WO2010021328A1 - プリント配線板 - Google Patents
プリント配線板 Download PDFInfo
- Publication number
- WO2010021328A1 WO2010021328A1 PCT/JP2009/064463 JP2009064463W WO2010021328A1 WO 2010021328 A1 WO2010021328 A1 WO 2010021328A1 JP 2009064463 W JP2009064463 W JP 2009064463W WO 2010021328 A1 WO2010021328 A1 WO 2010021328A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- wiring board
- printed wiring
- resistor
- conductor layer
- Prior art date
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Classifications
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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
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
- H05K1/023—Reduction of cross-talk, noise or electromagnetic interference using auxiliary mounted passive components or auxiliary substances
- H05K1/0234—Resistors or by disposing resistive or lossy substances in or near power planes
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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
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
- H05K1/0218—Reduction of cross-talk, noise or electromagnetic interference by printed shielding conductors, ground planes or power plane
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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
- H05K1/16—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor
- H05K1/167—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor incorporating printed resistors
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/02—Fillers; Particles; Fibers; Reinforcement materials
- H05K2201/0203—Fillers and particles
- H05K2201/0206—Materials
- H05K2201/0209—Inorganic, non-metallic particles
-
- 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
- H05K2201/20—Details of printed circuits not provided for in H05K2201/01 - H05K2201/10
- H05K2201/2036—Permanent spacer or stand-off in a printed circuit or printed circuit assembly
-
- 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
- H05K3/22—Secondary treatment of printed circuits
- H05K3/28—Applying non-metallic protective coatings
- H05K3/281—Applying non-metallic protective coatings by means of a preformed insulating foil
-
- 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
- H05K3/38—Improvement of the adhesion between the insulating substrate and the metal
- H05K3/386—Improvement of the adhesion between the insulating substrate and the metal by the use of an organic polymeric bonding layer, e.g. adhesive
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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
- H05K3/4644—Manufacturing multilayer circuits by building the multilayer layer by layer, i.e. build-up multilayer circuits
- H05K3/4652—Adding a circuit layer by laminating a metal foil or a preformed metal foil pattern
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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
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24273—Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture
- Y10T428/24322—Composite web or sheet
- Y10T428/24331—Composite web or sheet including nonapertured component
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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
- 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
-
- 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
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31678—Of metal
-
- 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
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31935—Ester, halide or nitrile of addition polymer
Definitions
- the present invention relates to a printed wiring board with a conduction noise suppression function.
- MPUs microprocessor units
- An undercoat layer, a shield layer coated with a conductive paste containing metal powder, and an overcoat layer are sequentially provided on the copper foil wiring circuit on the surface of the heat-resistant plastic film, and the ground pattern and the shield layer of the copper foil wiring circuit are provided.
- a flexible printed wiring board that penetrates and is electrically connected to an undercoat layer at an appropriate interval Patent Document 1.
- An insulating layer is provided that insulates an electromagnetic wave shielding film in which a metal thin film layer and a conductive adhesive layer containing a metal filler are sequentially provided on one side of the coverlay film except for a part of the ground circuit in the printed circuit.
- a flexible printed wiring board (Patent Document 2) placed on a base film so that a conductive adhesive layer adheres to an insulating layer and a part of a ground circuit.
- the flexible printed wiring boards (1) and (2) have an electromagnetic shielding function, they cannot suppress conduction noise conducted through the conductor layer of the flexible printed wiring board.
- the present invention provides a printed wiring board having a conduction noise suppressing function.
- a printed wiring board body in which a conductor layer is formed on the surface of a substrate, and a coverlay film in which a resistor layer is formed on the surface of the coverlay film body are arranged via an adhesive layer.
- the printed wiring board is bonded, and the resistor layer is disposed to be opposed to the conductor layer with the adhesive layer interposed therebetween.
- the resistor layer is oppositely developed in the vicinity of the edge portion of the conductor layer.
- the resistor layer is preferably provided along the surface shape of the printed wiring board body. It is preferable that the resistor layer is not exposed to the outside of the printed wiring board.
- the adhesive layer preferably includes an insulating powder.
- the printed wiring board body is preferably a flexible printed wiring board body in which a conductor layer is formed on the surface of a polymer film.
- the printed wiring board of the present invention can suppress conduction noise conducted through the conductor layer.
- facing means a state in which at least a part thereof overlaps when viewed from above.
- FIG. 1 is a cross-sectional view showing an example of a printed wiring board according to the present invention.
