WO2015010400A1 - 印制电路板子板及印制电路板的制造方法和印制电路板 - Google Patents

印制电路板子板及印制电路板的制造方法和印制电路板 Download PDF

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Publication number
WO2015010400A1
WO2015010400A1 PCT/CN2013/087895 CN2013087895W WO2015010400A1 WO 2015010400 A1 WO2015010400 A1 WO 2015010400A1 CN 2013087895 W CN2013087895 W CN 2013087895W WO 2015010400 A1 WO2015010400 A1 WO 2015010400A1
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WO
WIPO (PCT)
Prior art keywords
printed circuit
circuit board
insulating layer
board
layer
Prior art date
Application number
PCT/CN2013/087895
Other languages
English (en)
French (fr)
Inventor
吴会兰
黄勇
Original Assignee
北大方正集团有限公司
珠海方正科技高密电子有限公司
珠海方正印刷电路板发展有限公司
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Filing date
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Application filed by 北大方正集团有限公司, 珠海方正科技高密电子有限公司, 珠海方正印刷电路板发展有限公司 filed Critical 北大方正集团有限公司
Publication of WO2015010400A1 publication Critical patent/WO2015010400A1/zh

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Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00Apparatus or processes for manufacturing printed circuits
    • H05K3/46Manufacturing multilayer circuits
    • H05K3/4611Manufacturing multilayer circuits by laminating two or more circuit boards
    • H05K3/4614Manufacturing multilayer circuits by laminating two or more circuit boards the electrical connections between the circuit boards being made during lamination
    • H05K3/4617Manufacturing multilayer circuits by laminating two or more circuit boards the electrical connections between the circuit boards being made during lamination characterized by laminating only or mainly similar single-sided circuit boards
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00Apparatus or processes for manufacturing printed circuits
    • H05K3/007Manufacture or processing of a substrate for a printed circuit board supported by a temporary or sacrificial carrier
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00Apparatus or processes for manufacturing printed circuits
    • H05K3/40Forming printed elements for providing electric connections to or between printed circuits
    • H05K3/4038Through-connections; Vertical interconnect access [VIA] connections
    • H05K3/4053Through-connections; Vertical interconnect access [VIA] connections by thick-film techniques
    • H05K3/4069Through-connections; Vertical interconnect access [VIA] connections by thick-film techniques for via connections in organic insulating substrates
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00Apparatus or processes for manufacturing printed circuits
    • H05K3/46Manufacturing multilayer circuits
    • H05K3/4611Manufacturing multilayer circuits by laminating two or more circuit boards
    • H05K3/4626Manufacturing multilayer circuits by laminating two or more circuit boards characterised by the insulating layers or materials
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/01Tools for processing; Objects used during processing
    • H05K2203/0191Using tape or non-metallic foil in a process, e.g. during filling of a hole with conductive paste
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/06Lamination
    • H05K2203/068Features of the lamination press or of the lamination process, e.g. using special separator sheets
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00Apparatus or processes for manufacturing printed circuits
    • H05K3/0011Working of insulating substrates or insulating layers
    • H05K3/0017Etching of the substrate by chemical or physical means
    • H05K3/0026Etching of the substrate by chemical or physical means by laser ablation
    • H05K3/0032Etching of the substrate by chemical or physical means by laser ablation of organic insulating material
    • H05K3/0035Etching of the substrate by chemical or physical means by laser ablation of organic insulating material of blind holes, i.e. having a metal layer at the bottom

Definitions

  • the present invention relates to the field of printed circuit board technology, and in particular, to a printed circuit board (PCB) daughter board, a method of manufacturing the printed circuit board, and a printed circuit board.
  • PCB printed circuit board
  • ELIC PCB fabricated using ELIC technology
  • a prepreg is required to be pressed between any two adjacent inner core sheets to bond the adjacent two inner core sheets together.
  • the prepreg is also required to be pressed between the inner core layer and the outer core board (or metal foil) so that the inner core board and the outer core board are bonded together, and multiple times of pressing are required in the preparation process.
  • the embodiment of the invention provides a printed circuit board sub-board and a printed circuit board manufacturing method and a printed circuit board, which are used for solving the defects of low manufacturing precision, complicated process flow and long production cycle of the existing printed circuit board. problem.
  • Embodiments of the present invention provide a method of manufacturing a printed circuit board daughter board, the method comprising:
  • a conductive circuit pattern is formed by an additive method to obtain a wiring layer of the printed circuit board daughter board, wherein the insulating layer includes at least a first insulating substrate, and the first insulating substrate is The resin is in stage B; Drilling is performed at a predetermined position on the other side of the insulating layer to obtain a through hole penetrating the insulating layer; and the conductive paste is filled in the through hole to obtain the printed circuit board daughter board.
  • the insulating layer further comprises a second insulating substrate, and before the forming the conductive line pattern, the method further comprises:
  • fabricating the conductive circuit pattern specifically includes:
  • Drilling is performed at a predetermined position on the other side of the insulating layer, and the perforation through the insulating layer is specifically included:
  • Drilling is performed at a predetermined position on the first insulating substrate of the insulating layer to obtain perforations penetrating the first insulating substrate and the second insulating substrate.
  • the method before the forming the conductive line pattern, the method further includes: bonding a protective film on the other side of the insulating layer, the temperature of the bonding process being lower than the first insulating substrate The glass transition temperature of the resin;
  • Performing a drilling process on a predetermined position on the other side of the insulating layer to obtain a through hole penetrating the insulating layer specifically comprising: performing a drilling process on a predetermined position on the protective film to obtain a through-the-protection a perforation of the film and the insulating layer;
  • the method further includes: removing the protective film.
  • Embodiments of the present invention provide a method of manufacturing a printed circuit board, the method comprising:
  • the stack processing specifically includes:
  • At least two of the printed circuit board daughter boards and the metal foil are stacked in a predetermined order, wherein the metal foil is located at the outermost layer and is laminated with the insulation of the printed circuit board daughter board.
  • the method further includes:
  • Embodiments of the present invention provide a printed circuit board including at least one printed circuit board daughter board, wherein:
  • the printed circuit board sub-board includes an insulating layer and a wiring layer on one side of the insulating layer; the insulating layer includes at least a first insulating substrate, and the insulating layer is provided with a through hole penetrating the insulating layer
  • the through hole is formed by drilling a hole from the other side of the insulating layer, and the through hole is filled with a conductive paste.
  • the thickness of the conductive paste filled in the through holes is greater than the thickness of the insulating layer.
  • the insulating layer further includes a second insulating substrate on one side of the first insulating substrate; wherein: a circuit layer of the printed circuit board sub-board is formed on the second insulating substrate, The perforation is formed by drilling a hole from the other side of the first insulating substrate, and the through hole penetrates the first insulating substrate and the second insulating substrate.
  • a conductive circuit pattern is formed by an additive method to obtain a circuit layer of the printed circuit board sub-board, wherein the insulating layer includes at least a first insulating substrate, and the first insulating layer
  • the resin in the substrate is in the B stage; drilling is performed at a predetermined position on the other side of the insulating layer to obtain a through hole penetrating the insulating layer; the conductive paste is filled in the through hole to obtain a printed circuit board daughter board, and thus,
  • the manufacturing process of the printed circuit board sub-board provided by the embodiment of the invention is simple.
  • the printed circuit board sub-board provided by the embodiment of the invention can form a multilayer printed circuit board with any layer conduction only by one press-fitting process, thereby shortening the process flow, reducing the production cycle and improving the manufacturing. Accuracy;
  • the resin in the first insulating substrate in the printed circuit board daughter board provided by the embodiment of the present invention is in the B stage, when the multilayer printed circuit board is formed, since the additional prepreg is not required to be adhered The thickness of the multilayer printed circuit board produced is made thinner.
