WO2017056998A1 - 樹脂基板構造体およびその製造方法 - Google Patents

樹脂基板構造体およびその製造方法 Download PDF

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Publication number
WO2017056998A1
WO2017056998A1 PCT/JP2016/077126 JP2016077126W WO2017056998A1 WO 2017056998 A1 WO2017056998 A1 WO 2017056998A1 JP 2016077126 W JP2016077126 W JP 2016077126W WO 2017056998 A1 WO2017056998 A1 WO 2017056998A1
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WO
WIPO (PCT)
Prior art keywords
metal film
substrate structure
thermoplastic resin
joint
coating portion
Prior art date
Application number
PCT/JP2016/077126
Other languages
English (en)
French (fr)
Inventor
喜人 大坪
南 匡晃
Original Assignee
株式会社村田製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Priority to CN201690001161.5U priority Critical patent/CN208227478U/zh
Priority to JP2017543110A priority patent/JP6265310B2/ja
Publication of WO2017056998A1 publication Critical patent/WO2017056998A1/ja
Priority to US15/907,366 priority patent/US10455701B2/en

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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00Printed circuits
    • H05K1/02Details
    • H05K1/14Structural association of two or more printed circuits
    • H05K1/142Arrangements of planar printed circuit boards in the same plane, e.g. auxiliary printed circuit insert mounted in a main printed circuit
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/10Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B29C65/081Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations having a component of vibration not perpendicular to the welding surface
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    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/72321General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of metals or their alloys
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    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00General aspects of processes or apparatus for joining preformed parts
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    • B29C66/73General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/731General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the intensive physical properties of the material of the parts to be joined
    • B29C66/7316Surface properties
    • B29C66/73161Roughness or rugosity
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    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/739General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
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    • B29C66/742Joining plastics material to non-plastics material to metals or their alloys
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    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/80General aspects of machine operations or constructions and parts thereof
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    • B29C66/814General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
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    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/832Reciprocating joining or pressing tools
    • B29C66/8322Joining or pressing tools reciprocating along one axis
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    • HELECTRICITY
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    • HELECTRICITY
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    • HELECTRICITY
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    • B29L2031/3425Printed circuits
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00Layers arrangement
    • B32B2250/44Number of layers variable across the laminate
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/70Other properties
    • B32B2307/746Slipping, anti-blocking, low friction
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00Electrical equipment
    • B32B2457/08PCBs, i.e. printed circuit boards
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00Printed circuits
    • H05K1/02Details
    • H05K1/03Use of materials for the substrate
    • H05K1/0313Organic insulating material
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00Printed circuits
    • H05K1/02Details
    • H05K1/11Printed elements for providing electric connections to or between printed circuits
    • H05K1/117Pads along the edge of rigid circuit boards, e.g. for pluggable connectors
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00Printed circuits
    • H05K1/02Details
    • H05K1/14Structural association of two or more printed circuits
    • H05K1/147Structural association of two or more printed circuits at least one of the printed circuits being bent or folded, e.g. by using a flexible printed circuit
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/01Dielectrics
    • H05K2201/0104Properties and characteristics in general
    • H05K2201/0129Thermoplastic polymer, e.g. auto-adhesive layer; Shaping of thermoplastic polymer
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/01Dielectrics
    • H05K2201/0183Dielectric layers
    • H05K2201/0195Dielectric or adhesive layers comprising a plurality of layers, e.g. in a multilayer structure
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/03Conductive materials
    • H05K2201/0332Structure of the conductor
    • H05K2201/0335Layered conductors or foils
    • H05K2201/0338Layered conductor, e.g. layered metal substrate, layered finish layer, layered thin film adhesion layer
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09Shape and layout
    • H05K2201/09009Substrate related
    • H05K2201/09036Recesses or grooves in insulating substrate
    • 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
    • H05K2203/02Details related to mechanical or acoustic processing, e.g. drilling, punching, cutting, using ultrasound
    • H05K2203/0278Flat pressure, e.g. for connecting terminals with anisotropic conductive adhesive
    • 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
    • H05K2203/02Details related to mechanical or acoustic processing, e.g. drilling, punching, cutting, using ultrasound
    • H05K2203/0285Using ultrasound, e.g. for cleaning, soldering or wet treatment
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/19Sheets or webs edge spliced or joined

