WO2013161181A1 - 多層配線基板 - Google Patents
多層配線基板 Download PDFInfo
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- WO2013161181A1 WO2013161181A1 PCT/JP2013/001885 JP2013001885W WO2013161181A1 WO 2013161181 A1 WO2013161181 A1 WO 2013161181A1 JP 2013001885 W JP2013001885 W JP 2013001885W WO 2013161181 A1 WO2013161181 A1 WO 2013161181A1
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- WIPO (PCT)
- Prior art keywords
- conductor
- conformal
- layer
- multilayer wiring
- wiring board
- Prior art date
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
-
- 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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/02—Fillers; Particles; Fibers; Reinforcement materials
- H05K2201/0275—Fibers and reinforcement materials
- H05K2201/029—Woven fibrous reinforcement or textile
-
- 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
- H05K2201/09509—Blind vias, i.e. vias having one side closed
-
- 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
- H05K2201/0959—Plated through-holes or plated blind vias filled with insulating material
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/20—Details of printed circuits not provided for in H05K2201/01 - H05K2201/10
- H05K2201/2072—Anchoring, i.e. one structure gripping into another
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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
- H05K3/421—Blind plated via connections
Definitions
- the present invention relates to a multilayer wiring board having a structure in which a plurality of resin insulating layers and a plurality of conductor layers are alternately stacked to form a multilayer.
- a via conductor for connecting each conductor layer there are a filled via conductor and a conformal via conductor.
- the filled via conductor is a type of via in which the via hole formed in the resin insulation layer by the plating layer is completely filled and has no recess.
- a conformal via conductor refers to a via having a recess, in which a plating layer is formed along the shape of the via hole, and hence the via hole is not completely filled with the plating layer.
- an hourglass-shaped via hole is formed in the resin insulating layer so that the center in the thickness direction is reduced in diameter, and the via hole is filled with a filled via conductor.
- an inverted truncated cone shaped via hole is formed in the resin insulating layer so as to decrease in diameter from the upper surface to the lower surface, and a conformal via conductor is formed in the via hole. ing. Then, the recess inside the conformal via conductor is filled with a part of the upper resin insulating layer.
- the multilayer wiring board of Patent Document 2 has a core substrate, and a buildup layer is formed by alternately laminating a plurality of resin insulating layers and a plurality of conductor layers on the front and back surfaces of the core substrate. It is done.
- the core board is formed thicker than the resin insulation layer constituting the buildup layer. For this reason, a straight through hole is formed in the core substrate by drilling, and a through hole conductor is formed inside thereof.
- the conductor layers formed on the front and back surfaces of the core substrate are electrically connected by the through-hole conductors.
- the inside of the through hole conductor is filled with a closing body such as epoxy resin, for example.
- JP 2011-205069 A JP, 2008-141136, A
- the via hole of the resin insulating layer is usually formed by laser hole processing and has a shape which is reduced in diameter in one direction. Further, when forming a conformal via conductor in the via hole, plating conditions are set such that a plating layer is formed on the inner wall surface of the via hole with a uniform thickness.
- the recess formed inside the conformal via conductor has a shape in which the diameter gradually widens toward the opening side. Therefore, if the recess is filled with the resin insulation layer, sufficient adhesion between the insulation layer and the via conductor can not be obtained, and the reliability is lowered. Also, the through hole conductor is formed in a straight through hole. Therefore, even through-hole conductors, the closures filled inside can not obtain sufficient adhesion.
- the present invention has been made in view of the above problems, and an object thereof is to provide a multilayer wiring board capable of sufficiently securing the adhesion strength between a conformal conductor and a resin insulation layer.
- At least one layer of the resin insulation layer contains the inorganic fiber cloth in the inner layer portion of the resin insulation material, and the inner wall surface of the through hole provided in the resin insulation layer is the tip of the inorganic fiber constituting the inorganic fiber cloth
- a protruding portion may be formed, and the anchor portion may be narrowed at a position corresponding to the protruding portion.