  • FIG. 1 is a flow chart of a method for manufacturing a printed circuit board sub-board according to an embodiment of the present invention
  • FIG. 2 is a flow chart of a method for manufacturing a first printed circuit board sub-board according to an embodiment of the present invention
  • 3A to 3G are schematic cross-sectional views showing the manufacturing process of the first printed circuit board sub-board according to the embodiment of the present invention.
  • FIG. 4 is a flow chart of a method for manufacturing a second printed circuit board sub-board according to an embodiment of the present invention
  • FIG. 5A to FIG. 5G are schematic cross-sectional structural views showing a second printed circuit board sub-board according to an embodiment of the present invention, which is manufactured by the method of FIG. 4;
  • FIG. 6 is a flow chart showing a manufacturing process of a printed circuit board according to an embodiment of the present invention.
  • FIG. 7 is a flow chart showing a manufacturing process of a first printed circuit board according to an embodiment of the present invention.
  • FIG. 8A to 8C are schematic cross-sectional structural views of a first printed circuit board in a manufacturing process according to an embodiment of the present invention
  • FIG. 9 is a flow chart showing a manufacturing process of a second printed circuit board according to an embodiment of the present invention.
  • 10A-10C are schematic cross-sectional views showing a second printed circuit board in a manufacturing process according to an embodiment of the present invention. detailed description
  • the printed circuit board daughter board prepared by the embodiment of the invention is in an intermediate state (ie, a semi-finished product), rather than a final state (ie, a finished product), and the printed circuit board daughter board is mainly used as an intermediate layer of the PCB when preparing the PCB, and other
  • the layer structure (such as metal foil) is laminated and pressed to obtain the desired PCB (ie, finished product).
  • a through hole is a hole formed between different circuit layers of a printed circuit board for electrical connection between different circuit layers of a printed circuit board, generally before the printed circuit board is fabricated.
  • the position and the aperture of the through hole in the printed circuit board for realizing the electrical connection between different circuit layers are preset, and then the printed circuit board is fabricated. Drilling is performed at a position corresponding to the preset position in each of the printed circuit board sub-boards to form a desired through hole.
  • Embodiments of the present invention provide a method of fabricating a printed circuit board daughter board for fabricating an arbitrary layer interconnect circuit board without a "core board", and preparing at least two of the printed circuit board daughter boards by one press-bonding process a printed circuit board.
  • an embodiment of the present invention provides a method of manufacturing a printed circuit board sub-board, the method comprising the following steps:
  • Step 11 On one side of the insulating layer, a conductive circuit pattern is formed by an additive method to obtain a circuit layer of the printed circuit board daughter board, wherein the insulating layer includes at least a first insulating substrate, and the first insulating substrate is The resin is in the B stage (B-stage, ie semi-cured state).
  • the circuit layer is formed on one side of the insulating layer by the additive method, and the circuit is made finer than the subtractive method, and generally can achieve a line width of less than 30 meters, and is reduced.
  • the minimum line width that can be achieved by the method is 40 ⁇ 50 microns.
  • the first insulating substrate may be an epoxy fiberglass cloth substrate, a woven fabric of an aromatic polyamide resin fiber, an epoxy resin non-woven substrate, a polyimide resin substrate, a polytetrafluoroethylene resin substrate, a polyphenylene ether resin substrate, a polyphenylene ether resin substrate, a cyanate resin substrate, a bismaleimide-modified triazine resin substrate, or the like, wherein the resin in the first insulating substrate is in a B-stage (ie, semi-cured state) .
  • a B-stage ie, semi-cured state
  • Step 12 Drilling a predetermined position on the other side of the insulating layer (ie, the surface opposite to the side on which the wiring layer is formed) to obtain a through hole penetrating the insulating layer.
  • the preset position is a position on the insulating layer corresponding to the through hole of the printed circuit board sub-board to which the insulating layer belongs to be connected to the circuit layer of the other sub-boards of the printed circuit board.
  • the drilling process includes laser drilling, mechanical drilling or punching, etc., wherein the laser drilling further includes infrared laser drilling and ultraviolet laser drilling.
  • the drilling process of the embodiment of the present invention is laser drilling, thereby making it easier to control the hole depth.
  • Step 13 Fill the through holes formed in the step 12 with the conductive paste to obtain a printed circuit board daughter board.
  • the conductive paste (also referred to as conductive paste) includes, but is not limited to, one or a mixture of at least two of the following: copper paste, silver paste, carbon paste, and the like.
  • step 13 the conductive paste is filled in the perforation, and the manual plug hole, the semi-automatic printer plug hole, the full-automatic printer plug hole or the vacuum plug hole plug hole may be used.
  • the method further comprises:
  • a protective film is bonded to the other side of the insulating layer (i.e., the surface opposite to the wiring layer), and the temperature of the bonding treatment is lower than the glass transition temperature of the resin in the first insulating substrate.
  • step 12 drilling is performed on a predetermined position on the other side of the insulating layer (ie, the surface opposite to the circuit layer) to obtain a through hole penetrating the insulating layer, and specifically includes:
  • Drilling is performed at a predetermined position on the protective film to obtain perforations penetrating the protective film and the insulating layer.
  • step 13 the method further includes:
  • the protective film may be a polyester protective film, a polyimide protective film or a thousand film or the like.
  • the protective film can be removed by an alkaline solution; if the protective film is a polyester protective film or a polyimide protective film, the protective film can be removed by hand.
  • the protective film is attached to the surface of the insulating layer opposite to the circuit layer, not only the other side of the insulating layer can be protected from plating during the plating process, but also in the manufacturing process.
  • the first insulating substrate is protected from being damaged by external corrosion, and can also serve the following effects: First, during the process of filling the perforations, the overflowing conductive adhesive will remain on the protective film without Residual on the insulating layer, after the completion of the production, the protective film is removed, and the residual conductive adhesive can be removed, thereby ensuring that the surface of the printed circuit board is not contaminated by the conductive adhesive; second, because the protective film has a certain The thickness of the conductive paste after the protective film is removed, the conductive paste in the perforation will form a certain thickness of the protrusion, and the protrusion formed by the conductive paste in the printed circuit board sub-board and other printing will be produced in the subsequent production of the printed circuit board.
  • the insulating layer further comprises a second insulating substrate, then: before step 11, the method Also includes the following steps Step:
  • the first insulating substrate and the second insulating substrate are bonded together, wherein the resin in the second insulating substrate is in a C-stage (ie, a fully cured state), and the temperature of the bonding treatment is lower than The glass transition temperature of the resin in the first insulating substrate.
  • the temperature of the bonding treatment is preferably higher than normal temperature, but lower than the glass transition temperature (TG) of the resin in the insulating substrate, so that the resin in the first insulating substrate is heated during the bonding process.
  • TG glass transition temperature
  • the glass transition temperature (TG) is an important characteristic parameter of the material, and many properties of the material change sharply around the glass transition temperature.
  • the insulating substrate first softens, and when the temperature rises to the glass transition temperature of the resin in the insulating substrate, a curing reaction occurs and the process is irreversible, i.e., the shape is not changed by heating again after cooling.
  • the resin can be divided into ordinary TG resin and high TG resin, ordinary TG > 130 degrees, high TG > 170 degrees. Therefore, the temperature of the bonding treatment is preferably higher than 60 °C, and for the resin of the ordinary material, the temperature of the bonding treatment should be lower than 125 °C.
