)).
- the hole 308 a provided earlier was set to 120 m
- the hole 308 b provided this time was set to ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ .
- electrolytic copper plating was performed from the bottom of the hole 3108b of the resin layer 320, so that the inside of the hole 3108b was formed by the columnar copper layer 310b.
- a solder layer 322 was formed on the upper surface of the copper layer 310b (see FIG. 5C), and then the resin layer 320 was peeled off (see FIG. 5D).
- the electrolytic copper plating solution used had the following composition. Sulfuric acid 2.24 mol Zl, copper sulfate 0.26 mo 11, additive 19.5 m 1/1 (Captoside GL, manufactured by Atotech Japan KK).
- the electrolytic copper plating was performed under the following conditions. Current density l AZdm ⁇ time 17 hours, temperature 22 ⁇ 2 ° C. Further, SnZPb was used for the solder layer 3222.
- etching was performed by immersing the substrate in the course of fabrication in an ammonia alkali etching solution (trade name: A process, manufactured by Meltex Co., Ltd.).
- an ammonia alkali etching solution (trade name: A process, manufactured by Meltex Co., Ltd.).
- etching a fresh etching solution was sprayed from the periphery of the substrate, so that the copper layer 310a standing on the outer periphery of the substrate was replaced with the copper layer 310b standing on the inner periphery.
- the middle part was eroded more than in the middle.
- the electrolytic copper plating layer 302 and the electroless copper plating layer 304 the upper surface of the resin insulating layer 36 became the conductor pattern 32, and the through-hole became the via hole 34.
- the solder layers 312 and 3222 functioned as an etching resist.
- the extent to which the middle part of the copper layer 310a is eroded can be controlled by the etching time.
- a solder resist layer 45 having an opening was formed on the back surface. .
- the substrate in the process of being manufactured is immersed in a solder release agent (trade name: Enstrip TL-106, manufactured by Meltex Co., Ltd.) to remove the solder layers 3 12 and 3 2 2.
- a resin film in which the resin was dispersed at 60 V o 1% was attached (see FIG. 6 (b)), and cured at 150 ° C. for 60 minutes to obtain a resin layer 324.
- the copper layer 310a became the outer conductor post 50a
- the electroless copper plating layer 314 and the copper layer 310b became the inner conductor post 50b.
- the resin layer 324 was polished until the surfaces of the outer conductor boss 50a and the inner conductor boss 50b were exposed (see FIG. 6 (c)).
- the resin layer 324 after polishing becomes the low elastic modulus layer 40.
- the tops of the conductor bushings 50 a and 50 b exposed from the low elastic modulus layer 40 become the lands 52.
- the substrate in the course of the preparation was immersed in an acidic solution containing a palladium catalyst for activating the copper surface, and then 30 g of nickel chloride and sodium hypophosphite were added. 5008567
- the substrate was electrolessly plated with 2 g / 1 gold cyanide, 75 g / 1 ammonium chloride, 5 Og / l sodium citrate, and 10 g / 1 sodium hypophosphite. It was immersed in the solution at 93 ° C for 23 seconds to form a gold plating layer having a thickness of 0.03 on the nickel plating layer. Then, the solder paste is printed using a mask pattern and reflowed at 230 ° C. to form solder bumps 66 on the lands 52, thereby completing the production of the multilayer printed wiring board 10. (See Fig. 6 (d) and Fig. 1).
- both the outer conductor bost 50a and the inner conductor bost 50b have an aspect ratio Rasp of 4 or more and a diameter of 30%. izm, and the aspect ratio R asp of the outer conductor post 50 a is greater than or equal to the aspect ratio R asp of the inner conductor bost 50 b.
- the build-up layer is deformed according to the deformation of the low elastic modulus layer 40 while maintaining the electrical connection with the conductor pattern 32 on the upper surface.
- the stress applied to the outer peripheral portion of the IC chip 70 or the solder bump 66 near the outer periphery is surely alleviated.
- These parts can be prevented from being destroyed by thermal expansion and contraction.
- the rate of change in electrical resistance when heating and cooling are repeated can be kept small, and power can be stably supplied to the mounted IC chip 70.
- the conductor bore 50 has a diameter exceeding 30 ⁇ , the electric resistance of the conductor post 50 is low, and the IC is not mounted even if an IC chip 70 with an operating clock of 3 G ⁇ or more is mounted.