- the conformal conductor is securely fixed by the projection of the inorganic fiber cloth, so that the conformal conductor can be prevented from falling out of the through hole.
- the anchor portion is latched to the conformal conductor by the thin and narrow shape, peeling of the resin insulating layer can be reliably prevented.
- the anchor portion can be fixed to the inside of the conformal conductor without including the inorganic fiber cloth in the inner layer portion of the resin insulating material, the structure in which the tip of the inorganic fiber is protruded from the inner wall surface of the through hole By doing this, the strength of the portion in contact with the anchor portion can be increased, and the anchor portion can be more reliably fixed.
- the through hole may have the smallest opening diameter defined by the protrusion of the inorganic fiber cloth. In this way, the conformal conductor can be reliably fixed by the projection of the inorganic fiber cloth in the through hole.
- the conformal conductor may be formed with a uniform thickness along the inner wall surface of the through hole, or the thickness of the lower portion in contact with the lower end of the anchor portion is thinner than the upper portion. It is also good.
- the conformal conductor may bulge radially inward of the through hole at a substantially central portion in the through direction of the through hole. In this way, the space of the lower portion can be widely secured inside the conformal conductor, and the anchor portion in which the lower end side bulges can be reliably formed.
- the lower end side of the anchor portion may be thick as long as an anchor effect can be obtained, and the thickness is not particularly limited.
- the lower end side of the anchor portion may be expanded so as to have a thickness twice or more that of the narrow and narrow portion. In this way, the anchor portion can be more reliably fixed inside the conformal conductor.
- a conformal conductor is a conductor formed with a predetermined thickness along a shape of a through hole in a through hole which penetrates one or more resin insulating layers.
- Specific examples of the conformal conductor include a conformal via conductor and a through hole conductor.
- a conformal conductor is usually formed by a copper plating layer.
- a conformal conductor may be formed of a plating layer other than copper (for example, a nickel plating layer or a gold plating layer), or a method other than plating, for example, a conformal conductor by a method such as filling of a conductor paste. May be formed.
- the resin insulation material which comprises a resin insulation layer can be suitably selected in consideration of insulation, heat resistance, moisture resistance, etc.
- Preferred examples of the resin insulating material include thermosetting resins such as epoxy resin, phenol resin, urethane resin, silicone resin, and polyimide resin, and thermoplastic resins such as polycarbonate resin, acrylic resin, polyacetal resin, and polypropylene resin. .
- the anchor portion is formed by filling a part of the resin insulating layer on the upper layer side inside the conformal conductor.
- the lower end side of the anchor portion bulges outward in the radial direction of the through hole than the upper end side.
- the anchor portion functions as a weir and is fixed to the inside of the conformal conductor with certainty, so peeling of the resin insulation layer on the top of the conformal conductor can be reliably prevented.
- FIG. 2 is a cross-sectional view showing a schematic configuration of a multilayer wiring board in the present embodiment.
- the expanded sectional view which shows the via hole and via conductor in a resin insulation layer.
- Explanatory drawing which shows the core board
- Explanatory drawing which shows the insulating layer arrangement
- Explanatory drawing which shows the via-hole formation process in the manufacturing method of a multilayer wiring board.
- Explanatory drawing which shows the microscope picture of the via hole of this Embodiment, and a via conductor. Sectional drawing which shows the via conductor in another embodiment.
- the multilayer wiring board 10 includes a core substrate 11 and a first buildup layer 31 formed on the core main surface 12 (upper surface in FIG. 1) of the core substrate 11.
- the second buildup layer 32 is formed on the core back surface 13 (the lower surface in FIG. 1) of the core substrate 11.
- the core substrate 11 is made of, for example, a resin insulating material (glass epoxy material) obtained by impregnating a glass cloth as a reinforcing material with an epoxy resin.