  • the bonding process of the first insulating substrate and the second insulating substrate may be performed by a vacuum filming method.
  • the thickness of the first insulating substrate is selected according to the requirements of the process design of the printed circuit board daughter board, and the second insulating substrate is mainly used as a protective layer, and the thickness thereof can be as thin as 10 micrometers to 20 micrometers, usually less than The thickness of the first insulating substrate. Moreover, since most of the components of the second insulating substrate are resins, the composition of the glass fibers is close to zero, so the toughness and hardness are poor, and in practice, it is also required to be combined with the first insulating substrate (high toughness and thickness). The formation of a line pattern on the second insulating substrate is facilitated.
  • a conductive line is formed by an additive method.
  • a conductive line pattern is formed by an additive method.
  • step 12 the drilling process is performed at a preset position on the other side of the insulating layer, and specifically includes:
  • a drilling process is performed on a predetermined position on the first insulating substrate in the insulating layer to obtain a through hole penetrating the first insulating substrate and the second insulating substrate.
  • the method further includes:
  • a protective film is bonded to the first insulating substrate in the insulating layer, and the temperature of the bonding treatment is lower than the glass transition temperature of the resin in the first insulating substrate.
  • drilling processing is performed on a preset position on the other side of the insulating layer, specifically comprising: performing drilling processing on a predetermined position on the protective film to obtain a through-protective film, a first insulating substrate, and The perforation of the second insulating substrate.
  • the method further includes:
  • the protective film on the first insulating substrate is removed.
  • the insulating layer only includes the first insulating substrate, and is fabricated on one surface of the first insulating substrate during fabrication.
  • a conductive circuit pattern is formed by an additive method, a drilling process is performed at a predetermined position on the other surface, and a conductive paste is filled in the obtained through hole to form a printed circuit board daughter board; and another manufacturing method is that the insulating layer includes a bonding layer.
  • a first insulating substrate and a second insulating substrate together, and at the time of fabrication, a conductive line pattern is formed on the surface of the second insulating substrate by an additive method, and the surface of the first insulating substrate is preset Drilling is performed at the position and the obtained perforations are filled with a conductive paste to form a printed circuit board daughter board.
  • the manufacturing process of the printed circuit board sub-board provided by the embodiment of the invention is simple.
  • the printed circuit board sub-board provided by the embodiment of the invention can form a multilayer printed circuit board with any layer conduction only by one press-fitting process, thereby shortening the process flow, reducing the production cycle and improving the manufacturing.
  • the resin in the first insulating substrate in the printed circuit board daughter board provided by the embodiment of the present invention is in the B stage, when the multilayer printed circuit board is formed, since no additional prepreg is needed for bonding, Therefore, the thickness of the obtained multilayer printed circuit board is made thinner; in addition, the printed circuit board daughter board provided by the embodiment of the present invention performs pattern transfer by the additive method to form a conductive line, so that the printed circuit board is obtained.
  • the board has a smaller line width and line spacing.
  • the insulating layer only includes the first insulating substrate (the resin in the first insulating substrate is in the B stage), as shown in FIG. 2, the printed circuit board daughter board provided in this embodiment
  • the manufacturing method includes the following steps: Step 21: bonding a protective film 2 and a thousand film 3 on the upper surface and the lower surface of the first insulating substrate 11, respectively, as shown in FIG. 3A, wherein the temperature of the bonding process is lower than the first a glass transition temperature of a resin in an insulating substrate 11;
  • Step 22 On the first insulating substrate 11, a conductive circuit pattern is formed by an additive method to obtain a circuit layer of the printed circuit board sub-board, specifically:
  • the film 3 on the first insulating substrate 11 is exposed and developed, as shown in FIG. 3B; then, pattern plating is performed on the side of the first film of the first insulating substrate 11, see FIG. 3C. Finally, the thousand film 3 is removed, thereby obtaining the circuit layer 4 of the printed circuit board daughter board, as shown in FIG. 3D; Step 23, drilling at a preset position on the protective film 2 of the first insulating substrate 11. Hole processing, obtaining a through hole M penetrating the protective film 2 and the first insulating substrate 11, as shown in FIG. 3E;
  • Step 24 filling the conductive paste 5 in the through hole M, as shown in FIG. 3F;
  • Step 25 removing the protective film 2 on the first insulating substrate 11 to obtain a printed circuit board daughter board, as shown in Fig. 3G.
  • the insulating layer is composed of a first insulating substrate (the resin in the first insulating substrate is in the B-stage) And the second insulating substrate (the resin in the second insulating substrate is in the C stage) is attached.
  • the manufacturing method of the printed circuit board sub-board provided by the embodiment includes the following steps:
  • Step 41 bonding the protective film 2 to the surface of the first insulating substrate 11 of the insulating layer, and bonding the film 3 on the surface of the second insulating substrate 12 of the insulating layer, as shown in FIG. 5A, wherein The temperature of the bonding treatment is lower than the glass transition temperature of the resin in the first insulating substrate 11;
  • Step 42 On the second insulating substrate 12 of the insulating layer, a conductive circuit pattern is formed by an additive method to obtain a circuit layer of the printed circuit board sub-board, specifically:
  • the film 3 on the second insulating substrate 12 is exposed and developed, as shown in FIG. 5B; then, pattern plating is performed on the side of the second film of the second insulating substrate 12, see FIG. 5C. Finally, the thousand film 3 is removed, thereby obtaining the wiring layer 4 of the printed circuit board daughter board, as shown in FIG. 5D; Step 43, the preset on the protective film 2 of the first insulating substrate 11 of the insulating layer The position is subjected to a drilling process to obtain a through hole M penetrating the protective film 2, the first insulating substrate 11 and the second insulating substrate 12, as shown in FIG. 5E; Step 44, filling the conductive paste 5 in the through hole M, see Figure 5F;
  • Step 45 removing the protective film 2 on the first insulating substrate 11 to obtain a printed circuit board daughter board, as shown in Fig. 5G.
  • the insulating layer in the printed circuit board sub-board provided by the embodiment of the invention comprises at least a first insulating substrate whose resin is in the B-stage, the manufacturing process is single, and the insulating layer of the printed circuit board sub-board has adhesiveness.
  • a method for manufacturing a printed circuit board includes the following steps: Step 61: Stacking a board, stacking at least two printed circuit board sub-boards in a preset order, the printing
  • the circuit board sub-board is the printed circuit board sub-board provided by the embodiment of the invention, and one of the two adjacent printed circuit board sub-boards, the circuit layer of one printed circuit board sub-board is insulated from the other printed circuit board sub-board Laminated together;
  • Step 62 Pressing and processing, pressing the printed circuit board sub-board after lamination processing to obtain a multi-layer printed circuit board, wherein the temperature of the pressing process reaches the first insulating base in the printed circuit board sub-board
  • the glass transition temperature of the resin in the material causes the resin in the first insulating substrate to be cured after the pressing treatment, that is, from the B phase (semi-cured state) to the C phase (completely cured state), thereby bringing the adjacent two The printed circuit board daughter boards are bonded together.
  • two adjacent printed circuit board sub-boards can be bonded together through the first insulating substrate included in each printed circuit board sub-board, without requiring additional
  • the prepreg bonds the adjacent two printed circuit board daughter boards together, so that the thickness of the formed printed circuit board is greatly reduced; since the multilayer printed circuit board is formed by any one pressing process, any layer is formed. Therefore, the process flow is reduced, the production cycle is reduced, and the manufacturing precision is also improved.
