WO2012017909A1 - プリント配線板の製造方法及びプリント配線板 - Google Patents
プリント配線板の製造方法及びプリント配線板 Download PDFInfo
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- WO2012017909A1 WO2012017909A1 PCT/JP2011/067257 JP2011067257W WO2012017909A1 WO 2012017909 A1 WO2012017909 A1 WO 2012017909A1 JP 2011067257 W JP2011067257 W JP 2011067257W WO 2012017909 A1 WO2012017909 A1 WO 2012017909A1
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- layer
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- copper plating
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- copper foil
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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
- H05K3/02—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding
- H05K3/06—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding the conductive material being removed chemically or electrolytically, e.g. by photo-etch process
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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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- 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
- H05K1/0296—Conductive pattern lay-out details not covered by sub groups H05K1/02 - H05K1/0295
- H05K1/0298—Multilayer circuits
-
- 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
- H05K3/42—Plated through-holes or plated via connections
- H05K3/421—Blind plated via connections
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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
- H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
- H05K3/42—Plated through-holes or plated via connections
- H05K3/425—Plated through-holes or plated via connections characterised by the sequence of steps for plating the through-holes or via connections in relation to the conductive pattern
-
- 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
- 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
- H05K2201/0358—Resin coated copper [RCC]
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/095—Conductive through-holes or vias
- H05K2201/09563—Metal filled via
-
- 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
Definitions
- the present invention relates to a printed wiring board manufacturing method and a printed wiring board that employ filled vias as an interlayer connection method, and more particularly to a printed wiring board manufacturing method and a printed wiring board in which a wiring pattern is formed by a subtractive method.
- semiconductor integrated circuit elements used as computer microprocessors and the like have become increasingly faster and more multifunctional.
- semiconductor elements used as computer microprocessors and the like have become increasingly faster and more multifunctional.
- the pitch between terminals of the semiconductor elements tends to become narrower.
- a package substrate or the like (hereinafter referred to as a “package substrate or the like”) that is a printed wiring board on which a semiconductor element is mounted has a finer wiring pattern due to a narrow pitch between terminals of the semiconductor element. It has been demanded.
- an outer layer circuit (surface layer circuit) on which a semiconductor element is mounted and an inner layer circuit are connected to each other through blind via holes (non-through holes) or through holes (through holes).
- an insulating layer and a copper foil as an outer layer are stacked on an inner layer substrate on which an inner layer circuit is formed, and non-through holes for interlayer connection are formed. And forming an electroless copper plating layer and an electrolytic copper plating layer on the copper foil in the non-through hole, in the through hole, and on the outer layer, and the outer layer and the inner layer are formed by the non-through hole and the through hole.
- a method for performing interlayer connection is described. At this time, a filled via filling the inside of the hole is formed in the non-through hole by electroless copper plating and electrolytic copper plating. Further, a copper plating layer having a predetermined thickness composed of an electroless copper plating layer and an electrolytic copper plating layer is formed on the inner wall of the through hole. Then, an outer layer circuit is formed by the subtractive method.
- the outer layer circuit has, for example, a wiring pattern pitch width of 40 ⁇ m or less, a line / space. There is a demand for a fine wiring pattern (hereinafter, L / S) of 20 ⁇ m / 20 ⁇ m or less.
- Patent Document 1 a copper plating layer having a thickness of about 35 ⁇ m is formed on the inner wall of the through hole in order to ensure interlayer connection.
- vacuum etching, anisotropic etching, and the like are known as methods for forming such a fine level circuit by the subtractive method. It becomes necessary.
- the semi-additive method if a semi-additive method is applied, it is possible to form such a fine circuit.
- the semi-additive method generally has a higher manufacturing cost and a lower yield than the subtractive method.
- a plating thickness of 20 ⁇ m or more is required.
- the present inventor has conceived a printed wiring board manufacturing method and a printed wiring board according to the present invention, and has achieved the above object.
- the printed wiring board manufacturing method has a surface roughness (Rzjis) of an adhesive surface (lamination surface) of 2 ⁇ m or less and a thickness of 5 ⁇ m or less via an insulating layer.
- a blind hole forming step of forming a blind hole with the conductor layer as a bottom, and an electroless copper plating layer on the surface of the copper foil layer and the inner wall surface of the blind hole Forming an electrolytic copper plating layer on the surface of the electroless copper plating layer so that the total thickness of the copper layer provided on the insulating layer and the plating step is 15 ⁇ m or less; Fill blind holes to the same position Panel plating step, etching resist forming step for forming an etching resist layer having a thickness of 15 ⁇ m or less on the surface of the copper layer, and etching step for etching the copper layer after the etching resist layer is formed to form a wiring pattern It is characterized by providing.
- the layer thickness of the copper foil layer after the electroless copper plating and the layer thickness of the electroless copper plating layer are totaled.
- the thickness is preferably 3 ⁇ m or less.
- a copper foil with a primer resin layer provided with a primer resin layer for ensuring adhesion to the insulating layer on the adhesive surface.
- the printed wiring board according to the present invention is a printed wiring board in which a copper layer and a conductor layer are interlayer-connected by a filled via having the conductor layer as a bottom portion through an insulating layer, and the copper layer is an adhesive surface
- stacked the copper foil layer, the electroless copper plating layer, and the electrolytic copper plating layer which were formed using the non-roughening copper foil whose surface roughness (Rzjis) is 2 micrometers or less and whose thickness is 5 micrometers or less in order
- the electrolytic copper plating layer is formed on the surface of the electroless copper plating layer by a panel plating method so that the total thickness (D) of the copper layer provided on the insulating layer is 15 ⁇ m or less.
- the filled via is characterized in that the electrolytic copper plating layer is formed and filling by electrolytic copper plating is completed to the same position as the surface of the electrolytic copper plating layer.
- the total thickness of the non-roughened copper foil layer and the layer thickness of the electroless copper plating layer may be 3 ⁇ m or less. preferable.