- a resin insulating material glass epoxy material obtained by impregnating a glass cloth as a reinforcing material with an epoxy resin.
- Through holes 15 (through holes) penetrating in the thickness direction are formed at a plurality of locations in the core substrate 11, and through holes conductors 16 are formed in the through holes 15.
- the through hole conductor 16 connects the core main surface 12 side of the core substrate 11 and the core back surface 13 side.
- the inside of the through hole conductor 16 is filled with a closing body 17 such as an epoxy resin, for example.
- conductor layers 41 made of copper are pattern-formed on the core main surface 12 and the core back surface 13 of the core substrate 11, and the conductor layers 41 are electrically connected to the through hole conductors 16.
- the first buildup layer 31 formed on the core main surface 12 of the core substrate 11 has a buildup structure in which a plurality of resin insulating layers 33, 35, 37 and a plurality of conductor layers 42 made of copper are alternately stacked. have.
- the resin insulating layer 33 on the inner layer side disposed on the core main surface 12 side is formed thicker than the other resin insulating layers 35 and 37 on the upper layer side.
- the resin insulating layer 33 on the inner layer side is configured by including the glass cloth 51 as an inorganic fiber cloth in the inner layer portion of the resin insulating material 50 made of epoxy resin.
- the thickness of the resin insulating layer 33 is about 100 ⁇ m, and the thickness of the glass cloth 51 is about 50 ⁇ m.
- the resin insulating layers 35 and 37 on the upper layer side are resin insulating layers made of epoxy resin and do not contain the glass cloth 51.
- the thickness of the resin insulating layers 35 and 37 is about 50 ⁇ m.
- Terminal pads 45 are formed in an array at a plurality of locations on the resin insulating layer 37. Further, the upper surface of the resin insulating layer 37 is almost entirely covered by the solder resist 39. An opening 46 for exposing the terminal pad 45 is formed at a predetermined position of the solder resist 39. The terminal pad 45 exposed from the opening 46 is electrically connected to the connection terminal of the semiconductor chip through a solder bump (not shown). Further, in the resin insulating layer 33 on the inner layer side, the via holes 53 and the conformal via conductors 54 are formed. Furthermore, in the resin insulating layers 35 and 37 on the outer layer side, the via holes 55 and the filled via conductors 56 are formed. The via conductors 54 and 56 electrically connect the conductor layers 41 and 42 and the terminal pad 45 to each other.
- the second buildup layer 32 formed on the core back surface 13 of the core substrate 11 has substantially the same structure as the first buildup layer 31 described above. That is, the second buildup layer 32 has a buildup structure in which a plurality of resin insulating layers 34, 36 and 38 and a plurality of conductor layers 42 are alternately stacked.
- the resin insulating layer 34 on the inner layer side disposed on the core back surface 13 side is formed thicker than the other resin insulating layers 36 and 38 on the upper layer side.
- the resin insulation layer 34 on the inner layer side is configured to include the glass cloth 51 in the inner layer portion of the resin insulation material 50 made of epoxy resin.
- the thickness of the resin insulating layer 34 is about 100 ⁇ m, and the thickness of the glass cloth 51 is about 50 ⁇ m.
- the resin insulating layers 36 and 38 on the upper layer side are resin insulating layers made of epoxy resin and do not contain the glass cloth 51. The thickness of these resin insulating layers 36 and 38 is about 50 ⁇ m.
- BGA pads 48 are formed in an array at a plurality of locations on the lower surface of the resin insulation layer 38.
- the lower surface of the resin insulation layer 38 is almost entirely covered by the solder resist 40.
- An opening 49 for exposing the BGA pad 48 is formed at a predetermined position of the solder resist 40.
- the BGA pads 48 exposed from the openings 49 are electrically connected to the mother board (external substrate) through solder bumps (not shown).
- via holes 53 and conformal via conductors 54 are formed in the resin insulation layer 34 on the inner layer side.
- the via holes 55 and the filled via conductors 56 are formed.