  • the stack processing in step 61 may also be:
  • the at least two printed circuit board daughter boards and the metal foil are stacked in a predetermined order, wherein the metal foil is located at the outermost layer and is laminated with the insulation of the printed circuit board daughter board. Further, after step 62, the method further includes:
  • the metal foil of the outermost layer of the printed circuit board is transferred by a pattern to obtain a conductive circuit pattern of the outermost layer of the printed circuit board.
  • the metal foil may be a copper foil or a film made of other conductive metals.
  • the following examples are described by taking a 6-layer PCB as an example. The manufacturing method of other layers of PCB is similar, and is not listed here.
  • Embodiment 3 The PCB is fabricated by five first printed circuit board sub-boards and a metal foil as shown in FIG. 3G.
  • the specific manufacturing method is shown in FIG. 7, and includes the following steps:
  • Step 71 stacking processing, combining the first printed circuit board sub-board and the metal foil in a predetermined order, as shown in FIG. 8A, wherein one of the adjacent two printed circuit board sub-boards
  • the first insulating substrate of the printed circuit board sub-board is laminated with the circuit of the other printed circuit board sub-board, the metal foil is located at the outermost layer and is overlapped with the first insulating substrate of the printed circuit board sub-board;
  • Step 72 press-bonding to obtain a desired printed circuit board, as shown in FIG. 8B, wherein the temperature of the press-bonding treatment reaches the glass transition temperature of the resin in the first insulating substrate;
  • Step 73 According to the requirements of the board, the outermost metal foil is transferred by a pattern to form a wiring layer having a conductive line, thereby obtaining a 6-layer PCB, as shown in FIG. 8C.
  • Embodiment 4 The PCB is fabricated from five second printed circuit board sub-boards and a metal foil as shown in FIG. 5G.
  • the specific manufacturing method is shown in FIG. 9, and includes the following steps:
  • Step 91 Stacking, stacking the second printed circuit board sub-board and the metal foil in a predetermined order, as shown in FIG. 10A, wherein one of the adjacent two printed circuit board sub-boards The first insulating substrate of the printed circuit board sub-board is laminated with the circuit of the other printed circuit board sub-board, the metal foil is located at the outermost layer and is overlapped with the first insulating substrate of the printed circuit board sub-board;
  • Step 92 press-bonding to obtain a desired printed circuit board, as shown in FIG. 10B, wherein the temperature of the press-bonding treatment reaches the glass transition temperature of the resin in the first insulating substrate;
  • Step 93 According to the requirements of the board, the outermost metal foil is transferred by a pattern to form a wiring layer having a conductive line, thereby obtaining a 6-layer PCB, as shown in FIG. 10C.
  • a printed circuit board structure is also provided, the printed circuit board comprising at least one printed circuit board daughter board, wherein:
  • the printed circuit board sub-board includes an insulating layer and a circuit layer on one side of the insulating layer;
  • the insulating layer includes at least a first insulating substrate, and the insulating layer is provided with a through hole penetrating the insulating layer, wherein the through hole is formed by drilling a hole from the other side of the insulating layer, and the through hole is filled with a conductive paste.