- the printed wiring board 10 includes a printed wiring board main body 20 in which a conductor layer (a power supply layer 24 and a signal transmission layer 26) is formed on one surface of a substrate 22, and a conductor layer (a ground layer 28) is formed on the other surface.
- the cover lay film 30 in which the resistor layer 34 is formed on one surface of the cover lay film main body 32 is bonded through the adhesive layer 40.
- the printed wiring board body 20 is obtained by processing a copper foil of a copper-clad laminate into a desired pattern by a known etching method.
- the copper-clad laminate include a three-layer structure in which a copper foil is bonded to the substrate 22 with an adhesive; a two-layer structure in which a resin solution or the like that forms the substrate 22 is cast on the copper foil.
- the material of the substrate 22 examples include glass fiber reinforced epoxy resin, epoxy resin, polyester, PET (polyethylene terephthalate), PEN (polyethylene naphthalate), PC (polycarbonate), polyvinylidene, polyimide, polyphenylene sulfide, liquid crystal polymer, polystyrene, and the like. Can be mentioned.
- the substrate 22 is preferably a polymer film.
- the surface resistance of the polymer film is preferably 1 ⁇ 10 6 ⁇ or more.
- a polymer film the film which has heat resistance is preferable, and a polyimide film, a liquid crystal polymer film, etc. are more preferable.
- the thickness of the polymer film is preferably 5 to 50 ⁇ m, more preferably 6 to 25 ⁇ m from the viewpoint of flexibility, and particularly preferably 10 to 25 ⁇ m.
- Conductor layer As copper foil which comprises a conductor layer, rolled copper foil, electrolytic copper foil, etc. are mentioned, From a flexible point, rolled copper foil is preferable.
- the thickness of the copper foil (conductor layer) is preferably 18 to 35 ⁇ m. End portions (terminals) in the length direction of the conductor layer are not covered with the coverlay film 30 for solder connection, connector connection, component mounting, and the like.
- the coverlay film body 32 is a polymer film.
- the surface resistance of the coverlay film main body 32 is preferably 1 ⁇ 10 6 ⁇ or more.
- Examples of the material of the coverlay film main body 32 include polyimide, liquid crystal polymer, polyaramid, polyphenylene sulfide, polyamideimide, polyetherimide, polyethylene naphthalate, and polyethylene terephthalate.
- the thickness of the coverlay film main body 32 is preferably 3 to 25 ⁇ m from the viewpoint of flexibility, and particularly preferably 3 to 10 ⁇ m from the viewpoint of high followability to the surface shape.
- the resistor layer 34 is separated from the conductor layer (the power supply layer 24 or the ground layer 28) via the adhesive layer 40, and is disposed in the vicinity of the conductor layer along the conductor layer. Is not connected. Note that the resistor layer 34 may deteriorate the high-speed pulse signal of the signal transmission layer 26 in order to suppress high-frequency components. Therefore, it is preferable that the power supply layer 24 or the ground layer 28 exists between the signal transmission layer 26 and the resistor layer 34.
- the resistor layer 34 is developed in the vicinity of the edge portion 29 of the conductor layer.
- the resistor layer 34 conforms to the surface shape of the conductor layer (that is, to the surface shape of the printed wiring board body 20). Preferably).
- the gap between the resistor layer 34 and the conductor layer (that is, the thickness of the adhesive layer 40) is preferably narrow.
- the gap between the resistor layer 34 and the conductor layer is preferably 1 to 100 ⁇ m.
- the gap between the resistor layer 34 and the conductor layer is less than 1 ⁇ m, there is a possibility that an insulation failure between the resistor layer 34 and the conductor layer occurs.
- the gap between the resistor layer 34 and the conductor layer exceeds 100 ⁇ m, the conductive noise suppression effect is reduced and the printed wiring board 10 is thickened.
- the effective area of the resistor layer 34 that receives the magnetic flux generated from the edge portion 29 of the conductor layer is large.
- the effective area of the resistor layer 34 can be represented by the product of the width d of the resistor layer 34 not facing the conductor layer and the length of the resistor layer 34. Therefore, the width of the resistor layer 34 is preferably wider than the width of the conductor layer.
- the width d is preferably 0.1 mm or more, more preferably 0.5 mm or more, and further preferably 1.0 mm or more. If the width d is 0.1 mm or more, the magnetic flux can be received sufficiently and eddy current can be generated sufficiently.
- the upper limit of the width d is determined according to the size of the printed wiring board 10. As the frequency of the conduction noise becomes higher than 1 GHz, the conduction noise tends to concentrate on the edge portion 29. Therefore, even if the width d is small, the conduction noise can be efficiently suppressed.