- the via conductors 54 and 56 electrically connect the conductor layers 41 and 42 and the BGA pad 48 to each other.
- the via holes 53 formed in the resin insulating layer 33 are through holes provided so as to gradually expand in diameter from the inner layer side to the outer layer side.
- a conformal via conductor 54 electrically connecting the conductor layers 41 and 42 is provided along the shape of the via hole 53.
- a glass cloth 51 is provided substantially at the center in the thickness direction. Then, the end 51 A of the glass fiber constituting the glass cloth 51 protrudes from the inner wall surface of the via hole 53 and bites into the side portion of the conformal via conductor 54.
- the glass cloth 51 is provided substantially at the central portion in the thickness direction, but the glass cloth 51 may be provided at a portion on the upper layer side of the central portion.
- the via hole 53 has a minimum opening diameter defined by the projection 59 of the glass cloth 51.
- the conformal via conductor 54 is formed along the projecting portion 59 of the glass cloth 51 so as to cover the surface thereof. For this reason, in the conformal via conductor 54, the inner side surface at a position corresponding to the protrusion 59 of the glass cloth 51 has a shape in which the via hole 53 bulges inward in the radial direction.
- the anchor portion 58 is formed by filling a part of the resin insulation layer 35 stacked on the upper layer side inside the conformal via conductor 54.
- the anchor portion 58 is narrowed narrowly at a position corresponding to the protrusion 59 of the glass cloth 51, and the lower end side bulges outward in the radial direction of the via hole 53 than the upper end side.
- the lower end side of the anchor portion 58 is twice as large as the thin and narrow portion. Further, since the projecting portion 59 of the glass cloth 51 is at the substantially central portion in the thickness direction of the resin insulating layer 33, the anchor portion 58 is narrowed at the substantially central portion.
- the projection 59 of the glass cloth 51 is displaced to the upper side.
- the narrow and narrow portion of the anchor portion 58 is formed on the upper layer side, so that the size on the lower end side is increased.
- the conformal via conductor 54 is formed such that the thickness of the lower portion 54A in contact with the lower end side of the anchor portion 58 is thinner than the upper portion 54B. That is, the conformal via conductor 54 is formed thinner on the lower layer side than the protrusion 59 of the glass cloth 51 and formed thicker on the upper layer side. As a result, the space of the lower portion is expanded inside the conformal via conductor 54, and the lower end side of the anchor portion 58 is formed in that portion.
- a copper-clad laminate in which copper foils are attached to both sides of a substrate made of glass epoxy is prepared. Then, drilling is performed using a drill machine, and the through holes 15 penetrating the front and back surfaces of the copper clad laminate are formed in advance at predetermined positions. Then, the through-hole conductor 16 is formed in the through hole 15 by performing electroless copper plating and electrolytic copper plating on the inner surface of the through hole 15 of the copper clad laminate.
- the hollow portion of the through hole conductor 16 is filled with an insulating resin material (epoxy resin) to form a closed body 17. Furthermore, the copper foil of the copper-clad laminate and the copper plating layer formed on the copper foil are patterned by, for example, a subtractive method. As a result, as shown in FIG. 3, the core substrate 11 on which the through hole conductor 16 and the conductor layer 41 are formed is obtained.
- an insulating resin material epoxy resin
- the first buildup layer 31 is formed on the core main surface 12 of the core substrate 11 by performing the buildup process, and the second buildup layer 32 is also formed on the core back surface 13 of the core substrate 11. Form.
- the resin insulation material 50 includes the glass cloth 51 on the core main surface 12 and the core back surface 13 on which the conductor layers 41 are formed in the core substrate 11.
- the sheet-like resin insulating layers 33 and 34 are disposed, and the resin insulating layers 33 and 34 are attached.
- laser drilling is performed using, for example, a carbon dioxide gas laser (CO 2 laser) to form via holes 53 at predetermined positions of the resin insulating layers 33 and 34.