  • the printed circuit board comprises at least one printed circuit board daughter board;
  • the printed circuit board sub-board includes an insulating layer and a circuit layer on one side of the insulating layer;
  • the insulating layer includes a first insulating substrate, and the insulating layer is provided with a through hole penetrating the first insulating substrate, wherein: a wiring layer of the printed circuit board daughter board is formed on one side of the first insulating substrate, The perforation is formed by drilling a hole from the other side of the first insulating substrate, and the perforation is filled with a conductive paste.
  • the printed circuit board comprises at least one printed circuit board daughter board;
  • the printed circuit board sub-board includes an insulating layer and a circuit layer on one side of the insulating layer;
  • the insulating layer includes a first insulating substrate, a second insulating substrate on one side of the first insulating substrate, and a through hole penetrating the first insulating substrate in the insulating layer, wherein: the printing a circuit layer of the circuit board sub-board is formed on the second insulating substrate, the perforation is formed by drilling from the other side of the first insulating substrate, the perforation penetrating through the first insulating substrate and the second insulating substrate The perforation is filled with a conductive paste.
  • the thickness of the conductive paste filled in the perforations is greater than the thickness of the insulating layer.
  • the thickness of the conductive paste in the through hole is greater than the thickness of the first insulating substrate; for the second preferred structure, the thickness of the conductive paste in the through hole is greater than that of the first insulating substrate and The sum of the thicknesses of the second insulating substrate.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
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Abstract

一种印制电路板子板及印制电路板的制造方法和印制电路板。印制电路板子板的制造方法包括:在绝缘层的一侧,采用加成法制作导电线路图形,得到印制电路板子板的线路层,绝缘层至少包括第一绝缘基材,且第一绝缘基材中的树脂处于B阶段;在绝缘层的另一侧的预设位置进行钻孔处理,得到贯穿绝缘层的穿孔;在穿孔内填塞导电胶,得到印制电路板子板。采用这种印制电路板子板,只需一次压合处理即可形成任意层导通的多层印制电路板,从而简化了工艺流程,降低了生产周期,提高了制造精度;另外,由于不需要额外的半固化片进行粘接,制得的多层印制电路板的厚度更薄。

Description

印制电路板子板及印制电路板的制造方法和印制电路板 本申请要求在 2013年 7月 24日提交中国专利局、 申请号为 201310313915.3、 发明名 称为"印制电路板子板及印制电路板的制造方法和印制电路板 "的中国专利申请的优先权, 其全部内容通过引用结合在本申请中。 技术领域
本发明涉及印制电路板技术领域, 特别涉及一种印制电路板(Printed Circuit Board, PCB )子板及印制电路板的制造方法和印制电路板。 背景技术
近年来, 随着电子技术的飞速发展, 电子产品不断朝着小型化、 轻量化、 高速化、 多 功能化及高可靠性的方向发展 , 使得电子产品中的半导体部件等也朝着多引脚化和细间距 化发展。 面对这种发展趋势, 要求承载半导体部件的 PCB也朝着小型化、 轻量化和高密度 化的方向发展。为了满足这种要求,研制和开发了高密度互连( High Density Interconnection, HDD PCB , 但釆用常规制造工艺生产的高密度 PCB已越来越难于满足半导体和电子产品 的发展需求, 因此迫切需要提升现有高密度 PCB板的制造工艺,使其满足更高密度的层间 互连。
任意层互连( Every Layer Interconnection, ELIC )技术因其具有更高连接密度而得到 迅速的发展。釆用 ELIC技术制备而成的 PCB称为任意层高密度互连印制电路板,即 ELIC PCB。 目前, 多层任意层互连印制电路板在制备过程中, 任意相邻的两个内层芯板之间需 要压合半固化片, 以使该相邻的两个内层芯板粘合在一起, 内层芯板与外层芯板(或金属 箔)之间也需要压合半固化片, 以使内层芯板与外层芯板粘合在一起, 在制备过程中, 需 要经过多次压合处理, 才能形成多层任意层互连印制电路板, 因此, 制备工艺复杂, 生产 周期长, 并且, 多次压合处理后各材料的涨缩变大, 导致对位精度低, 降低了成品良率。
综上所述, 现有的印制电路板的制造精度低, 工艺流程复杂, 生产周期长。 发明内容
本发明实施例提供了一种印制电路板子板及印制电路板的制造方法和印制电路板, 用 于解决现有的印制电路板的制造精度低, 工艺流程复杂, 生产周期长的问题。
本发明实施例提供了一种印制电路板子板的制造方法, 该方法包括:
在绝缘层的一侧, 釆用加成法制作导电线路图形, 得到印制电路板子板的线路层, 其 中, 所述绝缘层至少包括第一绝缘基材, 且所述第一绝缘基材中的树脂处于 B阶段; 在所述绝缘层的另一侧的预设位置进行钻孔处理, 得到贯穿所述绝缘层的穿孔; 在所述穿孔内填塞导电胶, 得到所述印制电路板子板。
优选的, 所述绝缘层还包括第二绝缘基材, 则在所述制作导电线路图形之前, 所述方 法进一步包括:
将所述第一绝缘基材与所述第二绝缘基材贴合在一起, 其中, 所述第二绝缘基材中的 树脂处于 C阶段, 所述贴合处理的温度低于所述第一绝缘基材中的树脂的玻璃化温度。