- the resistor layer 34 is not exposed to the outside of the printed wiring board 10. If the resistor layer 34 is exposed to the outside from the side surface or the like of the printed wiring board 10, problems such as deterioration of the resistor layer 34 and migration of the material constituting the resistor layer 34 may occur.
- the surface resistance of the resistor layer 34 is preferably 5 to 500 ⁇ .
- the surface resistance of the resistor layer 34 is less than 5 ⁇ , it is difficult to obtain a sufficient resistance loss even if an eddy current is generated, and the effect of suppressing conduction noise is reduced. If the surface resistance of the resistor layer 34 exceeds 500 ⁇ , eddy currents are less likely to occur and it is difficult to efficiently suppress conduction noise.
- Examples of the material of the resistor layer 34 include metals, conductive ceramics, and carbon materials. When the specific resistance of the material is low, the surface resistance can be adjusted to be high by reducing the thickness of the resistor layer 34. However, since it is difficult to control the thickness, the material of the resistor layer 34 is a relatively high specific resistance. A material having is preferred.
- the metal examples include a ferromagnetic metal and a paramagnetic metal.
- Ferromagnetic metals include iron, carbonyl iron, iron alloys (Fe—Ni, Fe—Co, Fe—Cr, Fe—Si, Fe—Al, Fe—Cr—Si, Fe—Cr—Al, Fe—Al—). Si, Fe—Pt, etc.), cobalt, nickel, and alloys thereof.
- the paramagnetic metal include gold, silver, copper, tin, lead, tungsten, silicon, aluminum, titanium, chromium, tantalum, molybdenum, alloys thereof, amorphous alloys, and alloys with ferromagnetic metals.
- nickel, iron-chromium alloy, tungsten, chromium, and tantalum are preferable from the viewpoint of resistance to oxidation. Practically, nickel, nickel-chromium alloy, iron-chromium alloy, tungsten, chromium, and tantalum are used. More preferred is nickel or a nickel alloy.
- the conductive ceramic examples include an alloy, an intermetallic compound, a solid solution, and the like including a metal and one or more elements selected from the group consisting of boron, carbon, nitrogen, silicon, phosphorus, and sulfur.
- nickel nitride, titanium nitride, tantalum nitride, chromium nitride, titanium carbide, silicon carbide, chromium carbide, vanadium carbide, zirconium carbide, molybdenum carbide, tungsten carbide, chromium boride, molybdenum boride, chromium silicide examples thereof include zirconium silicide.
- the conductive ceramic can be easily obtained by using a gas containing one or more elements selected from the group consisting of nitrogen, carbon, silicon, boron, phosphorus, and sulfur as a reactive gas in the physical vapor deposition method.
- a gas containing one or more elements selected from the group consisting of nitrogen, carbon, silicon, boron, phosphorus, and sulfur as a reactive gas in the physical vapor deposition method.
- the carbon material include amorphous carbon, graphite, DLC (diamond-like carbon), and the like.
- the resistor layer 34 is formed by, for example, forming a resistor vapor deposition film formed on the surface of the cover lay film main body 32 by physical vapor deposition (EB vapor deposition, ion beam vapor deposition, sputtering, etc.) using a known wet method. It is formed by processing into a desired pattern by (wet etching method), dry method (plasma etching method, laser ablation method) or the like.
- the thickness of the resistor layer 34 is preferably 5 to 50 nm from the viewpoint of flexibility.
- the adhesive layer 40 is obtained by curing or solidifying a commercially available adhesive sheet (bonding sheet).
- a wet adhesive is applied to the coverlay film body and dried to form an adhesive layer as in a conventional coverlay film manufacturing method, (i) a coverlay film having a patterned resistor layer is formed.
- problems such as curling and subsequent alignment being difficult, (ii) patterning dimensions are changed by heating, and alignment accuracy is lowered, and (iii) resistance layer is promoted to deteriorate.
- the printed wiring board body and the lamination press can be immediately performed, and the bonding is very simple. Processing can be performed.
- the material for the adhesive sheet examples include B-stage (semi-cured) epoxy resin, thermoplastic polyimide, and the like.
- the epoxy resin may contain a rubber component (carboxyl-modified nitrile rubber or the like) for imparting flexibility.
- the adhesive sheet may be formed on a releasable film or the like by casting the material so as to have a desired thickness, and then the releasable film or the like may be peeled to form a continuous sheet. Further, it may be stored with a releasable film or a protective film.
- the adhesive layer 40 preferably includes an insulating powder as a spacer in order to enhance the insulation between the resistor layer 34 and the conductor layer.