- a wiring pattern of L / S 20 ⁇ m / 20 ⁇ m or less is formed on the copper layer.
- the filling plating inside the blind via is completed as compared with the case where the interlayer connection is made using the through hole.
- the thickness of the electrolytic copper plating layer formed up to this can be reduced.
- the electrolytic copper plating layer can be formed on the surface of the electroless copper plating layer, and the blind hole can be filled to the same position as the surface of the electrolytic copper plating layer.
- a thin copper layer of 15 ⁇ m or less can be formed.
- the copper foil layer is formed using the non-roughened copper foil having an extremely smooth adhesive surface, it is not necessary to perform over-etching for dissolving the roughened portion. For this reason, a reduction in the top width can be suppressed as compared with the case where overetching is required, and a finer wiring pattern can be formed.
- the copper foil layer is formed using an ultrathin copper foil having a thickness of 5 ⁇ m or less, the half etching step before forming the electroless copper plating layer can be eliminated.
- the electrolytic copper plating layer is formed so that the total thickness of the copper layer formed on the insulating layer is 15 ⁇ m or less, the half-etching step after the formation of the electrolytic copper plating layer is unnecessary. it can. Therefore, according to the present invention, it is possible to prevent the in-plane variation of the thickness of the copper layer due to half etching, to increase the circuit formation accuracy, and to increase the reliability of the obtained circuit.
- the printed wiring board 100 according to the present invention is a double-sided printed wiring board or a multilayer printed wiring board having three or more conductor patterns. Since the printed wiring board according to the present invention can form a fine wiring pattern, it can be suitably used as a printed wiring board for mounting a semiconductor element called a package substrate, an interposer, or the like. Moreover, it may be used not only as a printed wiring board for mounting a semiconductor element, but also as a mother board or an inner layer circuit, and the use of the printed wiring board is not particularly limited. In the following, in order to distinguish between the conductor pattern constituting the copper layer 10 shown in FIG. 1 and the conductor pattern constituting the conductor layer 30, the conductor pattern constituting the copper layer 10 is referred to as a wiring pattern (not shown). The conductor pattern constituting the conductor layer 30 is referred to as a circuit pattern 31.
- the printed wiring board 100 according to the present invention has a configuration in which a copper layer 10 and a conductor layer 30 are interlayer-connected via an insulating layer 20 by a filled via 40 having the conductor layer 30 as a bottom.
- the copper connection between the copper layer 10 and the conductor layer 30 means that the wiring pattern constituting the copper layer 10 and the line pattern 31 constituting the conductor layer 30 are electrically connected. That means.
- the copper layer 10 has the structure by which the copper foil layer 11, the electroless copper plating layer 12, and the electrolytic copper plating layer 13 were laminated
- the filled via 40 has the conductor layer 30 as a bottom, and an inner wall surface of a through hole (hereinafter referred to as a blind hole 41) penetrating the copper layer 10 and the insulating layer 20 is covered with the electroless copper plating layer 12. Furthermore, the interior of the blind hole 41 is filled to the same position as the surface of the electrolytic copper plating layer 13.
- the inside of the blind hole 41 is filled up to the same position as the surface of the electrolytic copper plating layer 13” means that the surface position of the electrolytic copper plating filled in the blind hole 41 and the insulating layer
- the surface position of the electrolytic copper plating layer 13 formed on the electroless copper plating layer 12 on the substrate 20 substantially coincides with each other, and the deviation in the depth (thickness) direction of both surface positions is within 5 ⁇ m.
- the printed wiring board 100 according to the present invention will be described mainly by taking the multilayer printed wiring board 100 further including an insulating layer 20 and a conductor layer (not shown) below the conductor layer 30 as an example.
- the wiring board 100 may be a double-sided printed wiring board.
- the configuration of each layer and the configuration of the filled via 40 will be described.
- the copper layer 10 is an outer conductor layer on which a semiconductor element is mounted. As described above, the copper foil layer 11, the electroless copper plating layer 12, and the electrolytic copper plating layer 13 are laminated in order. Have a configuration.
- the total thickness (D) of the copper layer 10 is 15 ⁇ m or less.
- the total thickness (D) of the copper layer 10 refers to the layer thickness (D 1 ) of the copper foil layer 11, the layer thickness (D 2 ) of the electroless copper plating layer 12, and the electrolytic copper plating layer 13.
- the total thickness (D D 1 + D 2 + D 3 ) obtained by adding the layer thickness (D 3 ).
- the pitch width is 40 ⁇ m by the subtractive method, or the line / space width of the wiring pattern (hereinafter, A fine wiring pattern with L / S) of 20 ⁇ m / 20 ⁇ m or less can be formed.
- the total thickness (D) of the copper layer 10 is preferably 13 ⁇ m or less, and more preferably 10 ⁇ m or less. According to the method for manufacturing a printed wiring board according to the present invention to be described later, the total thickness (D) of the copper layer 10 can be 10 ⁇ m or less, and a finer wiring pattern can be formed.
- the copper foil layer 11 is formed using a non-roughened copper foil having a surface roughness (Rzjis) of an adhesive surface of 2 ⁇ m or less and a thickness of 5 ⁇ m or less.
- a smooth adhesive surface having a surface roughness (Rzjis) of 2 ⁇ m or less is laminated on the insulating layer 20.
- a half etching process can be made unnecessary by using the non-roughened copper foil of 5 micrometers or less.
- a copper foil having a thickness exceeding 5 ⁇ m it is necessary to reduce the thickness of the copper foil layer 11 by a half etching process. In this case, the in-plane variation of the copper foil layer increases, which affects the circuit formation accuracy, which is not preferable.
- Layer thickness (D 1 ) of copper foil layer 11 is not particularly defined.
- the layer thickness of the copper foil layer 11 (D 1), it is preferred thickness of the electroless copper plating layer 12 (D 1) and the total thickness of (D 1 + D 2) is 3 ⁇ m or less.