- the transistors in chip 70 do not run out of power. More on these effects later This has been demonstrated as described in the experimental examples described below.
- the aspect ratio R asp of the outer conductor boss 50a is not less than 1.25 times and not more than 2 times the aspect ratio R asp of the inner conductor boss 50b, the above-described effects are remarkable. . Furthermore, since the outer conductor post 50a and the inner conductor post 5Ob are formed in a shape having cracks, the electric resistance when heating and cooling are repeated as compared to the substantially straight conductor post. The rate of change of can be further suppressed. Further, the range of the conductor post 50 from the outer circumference to the 10th row (that is, up to 2Z3 of the whole (15 rows)) is defined as the outer conductor post 50a.
- the application of the present invention is significant. Furthermore, since the top of the conductor bost 50 formed to be flush with the upper surface of the low elastic modulus layer 40 is used as the land 52, a land is formed separately from the conductor bost 50. It can be easily manufactured as compared with the case. In addition, since the low elastic modulus layer 40 has a Young's modulus at 30 ° C. of 10 MPa to 1 GPa, stress caused by a difference in thermal expansion coefficient can be more reliably reduced.
- the shape of the conductor posts 50 is a shape having a crack, but may be a substantially straight columnar shape, or only the outer conductor posts 50a may have a crack.
- the inner conductor boss 50b may have a cracked shape.
- the aspect ratio R asp of the outer conductor post 50 a and the inner conductor post 50 b is more than 4 and the diameter exceeds 30 m, and the aspect ratio of the outer conductor post 50 a is larger.
- Ratio R asp is the conductor ratio of inner conductor boss 50 b. JP2005 / 008567
- FIG. 7 is an explanatory view showing an example of a manufacturing procedure in a case where both the conductor posts 50a and 50b have a substantially straight shape.
- a core substrate 20 on which a build-up layer 30 was formed was prepared (see FIG. 7A).
- a commercially available dry film 303 two layers of CX_A240 made by Asahi Kasei Corporation, a total thickness of 240 / m) was adhered, and the substrate was irradiated with a carbon dioxide gas laser.
- a small-diameter hole 308a (e.g., ⁇ 33 / m) was formed on the outer periphery, and a large-diameter hole 308b (e.g., ⁇ 50 ⁇ ) was formed on the inner periphery of the substrate (Fig. 7). (b)). Subsequently, for the substrate in the course of the fabrication, electrolytic copper plating was performed from the bottom of each hole 3 08 a, 3 08 b to form a hole 3 0 8 in the columnar copper layer 3 10 a, 3 10 b. a, 308b were filled, and solder layers 312, 322 were formed on the upper surfaces of the copper layers 310a, 310b (see FIG. 7 (c)).
- the substrate being manufactured is immersed in an ammonia etching solution and etched to expose the surface of the electroless copper plating layer 304 to the surface.
- the part that has been removed has been removed (see Fig. 7 (d)).
- the solder layers 312 and 3222 functioned as an etching resist.
- the copper layers 310a and 310b could be made substantially straight. In the case of a substantially straight shape as described above, it is effective to use a slit nozzle that can spray the etching solution in a straight line.
- the upper surface of the resin insulating layer 36 becomes the conductor plate 32, and the through-hole portion becomes the via hole 34. became.
- the epoxy resin and urethane resin Is adhered, and cured at 150 ° C for 60 minutes to form a resin layer 3 16, and then the surfaces of the copper layers 3 10 a and 3 10 b
- the resin layer 316 was polished until it was exposed (see Fig. 7 (e)).
- the copper layer 310a became the outer conductor post 50a
- the copper layer 310b became the inner conductor post 5 Ob
- the resin layer became the low elastic modulus layer 40.
- the tops of both conductor boasts 50a and 50b exposed from the low elastic modulus layer 40 became lands 52. Thereafter, a solder bump may be formed on the land 52 in the same manner as in the above-described embodiment.
- the multilayer printed wiring board obtained in this manner can also obtain substantially the same effects as those of the above-described embodiment.
- a solder resist layer may be formed on the low elastic modulus layer 40 of the above-described embodiment.
- an opening is provided in the solder resist layer so that the land 52 is exposed to the outside.