- the powder may have other functions such as fluidity adjustment and flame retardancy.
- Insulating powders include magnesium hydroxide, aluminum hydroxide, antimony oxide, zinc stannate, zinc borate, silicon oxide, titanium oxide, zeolite, fibrous powder (calcium carbonate whisker, zinc oxide whisker, boron Acid aluminum whisker, potassium titanate whisker, etc.).
- the diameter of the insulating powder is preferably 1/2 to 1/20 of the thickness of the adhesive layer. If it is smaller than this, the function of the insulating spacer cannot be achieved, and if it is larger than this, there is a possibility of causing adhesion inhibition.
- the blending amount of the insulating powder is approximately 1 to 30 parts by mass in 100 parts by mass of the adhesive layer. If it is less than this, sufficient insulation cannot be obtained, and if it is more than this, adhesion is inhibited, and a problem arises in the followability of the surface shape.
- the thickness of the adhesive layer 40 is preferably 1 to 100 ⁇ m. Further, in order to provide the resistor layer 34 along the surface shape of the printed wiring board body 20, the thickness of the adhesive layer 40 is preferably thinner than the thickness of the conductor layer. The wetting to the resistor layer 34 is due to the melting of the adhesive layer 40.
- the adhesive layer 40 has a higher viscosity than the adhesive containing the solvent and does not wet well. As an adhesion promoter, it is preferable to apply an adhesion promoter such as a silane coupling agent or a titanate coupling agent.
- Silane coupling agents include vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, 3-methacryloxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, and 2- (3,4-epoxycyclohexyl).
- Ethyltrimethoxysilane N-2- (aminoethyl) 3-aminopropyltrimethoxysilane, N-2- (aminoethyl) 3-aminopropylmethyldimethoxysilane, 3-aminopropyltriethoxysilane, N-phenyl- Examples include 3-aminopropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, and 3-chloropropyltrimethoxysilane.
- Titanate coupling agents include isopropyl triisostearoyl titanate, isopropyl tris (dioctyl pyrophosphate) titanate, isopropyl tri (N-aminoethyl-aminoethyl) titanate, tetraoctyl bis (di-tridecyl phosphite) titanate, bis (Dioctylpyrophosphate) oxyacetate titanate, bis (dioctylpyrophosphate) ethylene titanate, isopropyltrioctanoyl titanate, isopropyldimethacrylisostearoyl titanate, isopropylisostearoyldiacryl titanate, tetraisopropylbis (dioctylphosphite) titanate It is done.
- the resistor layer 34 is disposed opposite to the conductor layer (the power supply layer 24 or the ground layer 28) with the adhesive layer 40 interposed therebetween. Conductive noise conducted through the conductor layer can be suppressed.
- electromagnetic wave noise is radiated from the conductor layer and an electromagnetic field fluctuation occurs around the conductor layer, that is, a change in the magnetic flux density generated from the conductor layer
- the resistor layer 34 disposed so as to face the change in the magnetic flux density is prevented. It is considered that eddy current is generated inside, energy is consumed due to resistance loss, and conduction noise flowing through the conductor layer is attenuated.
- the printed wiring board 10 is manufactured through the following steps (a) to (c), for example.
- (A) A step of partially adhering (temporarily fixing) the adhesive sheet to the surface of the cover lay film 30 on which the resistor layer 34 is formed.
- (B) If necessary, a portion corresponding to the end portion is punched out from the coverlay film 30 and the adhesive sheet so that the end portion in the length direction of the conductor layer of the printed wiring board body 20 is exposed. Forming.
- An adhesive agent between the printed wiring board main body 20 and the cover lay film 30 is provided on the surface of the printed wiring board main body 20 on which the conductor layer is formed. A process of stacking sheets so that they are positioned and integrating them by pressing.
- the temporary fixing of the adhesive sheet to the cover lay film 30 is performed by partially adhering so that a gap where the cover lay film and the adhesive sheet are not bonded is formed and the gap communicates with the outside. Is preferred.
- the deaeration at the time of pressing in the step (c) becomes good, and bubbles are generated at the interface between the cover lay film 30 and the adhesive layer 40. Is suppressed.
- Temporary fixing of the adhesive sheet to the cover lay film 30 is performed, for example, by adhering the cover lay film 30 and the adhesive layer 40 to a blank portion outside the product range in a dot shape or the entire surface in a dot shape. .
- alignment is performed so that the resistor layer 34 and the conductor layer are arranged to face each other.