- the thickness (D 1 + D 2 ) when the electroless copper plating layer 12 is laminated on the copper foil layer 11 exceeds 3 ⁇ m, it is difficult to form the total thickness (D) of the copper layer 10 to 15 ⁇ m or less. Because there is.
- non-roughened copper foil When using an extremely thin non-roughened copper foil in this way, use a non-roughened copper foil with a carrier in which the support (carrier) is peelably laminated on the other side of the bonding surface of the ultrathin non-roughened copper foil. It is preferable to do.
- the handleability when the non-roughened copper foil is laminated on the insulating layer 20 is improved.
- an ultrathin copper foil having a layer thickness of 3 ⁇ m or less is also preferably used. be able to
- Primer resin layer In order to ensure good adhesion between the copper foil layer 11 and the insulating layer 20, a primer resin layer is interposed between the copper foil layer 11 and the insulating layer 20 in the laminate. It is preferable.
- the primer resin layer referred to in the present invention is a layer having a thickness of 1 ⁇ m to 5 ⁇ m made of a resin composition having an insulating property and having good adhesion to the insulating layer 20.
- a primer resin film is prepared, a non-roughened copper foil is laminated on the insulating layer 20 via the primer resin film, and hot pressing or the like is performed.
- a primer resin layer can be formed between the insulating layer 20 and the copper foil layer 11.
- a method is adopted in which a primer resin composition is applied to the surface of the insulating layer 20 to form a primer resin layer, a copper foil is laminated on the primer resin layer, and hot pressing or the like is performed. May be.
- a non-roughened copper foil with a primer resin layer in which these layers are provided in advance on the bonding surface of the non-roughened copper foil. Since the primer resin layer is provided in advance on the adhesive surface of the non-roughened copper foil, a step for forming these layers can be omitted when forming the laminate.
- a non-roughened copper foil with a primer resin layer include “MultiFoil (registered trademark) G (abbreviation: MFG)” manufactured by Mitsui Mining & Smelting Co., Ltd., “PF-E” manufactured by Hitachi Chemical Co., Ltd., and the like. Can be used.
- non-roughened copper foils with a primer resin layer are provided with a primer resin layer on the bonding surface of the non-roughened copper foil having a thickness of 5 ⁇ m or less, and the surface opposite to the bonding surface of the non-roughened copper foil Has a carrier. Therefore, the handleability of the non-roughened copper foil is good, and a non-roughened copper foil with an appropriate thickness can be selected according to the layer thickness (D 1 ) of the copper foil layer 11 to be formed.
- the electroless copper plating layer 12 is a copper plating layer formed on the surface of the copper foil layer 11 and the inner wall surface of the blind hole 41 by an electroless plating method. By forming the electroless copper plating layer 12 on the inner wall surface of the blind hole 41, the blind hole 41 can be filled by electrolytic copper plating.
- the layer thickness (D 2 ) of the electroless copper plating layer 12 itself is not particularly defined, as described above, the layer thickness (D 1 ) of the copper foil layer 11 and the layer thickness of the electroless copper plating layer 12 ( D 2) the thickness of when the the sum of the (D 1 + D 2) it is preferable to form an electroless copper plating layer 12 so as to 3 ⁇ m or less.
- the layer thickness (D 2 ) of the electroless copper plating layer is sufficient as a base layer for electrolytic plating. A thickness is sufficient, and a thickness of about 0.5 ⁇ m is sufficient.
- the electrolytic copper plating layer 13 is a layer formed on the electroless copper plating layer 12 so that the total thickness (D) of the copper layer 10 provided on the insulating layer 20 is 15 ⁇ m or less. Moreover, the filling plating of the blind hole 41 is completed with the formation of the electrolytic copper plating layer 13.
- the layer thickness (D 3 ) of the electrolytic copper plating layer 13 itself is not particularly specified.
- the electrolytic copper plating layer 13 is a layer formed on the electroless copper plating layer 12 so that the total thickness (D) of the copper layer 10 provided on the insulating layer 20 is 15 ⁇ m or less. "refers to the thickness of the copper foil layer 11 (D 1), in consideration of the thickness of the electroless copper plating layer 12 (D 2), the layer thickness of the electroless copper plating layer 12 (D 3) The electrolytic copper plating layer 13 is formed so that D 3 ⁇ 15 ⁇ (D 1 + D 2 ) or less.
- the copper layer 10 according to the present invention is not adjusted to have a thickness of 15 ⁇ m or less afterwards by a half-etching process or the like, but the total thickness of the copper layer 10 immediately after the formation of the electrolytic copper plating layer 13. It means that each layer was formed so that (D) was 15 ⁇ m or less.
- the filled via 40 is a non-through hole that penetrates the copper layer 10 and the insulating layer 20 and has the circuit pattern 31 constituting the conductor layer 30 as a bottom, and is formed on the insulating layer 20 by electrolytic copper plating. Further, it is filled up to the same position as the surface of the electrolytic copper plating layer 13.
- the filling plating in the blind hole 41 is performed on the surface of the electroless copper plating layer 12 so that the total thickness of the copper layer 10 provided on the insulating layer 20 is 15 ⁇ m or less. And completed.
- the hole diameter of the blind hole 41 is preferably about 20 ⁇ m to 120 ⁇ m, and the aspect ratio is preferably about 0.5 to 1.
- the filling of the blind hole 41 is completed to the same position as the surface of the electrolytic copper plating layer until the electrolytic copper plating layer 13 is formed to a predetermined thickness. It becomes difficult to let you. As a result, the total thickness (D) of the copper layer 10 formed on the insulating layer 20 needs to be increased.
- the copper layer 10 formed on the insulating layer 20 is a layer having a thickness of 15 ⁇ m or less.