Definitions

  • the present invention relates to a resin substrate structure and a manufacturing method thereof.
  • Patent Document 1 As a method for joining wiring boards, a technique of applying ultrasonic vibration to fuse metals together is described in Japanese Patent Laid-Open No. 2001-7511 (Patent Document 1).
  • a conductor pattern formed by etching a copper foil on the surface of a PET film and a conductor pattern formed by etching an aluminum foil on the surface of the PET film are formed.
  • the copper foil conductor pattern and the aluminum foil conductor pattern are superposed so that they contact each other, and are sandwiched between an ultrasonic horn and an anvil to give ultrasonic vibrations.
  • a plurality of protrusions are provided on at least one end face of an ultrasonic horn and an anvil, and a resin base through a hole generated by metal plastic flow They are fused together by ultrasonic vibration.
  • Patent Document 2 describes the use of an ultrasonic horn having a corrugated tip at the time of bonding by ultrasonic bonding of the terminal portion of the flexible wiring board.
  • the method described as the first embodiment in Patent Document 1 improves the flexibility of the thermoplastic resin. There is a risk that the resulting ultrasonic vibration slips. When slippage of ultrasonic vibration occurs, there is a possibility that ultrasonic vibration is not applied as intended and there is a problem in bonding, or a relative displacement between wiring boards may occur.
  • an object of the present invention is to provide a resin substrate structure and a method for manufacturing the same that can perform ultrasonic bonding while suppressing slippage of ultrasonic vibration and occurrence of bonding failure and position shift due thereto. .
  • a resin substrate structure includes a first member having a first metal film and including a thermoplastic resin layer of one layer or a laminate of two or more thermoplastic resin layers; A second member having a second metal film, wherein at least a part of the first metal film and at least a part of the second metal film are joined in a state of overlapping each other, At the interface where the second metal film is joined, the first metal film and the second metal film are in a metallurgical bond state, and the first member includes the first metal film and the first metal film.
  • the first joint resin coating portion is a portion where the thermoplastic resin layer overlaps the portion where the two metal films overlap, and the surface of the first joint resin coating portion is to suppress slippage of ultrasonic vibration. The unevenness is provided.
  • the unevenness for suppressing the slip of the ultrasonic vibration is provided on the surface of the first joint portion resin coating portion, the slip of the ultrasonic vibration and the occurrence of the joining failure and the displacement due to the slip.
  • Ultrasonic bonding can be performed while suppressing, and a resin substrate structure with good bonding can be obtained.
  • FIG. 1 A cross-sectional view of the resin substrate structure 101 in this embodiment is shown in FIG.
  • the resin substrate structure 101 includes the first metal film 13, the first member 51 including the one-layer thermoplastic resin layer 2 or the laminate 1 of the two or more thermoplastic resin layers 2, and the second metal film. And a second member 52 having 14. At least a part of the first metal film 13 and at least a part of the second metal film 14 are joined so as to overlap each other. At the interface where the first metal film 13 and the second metal film 14 are joined, the first metal film 13 and the second metal film 14 are in a metallurgical bond state.
  • the first member 51 includes a first joint resin coating portion 15 that is a portion where the thermoplastic resin layer 2 overlaps a portion where the first metal film 13 and the second metal film 14 overlap. Concavities and convexities 15 a are provided on the surface of the first joint resin coating portion 15 to suppress slippage of ultrasonic vibration.
  • the metallurgical bond between the first metal film 13 and the second metal film 14 is obtained by ultrasonically bonding the first metal film 13 and the second metal film 14 that were originally separate. is there. During ultrasonic bonding, the oxide film and dirt originally present at the interface to be bonded are removed by ultrasonic vibration, and the metal crystal grains approach each other until the interatomic distance is reached. A strong attractive force acts between the first metal film 13 and the second metal film 14, and a metallurgical bond is generated.
  • the resin substrate structure 101 includes a metallurgically bonded portion obtained as described above.
  • the resin substrate structure 101 can be obtained by combining and joining the first member 51 and the second member 52 originally prepared as separate members. As shown in FIG. 2, the first joint resin coating portion 15 of the first member 51 and the second joint resin coating portion 16 of the second member 52 are overlapped. As shown in FIG. 3, the first joint resin coating portion 15 and the second joint resin coating portion 16 are stacked on the upper surface of the anvil 62, and in the direction of the arrow 91 with the ultrasonic horn 61 from above. Pressurize. The ultrasonic horn 61 and the anvil 62 are each a part of the ultrasonic bonding apparatus.
  • the lower surface of the ultrasonic horn 61 and the upper surface of the anvil 62 are shown as flat, but minute concavities and convexities for increasing the frictional force may be formed on these surfaces.
  • the ultrasonic horn 61 is caused to vibrate ultrasonically via the ultrasonic horn 61 as indicated by an arrow 92.
  • metallurgical bonding as a result of ultrasonic bonding is established as shown in an enlarged view in FIG.
  • the surrounding thermoplastic resin layers 2 are also welded to each other because the interface generates heat by ultrasonic vibration.
  • the broken line shown in FIG. 4 schematically shows the position of the interface.
  • first member 51 and the second member 52 are not limited thereto.
  • the unevenness 15a for suppressing the slip of the ultrasonic vibration is provided on the surface of the first joint resin coating portion 15, the slip of the ultrasonic vibration in the first member 51 is suppressed.