进一步, 所述制作导电线路图形, 具体包括:
在所述绝缘层的第二绝缘基材上制作导电线路图形;
在所述绝缘层的另一侧的预设位置进行钻孔处理, 得到贯穿所述绝缘层的穿孔具体包 括:
在所述绝缘层的第一绝缘基材上的预设位置进行钻孔处理, 得到贯穿所述第一绝缘基 材及所述第二绝缘基材的穿孔。
在实施中, 在所述制作导电线路图形之前, 所述方法还包括: 在所述绝缘层的另一侧 贴合保护膜, 所述贴合处理的温度低于所述第一绝缘基材中的树脂的玻璃化温度;
在所述绝缘层的另一侧的预设位置进行钻孔处理, 得到贯穿所述绝缘层的穿孔, 具体 包括: 在所述保护膜上的预设位置进行钻孔处理, 得到贯穿所述保护膜和所述绝缘层的穿 孔;
在所述穿孔内填塞导电胶之后, 所述方法还包括: 去除所述保护膜。
本发明实施例提供了一种印制电路板的制造方法, 该方法包括:
叠板处理, 将至少两个印制电路板子板按照预设顺序进行叠板, 所述印制电路板子板 为由上述方法制造而成的, 且任意两个相邻的印制电路板子板中, 一个所述印制电路板子 板的线路层与另一个所述印制电路板子板的绝缘层叠合在一起;
压合处理, 将叠板处理后的印制电路板子板进行压合处理, 得到多层印制电路板, 其 中, 所述压合处理的温度达到所述印制电路板子板中的第一绝缘基材中的树脂的玻璃化温 度。
优选的, 所述叠板处理具体包括:
将至少两个所述印制电路板子板以及金属箔按照预设顺序进行叠板, 其中, 所述金属 箔位于最外层且与所述印制电路板子板的绝缘层叠合在一起。
进一步, 所述压合处理之后, 所述方法还包括:
对所述印制电路板最外层的金属箔进行图形转移, 得到所述印制电路板的最外层的导 电线路图形。
本发明实施例提供了印制电路板, 所述印制电路板包含至少一个印制电路板子板, 其 中: 所述印制电路板子板包括绝缘层, 以及位于所述绝缘层一侧的线路层; 所述绝缘层至少包括第一绝缘基材, 以及所述绝缘层中设置有贯穿所述绝缘层的穿 孔, 其中, 所述穿孔是从所述绝缘层的另一侧进行钻孔而形成的, 所述穿孔内填有导电胶。
优选的, 所述穿孔内填充的导电胶的厚度大于所述绝缘层的厚度。
进一步, 所述绝缘层还包括位于所述第一绝缘基材的一侧的第二绝缘基材; 其中: 所述印制电路板子板的线路层形成在所述第二绝缘基材上, 所述穿孔是从所述第一绝 缘基材的另一侧进行钻孔而形成的, 所述穿孔贯穿所述第一绝缘基材和所述第二绝缘基 材。
本发明实施例中, 在绝缘层的一侧, 釆用加成法制作导电线路图形, 得到印制电路板 子板的线路层, 其中, 该绝缘层至少包括第一绝缘基材, 且第一绝缘基材中的树脂处于 B 阶段; 在绝缘层的另一侧的预设位置进行钻孔处理, 得到贯穿该绝缘层的穿孔; 在该穿孔 内填塞导电胶, 得到印制电路板子板, 因此, 本发明实施例提供的印制电路板子板的制作 工艺筒单。 釆用本发明实施例提供的印制电路板子板, 只需一次压合处理即可形成任意层 导通的多层印制电路板, 从而筒化了工艺流程, 降低了生产周期, 提高了制造精度; 另夕卜, 由于本发明实施例提供的印制电路板子板中的第一绝缘基材中的树脂处于 B阶段,在形成 多层印制电路板时, 由于不需要额外的半固化片进行粘接, 使制得的多层印制电路板的厚 度更薄。 附图说明
图 1为本发明实施例提供的印制电路板子板的制造方法流程图;
图 2为本发明实施例提供的第一种印制电路板子板的制造方法流程图;
图 3 A〜图 3G为本发明实施例提供的第一种印制电路板子板釆用图 2的方法制造过程 中的剖面结构示意图;
图 4为本发明实施例提供的第二种印制电路板子板的制造方法流程图;
图 5A〜图 5G为本发明实施例提供的第二种印制电路板子板釆用图 4的方法制造过程 中的剖面结构示意图;
图 6本发明实施例提供的印制电路板的制造工艺流程图;
图 7为本发明实施例提供的第一种印制电路板的制造工艺流程图;
图 8A〜图 8C为本发明实施例第一种印制电路板在制造过程中的剖面结构示意图; 图 9为本发明实施例提供的第二种印制电路板的制造工艺流程图;
图 10A〜图 10C为本发明实施例提供的第二种印制电路板在制造过程中的剖面结构示 意图。 具体实施方式
本发明实施例制备的印制电路板子板为中间态 (即半成品), 而非终态 (即成品), 该 印制电路板子板主要用于在制备 PCB时作为 PCB的中间层, 并与其他层结构(如金属箔) 叠合在一起, 经压合处理后得到所需的 PCB (即成品)。
对于印制电路板来说, 通孔是指为了实现印制电路板的不同线路层间的电气连接而设 置的贯穿印制电路板不同线路层之间的孔, 一般在制作印制电路板之前, 会先根据该印制 电路板的电气连接要求, 预先设定该印制电路板中用于实现不同线路层间电气连接的通孔 的位置及孔径大小, 进而在制作该印制电路板时, 在各印制电路板子板中预设位置对应的 位置上进行钻孔处理, 以形成所需的通孔。
随着科技的进步,必然会产生出全由更高密度制造方法来生产的 HDI板, 即无 "芯板" 技术, 其特点是不使用 "芯板"且不需要对孔进行金属化电镀方式来实现 PCB层间电气互 连。 无 "芯板" 任意层互连电路板具有厚度更薄、 尺寸更小等特点, 由于其信号传输线相 比于传统的任意层互连电路板的信号传输线大大缩短, 从而极大的改善了电子产品的性能 和可靠性。 无"芯板"将会成为任意层互连技术的发展趋势。 本发明实施例提供了一种用于 制作无 "芯板" 任意层互连电路板的印制电路板子板的制造方法, 以及由至少两个该印制 电路板子板经一次压合处理制备而成的印制电路板。
下面结合说明书附图对本发明实施例作进一步详细描述。
参见图 1所示, 本发明实施例提供了一种印制电路板子板的制造方法, 该方法包括以 下步骤:
步骤 11、 在绝缘层的一侧, 釆用加成法制作导电线路图形, 得到印制电路板子板的线 路层, 其中, 该绝缘层至少包括第一绝缘基材, 该第一绝缘基材中的树脂处于 B 阶段 ( B-stage, 即半固化状态)。
具体的, 首先, 在绝缘层的一个表面贴合千膜; 然后, 在千膜上进行曝光、 显影处理; 接着, 釆用加成法, 在绝缘层上制作导电线路图形; 最后, 去除绝缘层上的千膜。 由于本 发明实施例中, 釆用加成法在绝缘层的一侧制作线路层, 相比于减成法, 制作出的线路更 为精细, 一般能达到小于 30 米的线宽间距, 而减成法能达到的最小线宽间距为 40~50 微米。
优选的, 第一绝缘基材可以是环氧树脂玻纤布基板、 芳香族聚酰胺树脂纤维的织布、 环氧树脂无纺布基板、 聚酰亚胺树脂基板、 聚四氟乙烯树脂基板、 聚苯醚树脂基板、 聚苯 醚树脂基板、 氰酸酯树脂基板或双马来酰亚胺改性三嗪树脂基板等, 其中第一绝缘基材中 的树脂处于 B阶段 (即半固化状态)。
步骤 12、 在该绝缘层的另一侧(即与制作线路层相反的一侧的表面)的预设位置进行 钻孔处理, 得到贯穿该绝缘层的穿孔。 其中, 预设位置为该绝缘层上与该绝缘层所属的印制电路板子板中需要与所制作的印 制电路板的其他子板的线路层连接的通孔对应的位置。
进一步, 钻孔处理包括激光钻孔、 机械钻孔或冲孔等; 其中, 激光钻孔进一步包括红 外激光钻孔及紫外激光钻孔。
优选的, 本发明实施例钻孔处理为激光钻孔, 从而更容易控制孔深。
步骤 13、 在步骤 12形成的穿孔内填塞导电胶, 得到印制电路板子板。
优选的, 导电胶(也称为导电膏) 包括但不限于下列中的一种或至少两种组成的混合 物: 铜膏、 银膏、 碳膏等。
在实施中, 步骤 13中, 在穿孔内填塞导电胶可以釆用手动塞孔、 半自动印刷机塞孔、 全自动印刷机塞孔或真空塞孔机塞孔。
在实施中, 为了在电镀处理时, 仅在该绝缘层的需要制作线路层的一侧被电镀, 而另 一侧不被电镀, 以及在印制电路板子板的制作过程中保护第一绝缘基材不会因受到外界的 侵蚀而受损, 优选的, 步骤 11之前, 该方法还包括:
在该绝缘层的另一侧 (即与线路层相对的表面)贴合保护膜, 该贴合处理的温度低于 第一绝缘基材中的树脂的玻璃化温度。
相应的, 步骤 12 中, 在绝缘层的另一侧 (即与线路层相对的表面) 的预设位置进行 钻孔处理, 得到贯穿该绝缘层的穿孔, 具体包括:
在保护膜上的预设位置进行钻孔处理, 得到贯穿保护膜和绝缘层的穿孔。
相应的, 步骤 13之后, 该方法还包括:
去除绝缘层上的保护膜。
优选的, 该保护膜可以为聚酯保护膜、 聚酰亚胺保护膜或千膜等。
进一步, 若保护膜为千膜, 则可以通过碱性溶液去除该保护膜; 若保护膜为聚酯保护 膜或聚酰亚胺保护膜, 则可以通过手动方式去除该保护膜。