- the blind hole 41 is formed between the wiring pattern constituting the copper layer 10 and the circuit pattern 31 constituting the conductor layer 30. Since a configuration in which electrical connection is made by electrolytic copper plating filled in the hole is adopted, interlayer connection between the copper layer 10 and the conductor layer 30 can be ensured. In other words, the interlayer connection between the copper layer 10 and the conductor layer 30 is performed by the filled via 40, so that the electrical connection between the wiring pattern constituting the copper layer 10 and the circuit pattern 31 constituting the conductor layer 30 is ensured. In addition, the total thickness (D) of the copper layer 10 formed on the insulating layer 20 can be reduced.
- the material for forming the insulating layer 20 is not particularly specified.
- a film-like adhesive sheet having an insulating resin such as an epoxy resin, a polyimide resin, a cyanate resin, a BT resin, or a thermosetting PPE resin as a main component can be used.
- the insulating resin may contain an inorganic filler.
- the inorganic filler By including the inorganic filler, rigidity is imparted to the insulating layer 20, and the component mountability is improved, and the laser processability is improved. Moreover, when laminating the insulating layer 20 and the copper foil layer 11 on the conductive layer 30, a non-roughened copper foil with resin in which a resin layer is provided in advance on the bonding surface of the non-roughened copper foil is used. May be. Furthermore, even if the varnish etc. which have the said insulating resin as a main component are applied, the varnish is apply
- the layer thickness of the insulating layer 20 is within a predetermined range determined in accordance with the layer thickness (D 3 ) of the electrolytic copper plating layer 13 to be formed, the hole diameter of the blind hole 41, etc., from the viewpoint of performing filling plating on the blind hole 41.
- the blind hole 41 is formed until the thickness (D 3 ) of the electrolytic copper plating layer 13 is deposited on the electroless copper plating layer 12 in the range of D 3 ⁇ 15 ⁇ (D 1 + D 2 ). It is sufficient that the layer thickness is in a range where the filling plating can be completed.
- the conductor layer 30 is a layer configured by the circuit pattern 31 and is a layer connected to the copper layer 10 as described above.
- the inner circuit layer of the multilayer printed wiring board 100 on which the circuit pattern 31 is formed corresponds.
- the circuit pattern 31 which comprises the conductor layer 30 should just be formed using electroconductive materials, such as copper or a copper alloy, and there is no prescription
- a portion that is electrically connected to the wiring pattern constituting the copper layer 10 is simply referred to as a circuit pattern 31.
- the formation method of the circuit pattern 31 and the pitch width of the circuit pattern 31 are not particularly limited.
- the printed wiring board 100 according to the present invention may be a double-sided printed wiring board.
- the conductor layer 30 corresponds to a layer constituted by a circuit pattern 31 formed on the other surface side of the copper layer 10.
- the method for manufacturing a printed wiring board according to the present invention includes a laminate forming step, a blind hole forming step, an electroless copper plating step, a panel plating step, an etching resist forming step, and an etching step.
- the printed wiring board 100 according to the present invention described above can be manufactured.
- it demonstrates in order of a process.
- the laminated body forming process according to the present invention is a non-rough type in which the surface roughness (Rzjis) of the conductor layer 30, the insulating layer 20, and the adhesive surface is 2 ⁇ m or less and the thickness is 5 ⁇ m or less. It is the process of forming the laminated body which laminated
- the conductor layer 30 is an inner circuit layer of a multilayer printed wiring board will be described first.
- the adhesive sheet or prepreg and the non-roughened copper foil are formed on the upper surface of the conductor layer 30.
- the conductor layer 30 and the non-roughened copper foil are bonded to the insulating layer 20 by laminating the layers and performing hot press processing, vacuum lamination processing, or the like, so that the stacked body can be formed.
- the insulating layer 20 is formed on the conductor layer 30 by applying a varnish mainly composed of an insulating resin to form a coating film, followed by drying, heat treatment, and the like, the insulating layer 20 is formed on the insulating layer 20.
- the laminated body can be formed by laminating the non-roughened copper foil and performing hot pressing.
- the method for laminating the insulating layer and the non-roughened copper foil is not particularly limited, and may be appropriately performed by an appropriate method.
- the surface roughness (bonding surface) of the adhesive surface (bonding surface) is formed on at least one surface of the insulating substrate using a known copper-clad laminate manufacturing method.
- Rzjis is 2 ⁇ m or less and a non-roughened copper foil having a thickness of 5 ⁇ m or less is laminated, and an arbitrary copper foil is suitably laminated to the other surface side, whereby the copper foil layer 11 and The laminated body having a configuration in which the conductor layer 30 is laminated can be formed.
- the circuit pattern 31 can be formed on the conductor layer 30 by the same method. That is, the circuit pattern 31 can be formed on the conductor layer 30 using a known method for manufacturing a double-sided printed wiring board.
- the conductor layer 30 may be one in which a circuit pattern 31 is formed by a transfer method.
- the circuit pattern 31 is formed by electrolytic copper plating on a support made of a stainless steel plate or the like, or the copper foil laminated on the support made of a special sheet is etched. 31 may be formed. In this case, the support may be removed at an appropriate stage as appropriate.
- the above-described primer resin layer having a layer thickness of 1 ⁇ m to 5 ⁇ m is not roughened copper. It is preferable to use a non-roughened copper foil with a primer resin layer laminated on the adhesive surface of the foil. Moreover, in order to improve the handleability at the time of laminating
- the copper foil layer 11 is subjected to various pretreatments (blackening treatment, soft etching treatment, etc.) on the surface before reaching the electroless copper plating step.
- pretreatments blackening treatment, soft etching treatment, etc.
- the thickness of the non-roughened copper foil used when forming the copper foil layer 11 may be selected as appropriate in consideration of the fact that the thickness of the copper foil layer 11 is reduced in a very small amount.
- the blind hole forming step is a step of forming a blind hole 41 having the conductor layer 30 as a bottom portion from the copper foil layer 11 side with respect to the laminated body formed in the laminated body forming step.
- the blind hole 41 is formed by laser processing.