- CO 2 laser carbon dioxide gas laser
- the glass cloth 51 in the resin insulating layers 33 and 34 is also cut off by being burned out by laser processing.
- the energy absorption rate of the carbon dioxide gas laser is higher in the resin insulating material 50 than in the glass cloth 51, a part of the glass cloth 51 remains in the state of being ejected from the inner wall surface of the via hole 53.
- a desmear process is performed to remove the smear in each via hole 53.
- the epoxy resin on the inner wall surface in the via hole 53 is selectively removed and retracted in the radial direction.
- the end 51 A of the glass fiber constituting the glass cloth 51 is made to project from the inner wall surface of the via hole 53 to form a projection 59.
- the opening diameter defined by the projecting portion 59 of the glass cloth 51 is the minimum diameter in the via hole 53.
- plating is performed to form conformal via conductors 54 in each via hole 53. More specifically, by applying electroless copper plating, the surface of each via hole 53 and the surface of the glass cloth 51 have a predetermined thickness (specifically, for example, a thickness of about 0.1 ⁇ m to 1 ⁇ m). Form a plating layer. Thereafter, a conformal via conductor 54 is formed in the via hole 53 by applying electrolytic copper plating. Furthermore, the conductor layer 42 is pattern-formed on the resin insulating layers 33 and 34 by etching according to a conventionally known method (for example, a semi-additive method) (see FIG. 6).
- a conventionally known method for example, a semi-additive method
- the sheet-like resin insulating layers 35 and 36 not including the glass cloth 51 are disposed, and the resin insulating layers 35 and 36 are formed.
- the anchor portion 58 is formed by filling a part of the resin insulating layers 35 and 36 inside the conformal via conductor 54.
- laser drilling is performed using, for example, a carbon dioxide gas laser to form via holes 55 at predetermined positions of the resin insulating layers 35 and 36.
- the resin insulating layers 35 and 36 are thinner than the resin insulating layers 33 and 34 and do not contain the glass cloth 51. Therefore, at the time of forming the via hole 55, the output of the carbon dioxide gas laser is weakened to perform laser hole processing as compared with the formation of the via hole 53 described above.
- a filled via conductor 56 is formed in each via hole 55 by performing electroless copper plating and electrolytic copper plating according to a conventionally known method. Furthermore, the conductor layer 42 is pattern-formed on the resin insulating layers 35 and 36 by performing etching using a conventionally known method (for example, a semi-additive method).
- the other resin insulating layers 37 and 38 and the conductor layer 42 are also formed by the same method as the resin insulating layers 35 and 36 and the conductor layer 42 described above, and stacked on the resin insulating layers 35 and 36 (see FIG. 8). .
- a plurality of terminal pads 45 are formed on the resin insulation layer 37
- a plurality of BGA pads 48 are formed on the resin insulation layer 38.
- a photosensitive epoxy resin is applied on the resin insulating layers 37 and 38 and cured to form solder resists 39 and 40. Thereafter, exposure and development are performed in a state where a predetermined mask is disposed, and the openings 46 and 49 are patterned in the solder resists 39 and 40. Through the above steps, the multilayer wiring board 10 shown in FIG. 1 is manufactured.
- the inventor cut the multilayer wiring board 10 manufactured by the above method in the thickness direction on the axis of the conformal via conductor 54, and observed the cut surface of the via conductor 54 with an optical microscope.
- FIG. 9 shows an optical micrograph 60 of a cut surface of the conformal via conductor 54.
- the glass cloth 51 protrudes and cuts into the side of the conformal via conductor 54. Further, it was confirmed that the anchor portion 58 was formed without a gap inside the conformal via conductor 54, and the adhesion between the via conductor 54 and the anchor portion 58 was sufficiently secured. Furthermore, the anchor portion 58 is narrowly narrowed at a position corresponding to the protruding portion of the glass cloth 51, and the lower end side has a thickness twice or more than that of the portion where the lower end side is narrowed.