在印制电路板子板的制作过程中, 由于在绝缘层的与线路层相对的表面贴合了保护 膜, 不仅在电镀处理时能够保护该绝缘层的另一侧不被电镀, 以及在制作过程中保护第一 绝缘基材不会因受到外界的侵蚀而受损, 而且还能起到以下作用: 一是在填塞穿孔的过程 中, 溢出的导电胶会残留在该保护膜上, 而不会残留在绝缘层上, 在制作完成后, 去除该 保护膜, 即可将残留的导电胶清除,从而保证了印制电路板子板的表面不会被导电胶污染; 二是, 由于保护膜具有一定的厚度, 在去除保护膜后, 穿孔中的导电胶会形成一定厚度的 凸起, 在后续制作印制电路板时, 通过该印制电路板子板中的导电胶形成的凸起与其他印 制电路板子板中的导电胶或其他导电材料连接, 能够提高印制电路板层间的连接可靠性。
在制作导电线路图形的过程中, 为了避免第一绝缘基材的形成线路层的一侧受到药水 的侵蚀, 优选的, 该绝缘层还包括第二绝缘基材, 则: 步骤 11之前, 该方法还包括如下步 骤:
将第一绝缘基材与第二绝缘基材贴合在一起, 其中, 该第二绝缘基材中的树脂处于 C 阶段(C-stage , 即完全固化状态), 该贴合处理的温度低于第一绝缘基材中的树脂的玻璃 化温度。
具体的,贴合处理的温度宜高于常温,但低于绝缘性基材中的树脂的玻璃化温度( TG ), 从而在贴合处理的过程中, 第一绝缘基材中的树脂经升温软化而更好地贴合在第二绝缘基 材的表面, 并由于贴合处理的温度低于该第一绝缘基材中树脂的玻璃化温度, 使其仍处于 B阶段, 即不会发生固化, 便于下一步压合固化。
其中, 玻璃化温度(TG )是材料的一个重要特性参数, 材料的许多特性都在玻璃化转 变温度附近发生急剧的变化。 随着温度的升高, 绝缘基材先逐渐软化, 当温度升至该绝缘 基材中树脂的玻璃化温度时发生固化反应并且该过程不可逆, 即冷却后再次加热不会发生 形状的改变。按玻璃化温度高低,可将树脂分为普通 TG树脂和高 TG树脂,普通 TG > 130 度, 高 TG > 170度。 所以贴合处理的温度优选高于 60 °C , 而针对普通材料的树脂, 贴合 处理的温度应低于 125 °C。
优选的, 第一绝缘基材与第二绝缘基材的贴合处理可以釆用真空贴膜方式。
在实施中, 第一绝缘基材的厚度依据该印制电路板子板的工艺设计的要求选取, 而第 二绝缘基材主要作为保护层, 其厚度可以薄至 10微米〜 20微米, 通常都小于第一绝缘基材 的厚度。 且因第二绝缘基材的成分绝大部分为树脂, 玻璃纤维的成分接近于零, 所以其韧 性和硬度较差, 实际中也需与第一绝缘基材(韧性和厚度较大)相结合, 便于第二绝缘基 材上线路图形的形成。
在实施中,若该绝缘层是由第一绝缘基材与第二绝缘基材进行贴合处理而形成的,则: 步骤 11中, 在绝缘层的一侧, 釆用加成法制作导电线路图形, 具体包括:
在该绝缘层中的第二绝缘基材上, 釆用加成法制作导电线路图形。
步骤 12中, 在绝缘层的另一侧的预设位置进行钻孔处理, 具体包括:
在该绝缘层中的第一绝缘基材上的预设位置进行钻孔处理, 得到贯穿第一绝缘基材及 第二绝缘基材的穿孔。
若该绝缘层是由第一绝缘基材与第二绝缘基材进行贴合处理而形成的, 优选的, 步骤 11之前, 该方法还包括:
在该绝缘层中第一绝缘基材上贴合保护膜, 该贴合处理的温度低于第一绝缘基材中的 树脂的玻璃化温度。
相应的, 步骤 12中, 在绝缘层的另一侧的预设位置进行钻孔处理, 具体包括: 在保护膜上的预设位置进行钻孔处理, 得到贯穿保护膜、 第一绝缘基材及第二绝缘基 材的穿孔。 相应的, 步骤 13之后, 该方法还包括:
去除第一绝缘基材上的保护膜。
本发明实施例中, 提供了两种印制电路板子板的制造方法, 一种制造方法是绝缘层仅 包含第一绝缘基材, 在制作时, 在该第一绝缘基材的一个表面上釆用加成法制作导电线路 图形, 在另一个表面的预设位置进行钻孔处理并在得到的穿孔中填充导电胶, 从而形成印 制电路板子板; 另一种制造方法是绝缘层包含贴合在一起的第一绝缘基材及第二绝缘基 材, 在制作时, 在该第二绝缘基材的表面上釆用加成法制作导电线路图形, 在第一绝缘基 材的表面的预设位置上进行钻孔处理并在得到的穿孔中填充导电胶, 从而形成印制电路板 子板。
本发明实施例提供的印制电路板子板的制作工艺筒单。 釆用本发明实施例提供的印制 电路板子板, 只需一次压合处理即可形成任意层导通的多层印制电路板, 从而筒化了工艺 流程, 降低了生产周期, 提高了制造精度; 另外, 由于本发明实施例提供的印制电路板子 板中的第一绝缘基材中的树脂处于 B阶段, 在形成多层印制电路板时, 由于不需要额外的 半固化片进行粘接, 从而使制得的多层印制电路板的厚度更薄; 此外, 由于本发明实施例 提供的印制电路板子板釆用加成法进行图形转移来制作导电线路, 使得制得的印制电路板 具有更小的线宽、 线距。
下面结合具体实施例对本发明提供的两种印制电路板子板的结构及其制造方法进行 详细说明。
实施例一、 本实施例中, 绝缘层仅包含第一绝缘基材(该第一绝缘基材中的树脂处于 B阶段), 参见图 2所示, 本实施例提供的印制电路板子板的制造方法包括以下步骤: 步骤 21、 在第一绝缘基材 11的上表面及下表面分别贴合保护膜 2及千膜 3 , 参见图 3A所示, 其中, 贴合处理的温度低于该第一绝缘基材 11中的树脂的玻璃化温度;
步骤 22、 在第一绝缘基材 11上, 釆用加成法制作导电线路图形, 得到印制电路板子 板的线路层, 具体为:
首先, 对第一绝缘基材 11上的千膜 3进行曝光、 显影处理, 参见图 3B所示; 然后, 在第一绝缘基材 11的千膜 3—侧进行图形电镀处理, 参见图 3C所示; 最后, 去除千膜 3 , 从而得到该印制电路板子板的线路层 4, 参见图 3D所示; 步骤 23、 在该第一绝缘基材 11的保护膜 2上的预设位置进行钻孔处理, 得到贯穿该 保护膜 2及第一绝缘基材 11的穿孔 M, 参见图 3E所示;
步骤 24、 在该穿孔 M内填塞导电胶 5 , 参见图 3F所示;
步骤 25、 去除该第一绝缘基材 11上的保护膜 2 , 得到印制电路板子板, 参见图 3G所 示。
实施例二、 本实施例中, 绝缘层由第一绝缘基材 (该第一绝缘基材中的树脂处于 B阶 段)及第二绝缘基材(该第二绝缘基材中的树脂处于 C阶段)贴合而成, 参见图 4所示, 本实施例提供的印制电路板子板的制造方法包括以下步骤:
步骤 41、在该绝缘层的第一绝缘基材 11的表面贴合保护膜 2, 以及在该绝缘层的第二 绝缘基材 12的表面贴合千膜 3 , 参见图 5A所示, 其中, 贴合处理的温度低于该第一绝缘 基材 11中的树脂的玻璃化温度;
步骤 42、 在该绝缘层的第二绝缘基材 12上, 釆用加成法制作导电线路图形, 得到印 制电路板子板的线路层, 具体为:
首先, 对第二绝缘基材 12上的千膜 3进行曝光、 显影处理, 参见图 5B所示; 然后, 在第二绝缘基材 12的千膜 3—侧进行图形电镀处理, 参见图 5C所示; 最后, 去除千膜 3 , 从而得到该印制电路板子板的线路层 4, 参见图 5D所示; 步骤 43、 在该绝缘层的第一绝缘基材 11的保护膜 2上的预设位置进行钻孔处理, 得 到贯穿该保护膜 2、 第一绝缘基材 11及第二绝缘基材 12的穿孔 M, 参见图 5E所示; 步骤 44、 在该穿孔 M内填塞导电胶 5 , 参见图 5F所示;
步骤 45、 去除该第一绝缘基材 11上的保护膜 2 , 得到印制电路板子板, 参见图 5G所 示。
本发明实施例提供的印制电路板子板中的绝缘层至少包含其树脂处于 B阶段的第一绝 缘基材, 制造工艺筒单, 且该印制电路板子板的绝缘层具有粘结性。
参见图 6所示, 本发明实施例提供的印制电路板的制造方法, 包括以下步骤: 步骤 61、 叠板处理, 将至少两个印制电路板子板按照预设顺序进行叠板, 该印制电路 板子板为本发明实施例提供的印制电路板子板, 且任意两个相邻的印制电路板子板中, 一 个印制电路板子板的线路层与另一个印制电路板子板的绝缘层叠合在一起;
步骤 62、 压合处理, 将叠板处理后的印制电路板子板进行压合处理, 得到多层印制电 路板, 其中, 压合处理的温度达到印制电路板子板中的第一绝缘基材中的树脂的玻璃化温 度, 使得压合处理后第一绝缘基材中的树脂发生固化, 即由 B阶段(半固化状态)转化为 C阶段(完全固化状态), 从而将相邻的两个印制电路板子板粘合在一起。