- the copper foil layer 11 may be blackened before the holes are formed in order to facilitate the formation of the blind holes 41 by laser.
- a blind hole 41 having a bottom 31 can be formed.
- a desmear process for removing the resin smear remaining in the blind hole 41 and a soft etching for removing the oxide on the surface of the copper foil layer 11 are performed prior to the next electroless copper plating step. Processing may be performed.
- the electroless copper plating step is a step of forming the electroless copper plating layer 12 on the surface of the copper foil layer 11 laminated on the insulating layer 20 and the inner wall surface of the blind hole 41. is there.
- a catalyst Pd-Sn
- tin is removed from the accelerator liquid, and palladium for electroless copper plating is nucleated on the surface of the copper foil layer 11 and the inner wall surface of the blind hole 41.
- a known electroless copper plating solution such as a Rochelle salt type electroless copper plating solution or an EDTA type electroless copper plating solution is appropriately prepared, and the surface of the copper foil layer 11 and the inner wall surface of the blind hole 41 are electrolessly formed.
- a copper plating layer 12 is formed.
- the layer thickness (D 2 ) of the electroless copper plating layer 12 deposited at this time is as described above.
- the electrolytic copper plating layer 13 is formed on the surface of the electroless copper plating layer 12 so that the total thickness (D) of the copper layer 10 provided on the insulating layer 20 is 15 ⁇ m or less. And the filling plating of the blind hole 41 is completed to the same position as the surface of the electrolytic copper plating layer 13.
- the total thickness (D) of the copper layer 10 provided on the insulating layer 20 is the layer thickness (D 1 ) of the copper foil layer 11 provided on the insulating layer 20 and the copper foil as described above.
- the layer thickness (D 2 ) of the electroless copper plating layer 12 formed on the layer 11 and the layer thickness (D 3 ) of the electrolytic copper plating layer 13 formed on the electroless copper plating layer 12 were totaled.
- the total thickness (D) of the copper layer 10 is indicated. Therefore, in the panel plating step, the electrolytic copper plating is deposited on the electroless copper plating layer 12 so that the layer thickness (D 3 ) of the electrolytic copper plating layer 13 is D 3 ⁇ 15 ⁇ (D 1 + D 2 ). .
- the electrolytic copper plating layer 13 is deposited on the electroless copper plating layer 12 so that the thickness (D 3 ) of the electrolytic copper plating layer 13 is D 3 ⁇ 15 ⁇ (D 1 + D 2 ). Then, the filling plating of the blind hole 41 is completed.
- panel plating is performed using an electrolytic copper plating solution with improved filling properties.
- the panel plating step it is necessary to fill the blind hole 41 and to form the electrolytic copper plating layer 13 thinly on the insulating layer 20 via the electroless copper plating layer 12. Therefore, by adopting an electrolytic copper plating solution having a high filling property, copper plating is performed until the thickness (D 3 ) of the electrolytic copper plating layer 13 becomes D 3 ⁇ 15 ⁇ (D 1 + D 2 ), As shown in FIG. 2, the blind hole 41 can be filled up to the same position as the surface of the electrolytic copper plating layer 13. However, FIG.
- the copper foil layer 11 has a layer thickness (D 1 ) of 1.5 ⁇ m, and the electroless copper plating layer 12 has a layer thickness (D 2 ) of about 0.5 ⁇ m.
- the layer thickness (D 3 ) of the plating layer 13 is 10 ⁇ m.
- the electrolytic copper it is possible to employ an electrolytic copper plating solution that reduces the throwing power of the plating solution and specializes in filling properties. Thereby, even if it is a case where the layer thickness of the electrolytic copper plating layer 13 is formed thinly, the blind hole 41 can be filled up to at least the same position as the surface of the electrolytic copper plating layer 13. Thereby, while ensuring the interlayer connection of the copper layer 10 and the conductor layer 30, the copper layer 10 on the insulating layer 20 can be formed in 15 micrometers or less.
- the half etching step after the formation of the electrolytic copper plating layer 13 can be eliminated, the in-plane variation of the layer thickness of the copper layer 10 caused by the half etching is prevented, and the circuit formation accuracy is increased. Therefore, the reliability of the obtained circuit can be increased.
- FIG. 3 shows a panel plating process in which the thickness of the electrolytic copper plating layer 13 is 10 ⁇ m on the electroless copper plating layer 12 by using an ordinary electrolytic copper plating solution for via fill.
- the state of filling plating in the blind hole when performed is shown.
- FIG. 3 is manufactured in the same manner as the printed wiring board 100 shown in FIG. 2 except that the electrolytic copper plating solution is changed.
- the filling plating of the blind hole 41 is insufficient, and the upper surface of the filled via is larger than the surface position of the electrolytic copper plating layer 13. It can be seen that the dent does not reach the upper surface position of the insulating layer 20.
- FIG. 4 shows an electrolytic copper plating layer 13 and a blind hole 41 when the blind hole 41 is filled to the extent that there is no problem in interlayer connection using an ordinary electrolytic copper plating solution for via fill.
- the state of filling plating applied to is shown.
- the thickness of the electrolytic copper plating layer 13 was 25 ⁇ m.
- the copper foil layer 11 is formed using a general-purpose electrolytic copper foil having a thickness of 12 ⁇ m.
- the above range (D 3 ⁇ 15 ⁇ (D 1 + D) is formed on the electroless copper plating layer 12 by employing an electrolytic copper plating solution with improved filling properties in the panel plating step. 2 )), the electrolytic copper plating layer 13 can be deposited, and the filling of the blind hole 41 by electrolytic copper plating can be completed to the same position as the surface of the electrolytic copper plating layer 13.
- An example of the electrolytic copper plating solution is a copper sulfate plating solution.
- a polymeric surfactant or the like for suppressing an electrodeposition reaction is added to copper sulfate and sulfuric acid.
- the additive amount for suppressing the electrodeposition reaction is reduced, the additive for promoting the electrodeposition rate, the leveling agent, etc.