- a hole is formed based on a mark formed by a laser at the time of patterning of the resistor layer, and a positioning needle is passed through the hole, or a transmission sensor using LED light or X-rays or
- the method of aligning the position by directly reading the mark with a reflection sensor can be mentioned, the latter method is a direct method and is preferable because of high accuracy.
- a conductor having a line width of 0.5 mm and a line length of 110 mm is formed on one surface of a double-sided copper-clad laminate (200 mm ⁇ 200 mm) made of a polyimide film having a thickness of 25 ⁇ m and a rolled copper foil having a thickness of 18 ⁇ m by an etching method.
- a layer (signal layer) was formed.
- land portions of 3 mm ⁇ were formed so that SMA connectors could be attached, and the substantial line length was 100 mm.
- a conductor layer (ground layer) of 55 mm ⁇ 110 mm was formed on the other surface of the double-sided copper-clad laminate by etching, and a through hole was formed in the land portion to produce a printed wiring board body (A). .
- Nickel is physically vapor-deposited on the surface of a polyimide film having a size of 60 mm ⁇ 120 mm ⁇ thickness 10 ⁇ m by a magnetron sputtering method under nitrogen gas flow, and a nickel nitride deposited film having a thickness of 58 mm ⁇ 118 mm ⁇ thickness 25 nm (surface resistance: 25 ⁇ ) Formed.
- the deposited film was processed by a laser ablation method to form a resistor layer having a line width of 1.5 mm and a line length of 90 mm, and a coverlay film (B1) was produced.
- a nickel-chromium alloy (60 mass% nickel) is physically vapor-deposited on the surface of a polyimide film having a size of 60 mm ⁇ 120 mm ⁇ thickness 10 ⁇ m by a magnetron sputtering method, and a nickel-chromium alloy vapor deposition film having a size of 58 mm ⁇ 118 mm ⁇ thickness 13 nm. (Surface resistance: 100 ⁇ ) was formed to produce a coverlay film (B2).
- a bonding sheet of 60 mm ⁇ 120 mm ⁇ 20 ⁇ m in thickness consisting of an epoxy resin containing a rubber component and a latent curing agent
- An epoxy adhesive film is formed and dried to form a B-stage, 5 parts by mass of silica particles having an average particle diameter of 5 ⁇ m as an insulating powder in 100 parts by mass of the bonding sheet, an average fiber diameter of 1 ⁇ m, and an average fiber length of 20 ⁇ m 3 parts by weight of calcium carbonate) was partially heated and bonded.
- a window portion that avoids the land portion is formed by punching so that the SMA connector can be connected.
- Coverlay film (B1) having a bonding sheet temporarily fixed on the surface of the printed wiring board body (A) on which the conductor layer (signal layer) is formed is connected to the printed wiring board body (A) and the coverlay film ( B1) and the resistor layer and the conductor layer (excluding the land portion) are disposed so as to face each other so that the bonding sheet is located between them. Further, a coverlay film (B2) having a bonding sheet temporarily fixed on the surface of the printed wiring board body (A) on which the conductor layer (ground layer) is formed is attached to the printed wiring board body (A) and the coverlay. The bonding sheets were stacked so as to be positioned between the film (B2).
- the resistor layer is provided so as to follow the surface shape of the printed wiring board main body (A), and as a result, the resistor layer is developed in the vicinity of the edge portion of the conductor layer. . Further, the resistor layer disposed opposite to the conductor layer was completely covered with the coverlay film (B1) and was not exposed to the outside of the printed wiring board. Further, the width d of the resistor layer not facing the conductor layer (signal layer) was 0.5 mm.
- S21 parameter was evaluated. However, the value of the printed wiring board body measured separately was canceled and corrected. The results are shown in FIG.
- Example 1 A printed wiring board was produced in the same manner as in Example 1 except that the resistor layer was not provided, and evaluated in the same manner as in Example 1. The results are shown in FIG.