- the anchor portion 58 is formed inside the conformal via conductor 54 by filling a part of the resin insulating layers 35 and 36 on the upper layer side.
- the lower end side of the contact hole bulges outward in the radial direction of the via hole 53.
- anchor portion 58 is securely fixed to the inside of conformal via conductor 54, and peeling of resin insulating layers 35 and 36 on the top of conformal via conductor 54 can be reliably prevented.
- the tip 51A of the glass fiber constituting the glass cloth 51 projects from the inner wall surface of the via hole 53 provided in the resin insulating layers 33 and 34.
- the anchor portion 58 is narrowed at a position corresponding to the projection 59 of the glass cloth 51.
- the conformal via conductor 54 is securely fixed by the projecting portion 59 of the glass cloth 51, it is possible to prevent the via omission such as the via conductor 54 coming out of the via hole 53.
- the anchor portion 58 is latched to the conformal via conductor 54 by the thin and narrow shape, peeling of the resin insulating layers 35 and 36 can be reliably prevented.
- the tip 51A of the glass cloth 51 project from the inner wall surface of the via hole 53, the strength of the portion in contact with the anchor portion 58 is increased, and the anchor portion 58 can be fixed more reliably.
- the conformal via conductor 54 is formed such that the thickness of the lower portion 54A located on the lower end side of the anchor portion 58 is thinner than the upper portion 54B. Further, the conformal via conductor 54 is expanded at a substantially central portion in the penetrating direction of the via hole 53. In this way, the space of the lower portion can be widely secured inside the conformal via conductor 54, and the anchor portion 58 in which the lower end side bulges can be reliably formed. Further, in the present embodiment, the lower end side of the anchor portion 58 bulges so as to be twice or more the thickness of the narrow and narrow portion, so the anchor portion 58 is reliably fixed to the inside of the via conductor 54 be able to.
- the conformal via conductor 54 is formed in the resin insulating layers 33 and 34 on the inner layer side to be the core substrate 11 side, and the filled via conductor 56 is formed on the resin insulating layers 35 to 38 on the upper layer side.
- the conformal via conductor 54 may be formed on all resin insulating layers 33 to 38 constituting the multilayer wiring board 10.
- only a part of the resin insulation layers 33 and 34 on the inner layer side is formed of the insulation layer including the glass cloth 51, and the other resin insulation layers 35 to 38 are the glass cloth 51.
- the multilayer wiring board 10 may be configured only with the resin insulation layer including the glass cloth 51.
- the conformal via conductor 54 is formed in the resin insulation layers 33 and 34 including the glass cloth 51, and a part of the upper layer resin insulation layers 35 and 36 is formed inside the conformal via conductor 54.
- the conformal conductor 61 as shown in FIG. 10 may be formed by adjusting plating conditions for the via holes 55 formed in the resin insulation layer 35 not including the glass cloth 51.
- the conformal conductor 61 of FIG. 10 is formed thicker on the upper layer side than on the lower layer side. At the inner side of the conformal conductor 61, the space at the lower side is expanded, and a part of the upper resin insulating layer 37 is filled in the space to form an anchor portion 62.
- the lower end side bulges outward in the radial direction of the via hole 53 than the upper end side. Even when the multilayer wiring board is configured as described above, the adhesion strength between the conformal conductor 61 and the resin insulating layer 37 can be sufficiently secured.
- the conformal via conductor 54 is formed thicker on the upper layer side than on the lower layer side, but is formed with a substantially uniform thickness by adjusting the plating conditions May be.
- the conformal conductor is embodied as the conformal via conductor 54.
- a conductor for example, a through hole conductor formed to penetrate a plurality of resin insulating layers may be embodied as a conformal conductor.
- the multilayer wiring board 10 having the core substrate 11 is embodied, but the present invention may be embodied on a coreless wiring board not having the core substrate 11.