- the etching resist formation step is a step of forming an etching resist layer having a thickness of 15 ⁇ m or less on the surface of the copper layer 10 formed as described above.
- the thickness of the etching resist layer is more preferably 10 ⁇ m or less.
- an etching resist layer can be formed according to the wiring pattern formed in the outer layer circuit using a dry film.
- a dry film By using a dry film, the etching resist layer can be easily formed, and the cost can be reduced.
- the etching resist layer may be formed using a liquid resist. By using a liquid resist, it is possible to reduce the thickness of the etching resist layer and to form a finer wiring pattern.
- a dry film is used. Is preferred.
- the copper layer 10 is etched to form a wiring pattern that forms an outer layer circuit.
- L / S 20 ⁇ m / 20 ⁇ m
Abstract
Description
まず、本件発明に係るプリント配線板100について説明する。本件発明に係るプリント配線板100は、両面プリント配線板、或いは、導体パターンを3層以上有する多層プリント配線板である。本件発明に係るプリント配線板は、微細な配線パターンの形成が可能であるため、例えば、パッケージ基板、インターポーザ等と称される半導体素子搭載用のプリント配線板として好適に用いることができる。また、半導体素子搭載用のプリント配線板だけではなく、マザーボードや内層回路として用いてもよく、当該プリント配線板の用途に特に限定はない。また、以下において、図1に示す銅層10を構成する導体パターンと、導体層30を構成する導体パターンとを区別するために、銅層10を構成する導体パターンを配線パターン(図示略)と称し、導体層30を構成する導体パターンを回路パターン31と称する。
銅層10は、半導体素子が搭載される外層導体層であり、上述した通り、銅箔層11と、無電解銅めっき層12と、電解銅めっき層13とが順に積層された構成を有する。当該銅層10の合計厚さ(D)は、15μm以下に形成されている。ここで、銅層10の合計厚さ(D)とは、銅箔層11の層厚(D1)と、無電解銅めっき層12の層厚(D2)と、電解銅めっき層13の層厚(D3)とを合計した合計厚さ(D=D1+D2+D3)をいう。絶縁層20上に形成されたこれら各層から成る銅層10の合計厚さ(D)を15μm以下とすることにより、サブトラクティブ法によりピッチ幅40μm、或いは、配線パターンのライン/スペース幅(以下、L/S)が20μm/20μm以下の微細な配線パターンを形成することができる。微細な配線パターンを形成可能とするため、銅層10の合計厚さ(D)は、13μm以下であることが好ましく、10μm以下であることが更に好ましい。後述する本件発明に係るプリント配線板の製造方法によれば、銅層10の合計厚さ(D)を10μm以下にすることが可能であり、より微細な配線パターンの形成が可能である。但し、本件発明に係るプリント配線板100において、ピッチ幅40μm、或いは、L/S=20μm/20μmを超える配線パターンを形成してもよいのは勿論である。以下、銅層10を構成する各層について説明する。
銅箔層11は、接着面の表面粗さ(Rzjis)が2μm以下であり、且つ、厚さが5μm以下の無粗化銅箔を用いて形成されたものである。この無粗化銅箔を絶縁層20上に積層する際は、表面粗さ(Rzjis)が2μm以下の平滑な接着面を絶縁層20上に積層する。このように、平滑な接着面を有する無粗化銅箔を絶縁層20に積層することにより、粗化処理部分を完全に溶解するためのオーバーエッチングを不要にすることができ、トップ幅の減少を防止することができる。また、5μm以下の無粗化銅箔を用いることにより、ハーフエッチング工程を不要にすることができる。一方、5μmを超える厚さの銅箔を用いると、ハーフエッチング工程により、銅箔層11の厚みを削減する必要が生じる。この場合、銅箔層の面内バラツキが大きくなり、回路形成精度に影響を与えるため好ましくない。
ここで、プライマ樹脂層の形成方法としては、プライマ樹脂フィルムを用意して、絶縁層20上にプライマ樹脂フィルムを介して無粗化銅箔を積層し、熱間プレス加工等を行うことにより、絶縁層20と銅箔層11との間にプライマ樹脂層を形成することができる。当該方法に代えて、プライマ樹脂組成物を絶縁層20の表面に塗布してプライマ樹脂層を形成し、プライマ樹脂層上に銅箔を積層して、熱間プレス加工等を行う方法を採用してもよい。
無電解銅めっき層12は、銅箔層11の表面及び上記ブラインド孔41の内壁面に、無電解めっき法により形成された銅めっき層である。ブラインド孔41の内壁面に無電解銅めっき層12を形成することにより、ブラインド孔41を電解銅めっきにより充填することが可能になる。当該無電解銅めっき層12自体の層厚(D2)は特に規定しないが、上述した通り、上記銅箔層11の層厚(D1)と、当該無電解銅めっき層12の層厚(D2)とを合計したときの厚さ(D1+D2)が3μm以下になるように無電解銅めっき層12を形成することが好ましい。無電解銅めっき層12は、ブラインド孔41の内壁面に導通性を与える目的で設けられる層であるため、無電解銅めっき層の層厚(D2)は、電解めっきの下地層として十分な厚みがあれば足り、0.5μm程度の厚みがあれば十分である。