- the printed wiring board of the present invention is useful as a flexible printed wiring board for small electronic devices such as optical modules, mobile phones, digital cameras, and game machines.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Structure Of Printed Boards (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Parts Printed On Printed Circuit Boards (AREA)
- Non-Metallic Protective Coatings For Printed Circuits (AREA)
Abstract
Description
本願は、2008年8月19日に、日本に出願された特願2008-211100号に基づき優先権を主張し、その内容をここに援用する。
(1)耐熱プラスチックフィルム表面の銅箔配線回路上に、アンダーコート層、金属粉を含む導電ペーストを塗布したシールド層、オーバーコート層を順次設け、銅箔配線回路のグランドパターンとシールド層とが適宜の間隔でアンダーコート層を貫通して電気的に接続しているフレキシブルプリント配線板(特許文献1)。
(2)カバーレイフィルムの片面に金属薄膜層と金属フィラーを含む導電性接着剤層とを順次設けた電磁波シールドフィルムを、プリント回路のうちグランド回路の一部を除いて絶縁する絶縁層が設けられた基体フィルム上に、導電性接着剤層が絶縁層およびグランド回路の一部と接着するように載置したフレキシブルプリント配線板(特許文献2)。
前記抵抗体層は、前記プリント配線板本体の表面形状に沿うように設けられていることが好ましい。
前記抵抗体層は、前記プリント配線板の外部に露出していないことが好ましい。
前記接着剤層は、絶縁性粉体を含むことが好ましい。
前記プリント配線板本体は、ポリマーフィルムの表面に導体層が形成されたフレキシブルプリント配線板本体であることが好ましい。
図1は、本発明のプリント配線板の一例を示す断面図である。プリント配線板10は、基板22の一方の表面に導体層(電源層24および信号伝送層26)が形成され、他方の表面に導体層(グランド層28)が形成されたプリント配線板本体20と、カバーレイフィルム本体32の片面に抵抗体層34が形成されたカバーレイフィルム30とが、接着剤層40を介して貼り合わされたものである。
プリント配線板本体20は、銅張積層板の銅箔を公知のエッチング法により所望のパターンに加工して導体層としたものである。
銅張積層板としては、基板22に銅箔を接着剤で貼り合わせた3層構造のもの;銅箔上に基板22を形成する樹脂溶液等をキャストした2層構造のもの等が挙げられる。
基板22の材料としては、ガラス繊維強化エポキシ樹脂、エポキシ樹脂、ポリエステル、PET(ポリエチレンテレフタレート)、PEN(ポリエチレンナフタレート)、PC(ポリカーボネート)、ポリビニリデン、ポリイミド、ポリフェニレンサルファイド、液晶ポリマー、ポリスチレン等が挙げられる。
プリント配線板10がフレキシブルプリント配線板の場合、基板22としては、ポリマーフィルムが好ましい。
ポリマーフィルムとしては、耐熱性を有するフィルムが好ましく、ポリイミドフィルム、液晶ポリマーフィルム等がより好ましい。
ポリマーフィルムの厚さは、5~50μmが好ましく、屈曲性の点から、6~25μmがより好ましく、10~25μmが特に好ましい。
導体層を構成する銅箔としては、圧延銅箔、電解銅箔等が挙げられ、屈曲性の点から、圧延銅箔が好ましい。
銅箔(導体層)の厚さは、18~35μmが好ましい。
導体層の長さ方向の端部(端子)は、ハンダ接続、コネクター接続、部品搭載等のため、カバーレイフィルム30に覆われていない。
カバーレイフィルム本体32は、ポリマーフィルムである。
カバーレイフィルム本体32の表面抵抗は、1×106Ω以上が好ましい。
カバーレイフィルム本体32の材料としては、ポリイミド、液晶ポリマー、ポリアラミド、ポリフェニレンサルファイド、ポリアミドイミド、ポリエーテルイミド、ポリエチレンナフタレート、ポリエチレンテレフタレート等が挙げられる。
カバーレイフィルム本体32の厚さは、可とう性の点から、3~25μmが好ましく、表面形状への追従性が高くなる点から、3~10μmが特に好ましい。
抵抗体層34は、接着剤層40を介して導体層(電源層24またはグランド層28)と離間し、導体層に沿って導体層の近傍に対向配置されているが、導体層とは電気的に接続していない。なお、抵抗体層34は、高周波成分を抑制するため、信号伝送層26の高速パルス信号を劣化させてしまう恐れがある。よって、信号伝送層26と抵抗体層34との間には、電源層24またはグランド層28が存在することが好ましい。
また、抵抗体層34を導体層のエッジ部29の近傍に対向展開させるためには、抵抗体層34は、導体層の表面形状にコンフォーマルに(すなわち、プリント配線板本体20の表面形状に沿うように)設けられていることが好ましい。