本发明实施例提供的印制电路板在制作过程中, 可以通过各印制电路板子板包含的第 一绝缘基材将两个相邻的印制电路板子板粘合在一起, 不需要额外的半固化片将相邻的两 个印制电路板子板粘合在一起, 因此, 形成的印制电路板的厚度大大降低; 由于通过一次 压合处理即可形成任意层导通的多层印制电路板, 因此, 筒化了工艺流程, 降低了生产周 期, 也提高了制造精度。
优选的, 根据印制电路板的制板要求, 步骤 61中的叠板处理还可以为:
将至少两个印制电路板子板以及金属箔按照预设顺序进行叠板, 其中, 该金属箔位于 最外层且与印制电路板子板的绝缘层叠合在一起。 进一步, 在步骤 62之后, 该方法还包括:
对该印制电路板最外层的金属箔进行图形转移, 得到印制电路板的最外层的导电线路 图形。
优选的, 该金属箔可以为铜箔, 也可以为由其他导电金属制得的薄膜。 细说明, 以下实施例均以 6层 PCB为例进行说明的, 其他层数的 PCB的制造方法与其类 似, 此处不再——列举。
实施例三、 该 PCB由五个如图 3G所示的第一种印制电路板子板及一个金属箔制作而 成, 具体制造方法参见图 7所示, 包括以下步骤:
步骤 71、叠板处理,将第一种印制电路板子板及金属箔按照预设的顺序进行组合叠板, 参见图 8A所示, 其中, 相邻的两个印制电路板子板中, 一个印制电路板子板的第一绝缘 基材与另一个印制电路板子板的线路层叠合在一起, 金属箔位于最外层且与印制电路板子 板的第一绝缘基材叠合在一起;
步骤 72、 压合处理, 得到所需的印制电路板, 参见图 8B所示, 其中, 压合处理的温 度达到第一绝缘基材中的树脂的玻璃化温度;
步骤 73、 根据制板要求, 对最外层的金属箔进行图形转移, 形成具有导电线路的线路 层, 从而得到 6层 PCB , 参见图 8C所示。
实施例四、 该 PCB由五个如图 5G所示的第二种印制电路板子板及一个金属箔制作而 成, 具体制造方法参见图 9所示, 包括以下步骤:
步骤 91、叠板处理,将第二种印制电路板子板及金属箔按照预设的顺序进行组合叠板, 参见图 10A所示, 其中, 相邻的两个印制电路板子板中, 一个印制电路板子板的第一绝缘 基材与另一个印制电路板子板的线路层叠合在一起, 金属箔位于最外层且与印制电路板子 板的第一绝缘基材叠合在一起;
步骤 92、 压合处理, 得到所需的印制电路板, 参见图 10B所示, 其中, 压合处理的温 度达到第一绝缘基材中的树脂的玻璃化温度;
步骤 93、 根据制板要求, 对最外层的金属箔进行图形转移, 形成具有导电线路的线路 层, 从而得到 6层 PCB , 参见图 10C所示。 还提供了印制电路板的结构, 该印制电路板包含至少一个印制电路板子板, 其中:
印制电路板子板包括绝缘层, 以及位于绝缘层一侧的线路层;
绝缘层至少包括第一绝缘基材, 以及绝缘层中设置有贯穿该绝缘层的穿孔, 其中, 穿 孔是从绝缘层的另一侧进行钻孔而形成的, 该穿孔内填有导电胶。
作为一种优选的结构, 该印制电路板包含至少一个印制电路板子板; 该印制电路板子板包括绝缘层, 以及位于绝缘层一侧的线路层;
该绝缘层包括第一绝缘基材, 以及该绝缘层中设置有贯穿该第一绝缘基材的穿孔, 其 中: 该印制电路板子板的线路层形成在该第一绝缘基材的一侧, 该穿孔是从第一绝缘基材 的另一侧进行钻孔而形成的, 该穿孔内填有导电胶。
作为另一种优选的结构, 该印制电路板包含至少一个印制电路板子板;
该印制电路板子板包括绝缘层, 以及位于绝缘层一侧的线路层;
该绝缘层包括第一绝缘基材、 位于所述第一绝缘基材的一侧的第二绝缘基材、 以及该 绝缘层中设置有贯穿该第一绝缘基材的穿孔, 其中: 该印制电路板子板的线路层形成在第 二绝缘基材上, 所述穿孔是从第一绝缘基材的另一侧进行钻孔而形成的, 该穿孔贯穿第一 绝缘基材和第二绝缘基材, 该穿孔内填有导电胶。
基于上述两种优选结构, 穿孔内填充的导电胶的厚度大于绝缘层的厚度。
对于第一种优选结构来说, 该穿孔内的导电胶的厚度大于第一绝缘基材的厚度; 对于 第二种优选结构来说, 该穿孔内的导电胶的厚度大于第一绝缘基材和第二绝缘基材的厚度 之和。
尽管已描述了本发明的优选实施例, 但本领域内的技术人员一旦得知了基本创造性概 念, 则可对这些实施例作出另外的变更和修改。 所以, 所附权利要求意欲解释为包括优选 实施例以及落入本发明范围的所有变更和修改。
显然, 本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和 范围。这样,倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内, 则本发明也意图包含这些改动和变型在内。

Claims

权 利 要 求
1、 一种印制电路板子板的制造方法, 其特征在于, 该方法包括:
在绝缘层的一侧, 釆用加成法制作导电线路图形, 得到印制电路板子板的线路层, 其 中, 所述绝缘层至少包括第一绝缘基材, 且所述第一绝缘基材中的树脂处于 B阶段; 在所述绝缘层的另一侧的预设位置进行钻孔处理, 得到贯穿所述绝缘层的穿孔; 在所述穿孔内填塞导电胶, 得到所述印制电路板子板。
2、 如权利要求 1 所述的方法, 其特征在于, 所述绝缘层还包括第二绝缘基材, 则在 所述制作导电线路图形之前, 所述方法进一步包括:
将所述第一绝缘基材与所述第二绝缘基材贴合在一起, 其中, 所述第二绝缘基材中的 树脂处于 C阶段, 所述贴合处理的温度低于所述第一绝缘基材中的树脂的玻璃化温度。
3、 如权利要求 2所述的方法, 其特征在于, 所述制作导电线路图形, 具体包括: 在所述绝缘层的第二绝缘基材上制作导电线路图形;
在所述绝缘层的另一侧的预设位置进行钻孔处理, 得到贯穿所述绝缘层的穿孔具体包 括:
在所述绝缘层的第一绝缘基材上的预设位置进行钻孔处理, 得到贯穿所述第一绝缘基 材及所述第二绝缘基材的穿孔。
4、 如权利要求 1~3任一项所述的方法, 其特征在于, 在所述制作导电线路图形之前, 所述方法还包括:
在所述绝缘层的另一侧贴合保护膜, 所述贴合处理的温度低于所述第一绝缘基材中的 树脂的玻璃化温度;
在所述绝缘层的另一侧的预设位置进行钻孔处理, 得到贯穿所述绝缘层的穿孔, 具体 包括:
在所述保护膜上的预设位置进行钻孔处理, 得到贯穿所述保护膜和所述绝缘层的穿 孔;
在所述穿孔内填塞导电胶之后, 所述方法还包括:
去除所述保护膜。
5、 一种印制电路板的制造方法, 其特征在于, 该方法包括:
叠板处理, 将至少两个印制电路板子板按照预设顺序进行叠板, 所述印制电路板子板 为由权利要求 1~4任一方法制造而成的, 且任意两个相邻的印制电路板子板中, 一个所述 印制电路板子板的线路层与另一个所述印制电路板子板的绝缘层叠合在一起;
压合处理, 将叠板处理后的印制电路板子板进行压合处理, 得到多层印制电路板, 其 中, 所述压合处理的温度达到所述印制电路板子板中的第一绝缘基材中的树脂的玻璃化温 度。
6、 如权利要求 5所述的方法, 其特征在于, 所述叠板处理具体包括:
将至少两个所述印制电路板子板以及金属箔按照预设顺序进行叠板, 其中, 所述金属 箔位于最外层且与所述印制电路板子板的绝缘层叠合在一起。
7、 如权利要求 6所述的方法, 其特征在于, 所述压合处理之后, 所述方法还包括: 对所述印制电路板最外层的金属箔进行图形转移, 得到所述印制电路板的最外层的导 电线路图形。
8、 一种印制电路板, 其特征在于, 所述印制电路板包含至少一个印制电路板子板, 其巾:
所述印制电路板子板包括绝缘层, 以及位于所述绝缘层一侧的线路层;
所述绝缘层至少包括第一绝缘基材, 以及所述绝缘层中设置有贯穿所述绝缘层的穿 孔, 其中, 所述穿孔是从所述绝缘层的另一侧进行钻孔而形成的, 所述穿孔内填有导电胶。
9、 如权利要求 8 所述的印制电路板, 其特征在于, 所述穿孔内填充的导电胶的厚度 大于所述绝缘层的厚度。
10、 如权利要求 8或 9所述的印制电路板, 其特征在于, 所述绝缘层还包括位于所述 第一绝缘基材的一侧的第二绝缘基材; 其中:
所述印制电路板子板的线路层形成在所述第二绝缘基材上, 所述穿孔是从所述第一绝 缘基材的另一侧进行钻孔而形成的, 所述穿孔贯穿所述第一绝缘基材和所述第二绝缘基 材。
PCT/CN2013/087895 2013-07-24 2013-11-27 印制电路板子板及印制电路板的制造方法和印制电路板 WO2015010400A1 (zh)

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