電解銅めっき層13は、絶縁層20上に設けられる銅層10の合計厚さ(D)が15μm以下となるように、無電解銅めっき層12上に形成された層である。また、当該電解銅めっき層13の形成とともに、ブラインド孔41の充填めっきが完了される。本件発明において、電解銅めっき層13自体の層厚(D3)は特に規定していない。銅箔層11の層厚(D1)と、無電解銅めっき層12の層厚(D2)とに基づいて、銅層10の合計厚さ(D)が15μm以下になるように電解銅めっき層13を形成することで、上述した通り、サブトラクティブ法によりL/S=20μm/20μm以下の微細な配線パターンを形成することができるためである。
フィルドビア40は、上述した通り、銅層10及び絶縁層20を貫通し、導体層30を構成する回路パターン31を底部とする非貫通孔であり、電解銅めっきにより、絶縁層20上に形成された電解銅めっき層13の表面と同位置程度まで充填されたものである。本件発明において、ブラインド孔41内の充填めっきは、絶縁層20上に設けられる銅層10の合計厚さが15μm以下となるように、前記無電解銅めっき層12の表面に電解銅めっき層13を形成すると共に完了されたものである。ブラインド孔41の孔径は、20μm~120μm程度であることが好ましく、アスペクト比は、0.5~1程度であることが好ましい。ブラインド孔41の孔径及びアスペクト比が上記範囲を逸脱すると、電解銅めっき層13を所定の厚さまで形成するまでの間に、電解銅めっき層の表面と同位置程度までブラインド孔41の充填を完了させにくくなる。その結果、絶縁層20上に形成する銅層10の合計厚さ(D)を厚くする必要性が生じる。
次に、絶縁層20について説明する。本件発明において、絶縁層20を形成する材料について、特に規定はない。エポキシ樹脂、ポリイミド樹脂、シアネート樹脂、BT樹脂、熱硬化性PPE樹脂等の絶縁性樹脂を主成分とするフィルム状の接着シート等を用いることができる。また、上記絶縁性樹脂をガラスクロスやアラミド樹脂の繊維からなる不織布等に含浸させたプリプレグ等を用いてもよい。さらに絶縁性樹脂は、無機フィラーを含むものであってもよい。無機フィラーを含むことにより、絶縁層20に剛性を与え、部品実装性を高めると共に、レーザーの加工性が向上する。また、導電層30上に、絶縁層20と、銅箔層11とを積層する際に、上記無粗化銅箔の接着面に樹脂層が予め設けられた樹脂付無粗化銅箔を用いてもよい。さらに、当該絶縁性樹脂を主成分とするワニス等を用いて、導体層30上にワニスを塗布して、塗布膜を形成し、乾燥、熱処理等の工程を経て形成されたものであってもよい。
導体層30は、回路パターン31により構成された層であり、上述した通り、銅層10と層間接続される層である。例えば、回路パターン31が形成された、多層プリント配線板100の内層回路層が相当する。また、導体層30を構成する回路パターン31は、銅又は銅合金等の導電性材料を用いて形成されていればよく、その材料や層厚等について特に規定はない。なお、本件明細書においては、説明が複雑化することを防止するため、銅層10を構成する配線パターンと電気的に接続される部分を単に回路パターン31と称している。また、回路パターン31の形成方法や、回路パターン31のピッチ幅等についても、特に限定されるものではない。また、上述した通り、本件発明に係るプリント配線板100は、両面プリント配線板であってもよい。この場合、当該導体層30は、銅層10の他面側に形成された回路パターン31により構成された層に相当する。
次に、本件発明に係るプリント配線板の製造方法について説明する。本件発明に係るプリント配線板の製造方法は、積層体形成工程と、ブラインド孔形成工程と、無電解銅めっき工程と、パネルめっき工程と、エッチングレジスト形成工程と、エッチング工程とを備えている。当該各工程を経ることにより、上述した本件発明に係るプリント配線板100を製造することができる。以下、工程順に説明する。
本件発明に係る積層体形成工程は、導体層30と、絶縁層20と、接着面の表面粗さ(Rzjis)が2μm以下であり且つ厚さが5μm以下の無粗化銅箔を用いて形成された銅箔層11とを積層した積層体を形成する工程である。ここでは、まず、導体層30が多層プリント配線板の内層回路層である場合について説明する。
次に、ブラインド孔形成工程について説明する。ブラインド孔形成工程は、上記積層体形成工程において形成された積層体に対して、銅箔層11側から、導体層30を底部とするブラインド孔41を形成する工程である。ブラインド孔41は、レーザー加工により形成する。このとき、必要に応じて、レーザーによるブラインド孔41の形成を容易にするため、孔開け前に銅箔層11に黒化処理を施してもよい。例えば、上記積層体の銅箔層11側から、炭酸ガスレーザー、YAGレーザー、エキシマレーザー等を照射することにより、銅箔層11及び絶縁層20を貫通し、導体層30に形成された回路パターン31を底部とするブラインド孔41を形成することができる。なお、次の無電解銅めっき工程に先立って、ブラインド孔41を形成した後、ブラインド孔41内に残留した樹脂スミアを除去するデスミア処理や、銅箔層11表面の酸化物を除去するソフトエッチング処理を行ってもよい。
無電解銅めっき工程は、絶縁層20上に積層された銅箔層11の表面及び上記ブラインド孔41の内壁面上に無電解銅めっき層12を形成する工程である。無電解銅めっき工程では、まず、前処理として、例えば、プリディップし、パラジウム(Pd)、すず(Sn)コロイド溶液からなるキャタリストで触媒(Pd-Sn)を銅箔層11の表面及びブラインド孔41の内壁面に付着させる。そして、アクセレータ液ですずを除去し、銅箔層11の表面及びブラインド孔41の内壁面に無電解銅めっきを行うためのパラジウムを核付けする。そして、ロシェル塩タイプの無電解銅めっき液、EDTAタイプの無電解銅めっき液等、公知の無電解銅めっき液を適宜調製し、銅箔層11の表面及びブラインド孔41の内壁面に無電解銅めっき層12を形成する。このときに析出させる無電解銅めっき層12の層厚(D2)は上述した通りである。当該無電解銅めっき工程により、ブラインド孔41の内壁面に導通性を与えることができ、次工程である電解銅めっき法によるブラインド孔41の充填めっきが可能になる。