材料の固有抵抗が低い場合は、抵抗体層34を薄くすることで、表面抵抗を高く調整できるが、厚さのコントロールが難しくなるため、抵抗体層34の材料としては、比較的高い固有抵抗を有する材料が好ましい。
強磁性金属としては、鉄、カルボニル鉄、鉄合金(Fe-Ni、Fe-Co、Fe-Cr、Fe-Si、Fe-Al、Fe-Cr-Si、Fe-Cr-Al、Fe-Al-Si、Fe-Pt等。)、コバルト、ニッケル、これらの合金等が挙げられる。
常磁性金属としては、金、銀、銅、錫、鉛、タングステン、ケイ素、アルミニウム、チタン、クロム、タンタル、モリブデン、それらの合金、アモルファス合金、強磁性金属との合金等が挙げられる。
金属としては、酸化に対して抵抗力のある点から、ニッケル、鉄クロム合金、タングステン、クロム、タンタルが好ましく、実用的には、ニッケル、ニッケルクロム合金、鉄クロム合金、タングステン、クロム、タンタルがより好ましく、ニッケルまたはニッケル合金が特に好ましい。
導電性セラミックスは、物理的蒸着法における反応性ガスとして、窒素、炭素、ケイ素、ホウ素、リンおよび硫黄からなる群から選ばれる1種以上の元素を含むガスを用いることによって容易に得られる。
炭素材料としては、アモルファスカーボン、グラファイト、DLC(ダイヤモンドライクカーボン)等が挙げられる。
抵抗体層34の厚さは、可とう性の点から、5~50nmが好ましい。
接着剤層40は、例えば、市販の接着剤シート(ボンディングシート)が硬化または固化したものである。従来のカバーレイフィルムの製法のように、カバーレイフィルム本体に湿式の接着剤を塗布、乾燥させて接着剤層を形成すると、(i)パターン状の抵抗体層が形成されたカバーレイフィルムがカールし、その後の位置あわせが困難になる、(ii)加熱によってパターニング寸法が変化してしまい位置あわせ精度が低下する、(iii)抵抗体層の劣化を促す、等の不具合がある。このような不具合を避けるためにも、ドライな接着剤シートを用いることが好ましく、さらに抵抗体層をエッチング加工した後、直ちにプリント配線板本体と積層プレスを行うことができ、非常に簡便に接着加工を行うことができる。
接着剤シートは、離型性フィルム等の上に、所望の厚みになるよう前記材料をキャスティングすることにより形成され、その後、離型性フィルム等を剥離して連続シート状にしてもよく、あるいは、離型性フィルムまたは保護フィルム付きで貯留してもよい。
このうちアスペクト比が3以上の粉体を用いることにより、接着剤層の流動により、効果的に導体層の稜部に配向し留まることが可能となるので好ましい。
絶縁性粉体の径は、接着剤層の厚みの1/2から1/20が好ましい。これより小さいと、絶縁性スペーサーの機能を果たせなくなり、これより大きいと接着阻害をもたらす恐れがある。
絶縁性粉体の配合量は、接着剤層100質量部中、おおよそ1~30質量部である。これより少ないと十分な絶縁性を出せず、多いと接着阻害をもたらすほか、表面形状の追従性に問題が生じて来る。
導体層から電磁波ノイズが放射され、導体層の周囲に電磁界変動、すなわち導体層から生じる磁束密度の変化が起きた際に、この磁束密度の変化を妨げるように対向配置された抵抗体層34中に渦電流が発生し、抵抗損によりエネルギーは消費され、導体層を流れる伝導ノイズは減衰していくものと考えられる。
プリント配線板10は、例えば、下記の工程(a)~(c)を経て製造される。
(a)カバーレイフィルム30の抵抗体層34が形成された側の表面に、接着剤シートを部分的に接着(仮止め)する工程。
(b)必要に応じて、プリント配線板本体20の導体層の長さ方向の端部が露出するように、カバーレイフィルム30および接着剤シートから前記端部に対応する部分を打ち抜いて窓部を形成する工程。
(c)プリント配線板本体20の導体層が形成された側の表面に、接着剤シートが仮止めされたカバーレイフィルム30を、プリント配線板本体20とカバーレイフィルム30との間に接着剤シートが位置するように重ね、これらをプレスによって一体化させる工程。
接着剤シートのカバーレイフィルム30への仮止めは、例えば、カバーレイフィルム30と接着剤層40とを製品範囲外の余白部分を点状に、あるいは全面を点状に接着することにより行われる。
透過型電子顕微鏡(日立製作所社製、H9000NAR)を用いてサンプルの断面を観察し、各層の5箇所の厚さを測定し、平均した。
石英ガラス上に金を蒸着して形成した、2本の薄膜金属電極(長さ10mm、幅5mm、電極間距離10mm)を用い、前記電極上に被測定物を置き、被測定物上から、被測定物の10mm×20mmの領域を50gの荷重で押し付け、1mA以下の測定電流で電極間の抵抗を測定し、この値を表面抵抗とした。
プリント配線板の導体層(信号層)の両端間のS21パラメータをネットワークアナライザー(アンリツ製、37247D)で評価し、伝導ノイズ抑制効果を確認した。
厚さ25μmのポリイミドフィルムと厚さ18μmの圧延銅箔とからなる両面銅張積層板(200mm×200mm)の一方の表面に、エッチング法にて線幅:0.5mm、線長:110mmの導体層(信号層)を形成した。導体層の両端は、SMAコネクターが取り付けられるように3mmΦのランド部分を形成し、実質的な線長は100mmとした。