- solder resist layer can be formed by an ordinary method.
- only one low elastic modulus layer 40 having a conductor boss 50 is formed on the pilled-up layer 30.
- a plurality of layers may be stacked.
- the land 52 is formed on the top of the conductor post 50, that is, a part of the conductor post 50.
- a land separate from the conductor post 50 may be formed on the top of the conductor post 50.
- the low elastic modulus layer 40 is formed so as to substantially coincide with the entire projected portion when the IC chip 70 is virtually projected on the low elastic modulus layer 40 side. You may.
- the low elastic modulus layer 40 may be formed over the entire area of the build-up layer 30 beyond the entire area of the projected portion as shown in FIG. 1, but a sufficient effect can be obtained as long as it is substantially coincident with the entire area of the projected portion. Therefore, it may be formed so as to substantially coincide with the entire area of the projected portion in consideration of economy and the like.
- the multilayer printed wiring board 10 of the present embodiment First, the relationship between the conductor post aspect ratio R asp and the rate of change in electrical resistance after repeated heating and cooling is described.
- the multilayer printed wiring board provided with the conductor posts of Experimental Examples 1 to 23 shown in Table 1 (30 ⁇ 30 in the horizontal direction, that is, multiplexed from the outermost circumference to the 15th column) was described above. It was produced according to the embodiment.
- the multilayer printed wiring boards of Experimental Examples 1 to 12 have conductor bosts having the same minimum diameter and maximum diameter, that is, substantially straight pillar-shaped conductor boasts. It was produced according to the production procedure.
- the multilayer printed wiring boards of Experimental Examples 13 to 23 have conductor bores having different minimum and maximum diameters, that is, conductor bores having a shape with cracks, and these are used in the manufacturing procedure of FIGS. 4 to 6. It was prepared according to. An IC chip having a porous interlayer insulating film is mounted on the multilayer printed wiring board of each experimental example obtained in this manner, and then a sealing resin is filled between the IC chip and the multilayer printed wiring board. This was used as an IC mounting board.
- the electric resistance of the specific circuit via the IC chip (the electric resistance between the pair of electrodes that are exposed on the surface of the IC mounting board opposite to the IC chip mounting surface and communicates with the IC chip) is measured, and The value was set as the initial value. After that, a heat cycle test was performed on those IC-mounted substrates, in which the cycle was set at ⁇ 55 ° C. for 5 minutes and 125 ° C. for 5 minutes as one cycle, and this cycle was repeated for 2000 cycles.
- the rate of change in electrical resistance is small, it means that damage to the outer periphery of the IC chip and the solder bumps near the outer circumference is small, and power can be supplied stably to the IC chip. This means that the outer periphery of the chip and the solder bumps near the outer periphery are destroyed and are severely damaged, which means that stable power supply to the IC chip is not possible.
- the target tag has a change rate of less than 10% in soil at the 100th cycle (that is,
- both the outer conductor boss and the inner conductor boss have an aspect ratio R asp of 4 or more and a diameter exceeding 30 xm, and the outer conductor boss has an aspect ratio R asp of more than 30 xm.
- the aspect ratio of the inner conductor boss is Rasp or more (Experimental examples 2 to 4, 6 to 10, 14 to 16, 18 to 20, and 23)
- the evaluation was “good” or more until the 100th cycle, those that did not satisfy this condition (Experimental Examples 1, 5, 11 to 13 to 17, 17 and 21) were: In each case, the evaluation was “poor” at any stage up to the 100th cycle.
- the total number of rows from the outermost circumference of the conductor posts X 2 Z The position beyond the third row (the conductors inside the second and third rows) Since it is not necessary to relieve the stress in the post), it is preferable to set the outer conductor posts within the range from the outermost circumference to the total number of rows X 2 Z to the third row. It is preferable to set the outer conductor bost within the range up to the second Z 5th column.