パネルめっき工程は、絶縁層20上に設けられる銅層10の合計厚さ(D)が15μm以下となるように、無電解銅めっき層12の表面に電解銅めっき層13を形成すると共に、当該電解銅めっき層13の表面と同位置程度までブラインド孔41の充填めっきを完了する工程である。ここで、絶縁層20上に設けられる銅層10の合計厚さ(D)とは、上述した通り、絶縁層20上に設けられる銅箔層11の層厚(D1)と、この銅箔層11上に形成された無電解銅めっき層12の層厚(D2)と、この無電解銅めっき層12上に形成される電解銅めっき層13の層厚(D3)とを合計した銅層10の合計厚さ(D)を指す。従って、パネルめっき工程において、電解銅めっき層13の層厚(D3)が、D3≦15-(D1+D2)になるように電解銅めっきを無電解銅めっき層12上に析出させる。パネルめっき工程においては、電解銅めっき層13の層厚(D3)が、D3≦15-(D1+D2)になるように電解銅めっきを無電解銅めっき層12上に析出させると共に、ブラインド孔41の充填めっきを完了させる。
エッチングレジスト形成工程は、以上の様にして形成された銅層10の表面に厚さが15μm以下のエッチングレジスト層を形成する工程である。銅層10の表面に形成するエッチングレジスト層の厚さが15μmを超えると、銅層10の厚みが15μm以下であっても、L/S=20μm/20μm以下の微細な配線パターンをエッチング処理により形成するのが困難になる。解像度が悪くなり、エッチング液の液回りが悪くなるためである。また、配線パターンを良好なエッチングファクターで形成するためには、エッチングレジスト層の厚さは10μm以下であることがより好ましい。
エッチング工程では、上記銅層10に対してエッチング処理を施し、外層回路を成す配線パターンを形成する。このとき、銅層10を上述のように形成することにより、L/S=20μm/20μm以下の配線パターンを形成することが可能となる。但し、L/S=20μm/20μmを超える配線パターンの形成が可能であるのは勿論である。
11・・・銅箔層
12・・・無電解銅めっき層
13・・・電解銅めっき層
20・・・絶縁層
30・・・導体層
100・・・プリント配線板
Claims (7)
- 絶縁層を介して、接着面の表面粗さ(Rzjis)が2μm以下であり且つ厚さが5μm以下の無粗化銅箔を用いて形成された銅箔層と、導体層とを積層した構成を備える積層体を形成する積層体形成工程と、
当該積層体に対して、当該銅箔層と絶縁層とを貫通し、前記導体層を底部とするブラインド孔を形成するブラインド孔形成工程と、
当該銅箔層の表面及び当該ブラインド孔の内壁面上に無電解銅めっき層を形成する無電解銅めっき工程と、
絶縁層上に設けられる銅層の合計厚さが15μm以下になるように、前記無電解銅めっき層の表面に電解銅めっき層を形成すると共に、当該電解銅めっき層の表面と同位置程度までブラインド孔を充填するパネルめっき工程と、
当該銅層の表面に、厚さが15μm以下のエッチングレジスト層を形成するエッチングレジスト形成工程と、
エッチングレジスト層形成後の銅層をエッチングし、配線パターンを形成するエッチング工程と、
を備えることを特徴とするプリント配線板の製造方法。 - 前記無電解銅めっき工程において、前記無電解銅めっき後の前記無粗化銅箔層の層厚と前記無電解銅めっき層の層厚とを合計したときの厚さが3μm以下である請求項1に記載のプリント配線板の製造方法。
- 前記エッチング工程において形成する配線パターンがL/S=20μm/20μm以下である請求項1に記載のプリント配線板の製造方法。
- 前記積層体形成工程において、前記絶縁層を介して、前記無粗化銅箔と前記導体層とを積層する際に、前記無粗化銅箔の接着面に、前記絶縁層との接着性を確保するためのプライマ樹脂層を備えたプライマ樹脂層付無粗化銅箔を用いる請求項1に記載のプリント配線板の製造方法。
- 絶縁層を介して、銅層と、導体層とが、当該導体層を底部とするフィルドビアにより層間接続されたプリント配線板であって、
当該銅層は接着面の表面粗さ(Rzjis)が2μm以下であり且つ厚さが5μm以下の無粗化銅箔を用いて形成された銅箔層、無電解銅めっき層及び電解銅めっき層を順に積層した構成を備えるものであり、
前記電解銅めっき層は、パネルめっき法により、絶縁層上に設けられる銅層の合計厚さ(D)が15μm以下になるように、前記無電解銅めっき層の表面に形成されたものであり、
前記フィルドビアは、前記電解銅めっき層が形成されると共に、前記電解銅めっき層の表面と同位置程度まで電解銅めっきによる充填が完了したものであることを特徴とするプリント配線板。 - 前記銅層において、前記無粗化銅箔層の層厚と、前記無電解銅めっき層の層厚とを合計したときの厚さが3μm以下である請求項5に記載のプリント配線板。
- 前記銅層に形成された配線パターンは、L/S=20μm/20μm以下である請求項5に記載のプリント配線板。
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US13/813,678 US9144157B2 (en) | 2010-08-03 | 2011-07-28 | Manufacturing method of printed wiring board and printed wiring board |
CN201180037490.7A CN103039131B (zh) | 2010-08-03 | 2011-07-28 | 印刷布线板的制造方法以及印刷布线板 |
KR1020137001688A KR101882530B1 (ko) | 2010-08-03 | 2011-07-28 | 프린트 배선판의 제조 방법 및 프린트 배선판 |
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CN103039131B (zh) | 2015-11-25 |
US20130213701A1 (en) | 2013-08-22 |
TWI462668B (zh) | 2014-11-21 |
MY159991A (en) | 2017-02-15 |
TW201208507A (en) | 2012-02-16 |
KR20130096222A (ko) | 2013-08-29 |
CN103039131A (zh) | 2013-04-10 |
JP5580135B2 (ja) | 2014-08-27 |
KR101882530B1 (ko) | 2018-07-26 |
US9144157B2 (en) | 2015-09-22 |
JP2012038772A (ja) | 2012-02-23 |
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