- the form of the multilayer wiring board 10 in the above embodiment is not limited to only BGA (ball grid array), and the present invention is applied to wiring boards such as PGA (pin grid array) and LGA (land grid array), for example. May be
- a multilayer wiring board according to the first aspect, wherein the lower end side of the anchor portion is expanded so as to have a thickness twice or more that of the narrow and narrow portion.
- the plurality of resin insulating layers and the plurality of conductor layers constitute a buildup layer, the through hole is a via hole, and the conformal conductor is a conformal via conductor.
- Multilayer wiring board characterized by;
- Resin insulating layer 42 ... conductor layer 50 ... Resin insulation material 51 ... Glass cloth as inorganic fiber cloth 51A ... tip of glass cloth 53, 55 ... Via hole as through hole 54, 61 ... Conformal via conductor as a conformal conductor 54A ... lower part 54B ... upper part 58, 62 ... anchor part 59 ... projection
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Abstract
Description
内層側の樹脂絶縁層34は、エポキシ樹脂からなる樹脂絶縁材料50の内層部にガラスクロス51を含んで構成されている。
樹脂絶縁層34の厚さは100μm程度であり、ガラスクロス51の厚さは50μm程度である。一方、上層側の樹脂絶縁層36,38は、エポキシ樹脂からなる樹脂絶縁層であり、ガラスクロス51を含んでいない。これら樹脂絶縁層36,38の厚さは50μm程度である。
・上記実施の形態における多層配線基板10の形態は、BGA(ボールグリッドアレイ)のみに限定されず、例えばPGA(ピングリッドアレイ)やLGA(ランドグリッドアレイ)等の配線基板に本発明を適用させてもよい。
(1)手段1において、前記アンカー部の下端側は、細く括れた部分よりも2倍以上の太さとなるように膨らんでいることを特徴とする多層配線基板。
33~38…樹脂絶縁層
42…導体層
50…樹脂絶縁材料
51…無機繊維布としてのガラスクロス
51A…ガラスクロスの先端
53,55…貫通穴としてのビア穴
54,61…コンフォーマル型導体としてのコンフォーマルビア導体
54A…下側部分
54B…上側部分
58,62…アンカー部
59…突出部
Claims (4)
- 複数の樹脂絶縁層及び複数の導体層を交互に積層して多層化した構造を有し、前記樹脂絶縁層のうちの少なくとも1層には複数の貫通穴が形成され、前記複数の貫通穴内には前記導体層間を電気的に接続するコンフォーマル型導体がそれぞれ形成されている多層配線基板であって、
前記コンフォーマル型導体の内側に、上層側に積層される前記樹脂絶縁層の一部を充填することで形成されたアンカー部を備え、
前記アンカー部の下端側が上端側よりも前記貫通穴の径方向外側に膨らんでいることを特徴とする多層配線基板。 - 前記樹脂絶縁層のうちの少なくとも1層は、樹脂絶縁材料の内層部に無機繊維布を含むとともに、当該樹脂絶縁層に設けられた前記貫通穴の内壁面には前記無機繊維布を構成する無機繊維の先端が突出した突出部が形成され、前記アンカー部は前記突出部に対応した位置で細く括れていることを特徴とする請求項1に記載の多層配線基板。
- 前記貫通孔は、前記突出部で画定される開口径が最小径であることを特徴とする請求項1または2に記載の多層配線基板。
- 前記コンフォーマル型導体は、前記アンカー部の下端側に接する下側部分の厚さが上側部分よりも薄く形成されていることを特徴とする請求項1乃至3のいずれか1項に記載の多層配線基板。
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CN201380003001.5A CN103797902A (zh) | 2012-04-26 | 2013-03-20 | 多层布线基板 |
US14/240,153 US9066419B2 (en) | 2012-04-26 | 2013-03-20 | Multilayer wiring substrate |
KR1020147011034A KR101579019B1 (ko) | 2012-04-26 | 2013-03-20 | 다층배선기판 |
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JP2012101907A JP5865771B2 (ja) | 2012-04-26 | 2012-04-26 | 多層配線基板 |
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US (1) | US9066419B2 (ja) |
JP (1) | JP5865771B2 (ja) |