- the present invention is based on Japanese Patent Application No. 2004-134334, filed April 28, 2004, the entire contents of which are incorporated. You. Industrial potential
- the multilayer printed wiring board of the present invention is used in various industries that use equipment mounted on the wiring board, for example, in the fields of the electric equipment industry, the communication equipment industry, the automobile industry, and the like.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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EP05738530A EP1705972A4 (en) | 2004-04-28 | 2005-04-28 | MULTILAYER CONDUCTOR PLATE |
JP2006512878A JP4504975B2 (ja) | 2004-04-28 | 2005-04-28 | 多層プリント配線板 |
US11/443,046 US7262975B2 (en) | 2004-04-28 | 2006-05-31 | Multilayer printed wiring board |
US11/778,989 US7489521B2 (en) | 2004-04-28 | 2007-07-17 | Multilayer printed wiring board |
US12/331,054 US7881071B2 (en) | 2004-04-28 | 2008-12-09 | Multilayer printed wiring board |
US12/984,644 US8169792B2 (en) | 2004-04-28 | 2011-01-05 | Multilayer printed wiring board |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004134370 | 2004-04-28 | ||
JP2004-134370 | 2004-04-28 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/443,046 Continuation US7262975B2 (en) | 2004-04-28 | 2006-05-31 | Multilayer printed wiring board |
Publications (1)
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WO2005107350A1 true WO2005107350A1 (ja) | 2005-11-10 |
Family
ID=35242085
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/008567 WO2005107350A1 (ja) | 2004-04-28 | 2005-04-28 | 多層プリント配線板 |
Country Status (6)
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US (4) | US7262975B2 (ja) |
EP (1) | EP1705972A4 (ja) |
JP (1) | JP4504975B2 (ja) |
KR (1) | KR100827266B1 (ja) |
CN (1) | CN100544558C (ja) |
WO (1) | WO2005107350A1 (ja) |
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- 2005-04-28 EP EP05738530A patent/EP1705972A4/en not_active Withdrawn
- 2005-04-28 KR KR1020067011698A patent/KR100827266B1/ko not_active IP Right Cessation
- 2005-04-28 JP JP2006512878A patent/JP4504975B2/ja not_active Expired - Fee Related
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2006
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2007
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2008
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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KR100978774B1 (ko) * | 2005-12-27 | 2010-08-30 | 이비덴 가부시키가이샤 | 다층 프린트 배선판 |
JP2007234841A (ja) * | 2006-02-28 | 2007-09-13 | Kyocera Corp | 配線基板、実装部品、電子装置、配線基板の製造方法および電子装置の製造方法 |
JP2008004660A (ja) * | 2006-06-21 | 2008-01-10 | Tanaka Kikinzoku Kogyo Kk | ブラインドホールカット配線板およびその製造方法 |
JP2009224731A (ja) * | 2008-03-18 | 2009-10-01 | Ngk Spark Plug Co Ltd | 多層樹脂配線基板 |
WO2015125928A1 (ja) * | 2014-02-21 | 2015-08-27 | 三井金属鉱業株式会社 | 内蔵キャパシタ層形成用銅張積層板、多層プリント配線板及び多層プリント配線板の製造方法 |
US9924597B2 (en) | 2014-02-21 | 2018-03-20 | Mitsui Mining & Smelting Co., Ltd. | Copper clad laminate for forming of embedded capacitor layer, multilayered printed wiring board, and manufacturing method of multilayered printed wiring board |
US10524360B2 (en) | 2014-02-21 | 2019-12-31 | Mitsui Mining & Smelting Co., Ltd. | Copper clad laminate for forming of embedded capacitor layer, multilayered printed wiring board, and manufacturing method of multilayered printed wiring board |
Also Published As
Publication number | Publication date |
---|---|
EP1705972A4 (en) | 2010-05-19 |
US20060231290A1 (en) | 2006-10-19 |
KR100827266B1 (ko) | 2008-05-07 |
EP1705972A1 (en) | 2006-09-27 |
US7262975B2 (en) | 2007-08-28 |
US7489521B2 (en) | 2009-02-10 |
US20070295532A1 (en) | 2007-12-27 |
CN100544558C (zh) | 2009-09-23 |
US20110100700A1 (en) | 2011-05-05 |
US7881071B2 (en) | 2011-02-01 |
US8169792B2 (en) | 2012-05-01 |
KR20060105774A (ko) | 2006-10-11 |
JP4504975B2 (ja) | 2010-07-14 |
CN1914966A (zh) | 2007-02-14 |
JPWO2005107350A1 (ja) | 2008-03-21 |
US20090090547A1 (en) | 2009-04-09 |
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