前記両面銅張積層板の他方の表面に、エッチング法にて55mm×110mmの導体層(グランド層)を形成し、ランド部分に貫通孔を形成して、プリント配線板本体(A)を作製した。
前記プリント配線板について、ランド部分の貫通孔にSMAコネクターを通して両面の導体層を接続し、前記SMAコネクターとネットワークアナライザーとを接続した後、S21パラメータを評価した。ただし、別途測定したプリント配線板本体だけの値はキャンセルし、補正を行った。結果を図2に示す。
抵抗体層を設けない以外は、実施例1と同様にして、プリント配線板を作製し、実施例1と同様にして評価した。結果を図2に示す。
20 プリント配線板本体
22 基板
24 電源層(導体層)
26 信号伝送層
28 グランド層
29 エッジ部
30 カバーレイフィルム
32 カバーレイフィルム本体
34 抵抗体層
40 接着剤層
Claims (6)
- 基板の表面に導体層が形成されたプリント配線板本体と、カバーレイフィルム本体の表面に抵抗体層が形成されたカバーレイフィルムとが、接着剤層を介して貼り合わされたプリント配線板であり、
前記抵抗体層が、前記接着剤層を介して前記導体層と離間して対向配置されている、プリント配線板。 - 前記抵抗体層が、前記導体層のエッジ部の近傍に対向展開されている、請求項1に記載のプリント配線板。
- 前記抵抗体層が、前記プリント配線板本体の表面形状に沿うように設けられている、請求項1または2に記載のプリント配線板。
- 前記抵抗体層が、前記プリント配線板の外部に露出していない、請求項1~3のいずれかに記載のプリント配線板。
- 前記接着剤層が、絶縁性粉体を含む、請求項1~4のいずれかに記載のプリント配線板。
- 前記プリント配線板本体が、ポリマーフィルムの表面に導体層が形成されたフレキシブルプリント配線板本体である、請求項1~5のいずれかに記載のプリント配線板。
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CN2009801320377A CN102124821B (zh) | 2008-08-19 | 2009-08-18 | 印刷配线板 |
KR1020117006140A KR101197441B1 (ko) | 2008-08-19 | 2009-08-18 | 프린트 배선판 |
US13/059,497 US8507801B2 (en) | 2008-08-19 | 2009-08-18 | Printed wiring board |
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JP2008-211100 | 2008-08-19 | ||
JP2008211100A JP2010050166A (ja) | 2008-08-19 | 2008-08-19 | プリント配線板 |
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JP (1) | JP2010050166A (ja) |
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KR101081280B1 (ko) | 2010-10-11 | 2011-11-08 | 엘지이노텍 주식회사 | Lvds 전송용 연성 회로 기판 및 그의 제조 방법 |
WO2012081369A1 (ja) * | 2010-12-17 | 2012-06-21 | 新日鐵化学株式会社 | 電磁波ノイズ抑制体、その使用方法及び電子機器 |
KR102494337B1 (ko) * | 2015-10-27 | 2023-02-01 | 삼성전기주식회사 | 인쇄회로기판 및 그 제조방법 |
JP6508632B2 (ja) * | 2016-07-12 | 2019-05-08 | パナソニックIpマネジメント株式会社 | プリント配線板 |
WO2019107289A1 (ja) * | 2017-11-28 | 2019-06-06 | 住友電工プリントサーキット株式会社 | フレキシブルプリント配線板の製造方法及びフレキシブルプリント配線板 |
KR102575831B1 (ko) * | 2019-03-04 | 2023-09-07 | 주식회사 기가레인 | 연성 회로 기판 및 이를 포함하는 무선 단말기 |
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JP2010050166A (ja) | 2010-03-04 |
CN102124821A (zh) | 2011-07-13 |
CN102124821B (zh) | 2013-11-06 |
US20110147053A1 (en) | 2011-06-23 |
US8507801B2 (en) | 2013-08-13 |
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