KR (1) | KR101579019B1 (ja) |
CN (1) | CN103797902A (ja) |
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WO (1) | WO2013161181A1 (ja) |
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CN105247972A (zh) * | 2013-04-26 | 2016-01-13 | 株式会社电装 | 多层基板、使用多层基板的电子装置、多层基板的制造方法、基板以及使用基板的电子装置 |
JP2015159240A (ja) * | 2014-02-25 | 2015-09-03 | 矢崎総業株式会社 | フレキシブルフラット回路体 |
KR20190012485A (ko) * | 2017-07-27 | 2019-02-11 | 삼성전기주식회사 | 인쇄회로기판 및 그 제조 방법 |
US10347507B2 (en) * | 2017-09-29 | 2019-07-09 | Lg Innotek Co., Ltd. | Printed circuit board |
KR102531762B1 (ko) | 2017-09-29 | 2023-05-12 | 엘지이노텍 주식회사 | 인쇄회로기판 및 이의 제조 방법 |
US11540390B2 (en) * | 2018-07-31 | 2022-12-27 | Kyocera Corporation | Printed wiring board and method of manufacturing printed wiring board |
JP7159059B2 (ja) * | 2019-01-09 | 2022-10-24 | 新光電気工業株式会社 | 積層基板及び積層基板製造方法 |
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JP2001257470A (ja) * | 2000-03-10 | 2001-09-21 | Nec Corp | ビルドアップ多層プリント配線板とその製造方法 |
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JPH1027968A (ja) * | 1996-07-09 | 1998-01-27 | Kyocera Corp | 多層配線基板 |
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JP2006093438A (ja) * | 2004-09-24 | 2006-04-06 | Denso Corp | プリント基板及びその製造方法 |
JP4267660B2 (ja) | 2006-12-05 | 2009-05-27 | 日本特殊陶業株式会社 | 多層配線基板及び素子搭載装置 |
JP5284147B2 (ja) * | 2008-03-13 | 2013-09-11 | 日本特殊陶業株式会社 | 多層配線基板 |
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2012
- 2012-04-26 JP JP2012101907A patent/JP5865771B2/ja not_active Expired - Fee Related
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2013
- 2013-03-20 WO PCT/JP2013/001885 patent/WO2013161181A1/ja active Application Filing
- 2013-03-20 US US14/240,153 patent/US9066419B2/en not_active Expired - Fee Related
- 2013-03-20 KR KR1020147011034A patent/KR101579019B1/ko not_active IP Right Cessation
- 2013-03-20 CN CN201380003001.5A patent/CN103797902A/zh active Pending
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JP2001257470A (ja) * | 2000-03-10 | 2001-09-21 | Nec Corp | ビルドアップ多層プリント配線板とその製造方法 |
JP2005183548A (ja) * | 2003-12-17 | 2005-07-07 | Fujikura Ltd | 基板及びその製造方法 |
JP2007227512A (ja) * | 2006-02-22 | 2007-09-06 | Ibiden Co Ltd | プリント配線板およびその製造方法 |
WO2010076875A1 (ja) * | 2008-12-29 | 2010-07-08 | イビデン株式会社 | プリント配線板及びその製造方法 |
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US9066419B2 (en) | 2015-06-23 |
KR101579019B1 (ko) | 2015-12-18 |
CN103797902A (zh) | 2014-05-14 |
TW201401964A (zh) | 2014-01-01 |
US20140216796A1 (en) | 2014-08-07 |
JP2013229525A (ja) | 2013-11-07 |
KR20140065474A (ko) | 2014-05-29 |
JP5865771B2 (ja) | 2016-02-17 |
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