  • ultrasonic bonding can be performed while suppressing bonding failure and positional deviation, and the resin substrate structure 101 with good bonding can be obtained.
  • coated part 15 is thin compared with parts other than the 1st junction part resin coating
  • the interlayer connection conductors extend in the same way from above and below these conductor films at the joints between the first metal film 13 and the second metal film 14. However, it is not limited to such an arrangement.
  • the first interlayer connection conductor 17 is connected to the first metal film 13 from the inside of the first member 51, and the second metal film 14 is perpendicular to the second metal film 14.
  • the second interlayer connection conductor 18 is connected from the inside of the second member 52 at a position different from the first interlayer connection conductor 17 when viewed from the right direction.
  • the interlayer connection conductor is disposed at a different position between the first metal film 13 and the second metal film 14 to be bonded to each other, no countermeasure should be taken.
  • the slip of the ultrasonic vibration is likely to occur.
  • the unevenness 15a for suppressing the slip of the ultrasonic vibration is provided on the surface of the first joint resin coating portion 15, the ultrasonic vibration is provided. Therefore, it is possible to suppress the occurrence of a bonding failure or misalignment caused by the slippage of the sheet, and greatly enjoy the benefits.
  • thermoplastic resin is used.
  • the layers are also preferably in contact with each other and fused together (see FIG. 4). That is, the second member 52 includes one thermoplastic resin layer 2 or a laminate of two or more thermoplastic resin layers 2, and the first member 51 and the second member 52 include the thermoplastic resin layers 2. It is preferable that they are welded to each other at the part where they contact.
  • the thermoplastic resin layers are also bonded to each other, whereby a strong and stable structure can be obtained.
  • thermoplastic resin layers are also bonded in this way can be realized by adjusting the condition of ultrasonic vibration during ultrasonic bonding.
  • the size when the surface where the ultrasonic horn contacts the object to be welded is viewed from below and the size when the surface where the anvil contacts the object to be bonded is viewed from above, both from the size of the metal film. In this way, it is possible to easily obtain a configuration in which the thermoplastic resin layers are bonded together in addition to the metal films.
  • the second member 52 is a laminate of one thermoplastic resin layer 2 or two or more thermoplastic resin layers 2.
  • the second member 52 may be a member that is not a resin multilayer substrate.
  • the second member 52 may be a member that does not include a thermoplastic resin layer. That is, it is sufficient if only the first member 51 is a member including a thermoplastic resin layer.
  • the second member 52 includes one thermoplastic resin layer 2 or a laminate of two or more thermoplastic resin layers 2, and the first member 51 and the second member 52 are in contact with each other.
  • the second member 52 includes a second joint resin coating portion 16 that is a portion where the thermoplastic resin layer 2 overlaps a portion where the first metal film 13 and the second metal film 14 overlap, It is preferable that the surface of the joint resin coating portion 16 is provided with unevenness 16a for suppressing slippage of ultrasonic vibration.
  • FIGS. 1 and 5 already has this configuration.
  • the surface of the second joint resin coating portion 16 is provided with the unevenness 16a, it is difficult to slip not only from the first joint resin coating portion 15 side but also from the second joint resin coating portion 16 side. Since the ultrasonic vibration can be applied while being held in a state, it is possible to more reliably suppress the slip of the ultrasonic vibration, and as a result, it is possible to perform a good ultrasonic bonding while suppressing the occurrence of bonding failure and displacement. can do.
  • FIG. 6 shows an example when the first joint resin coating portion 15 is viewed from above.
  • the lower part of the unevenness 15 a is indicated by hatching.
  • the white parts that are not hatched are higher than the hatched parts.
  • the unevenness 15a is formed as a striped pattern by repeating a linear groove extending in a direction perpendicular to the longitudinal direction (left-right direction in FIG. 6) of the first joint resin coating portion 15. ing.
  • the direction of the stripe pattern is merely an example, and is not limited to this.
  • the unevenness 15a is formed as a striped pattern by repeating linear grooves extending in a direction parallel to the longitudinal direction (left-right direction in FIG. 7) of the first joint resin coating portion 15. May be.
  • the unevenness 15a is not limited to a striped pattern.
  • the unevenness 15a may be formed as a checkered pattern, for example, as shown in FIG. Also in FIG. 8, the lower part of the unevenness 15a is indicated with hatching.
  • the matters described with reference to FIGS. 6 to 8 are the same for the unevenness 16a provided in the second joint resin coating portion 16.
  • the irregularities 15a and 16a are not limited to a striped pattern or a checkered pattern, but may be any other pattern, or may be a random pattern.
  • Embodiment 3 With reference to FIG. 9, the resin substrate structure in Embodiment 3 based on this invention is demonstrated. A cross-sectional view of the resin substrate structure 103 in this embodiment is shown in FIG.
  • the resin substrate structure 103 includes the first metal film 13, the first member 51 including the one-layer thermoplastic resin layer 2 or the laminate 1 of the two or more thermoplastic resin layers 2, and the second metal film. And a second member 52 having 14.
  • the second member 52 is the mother substrate 30.
  • the mother substrate 30 may not include a laminate of thermoplastic resin layers.
  • Mother board 30 may be, for example, a printed wiring board.
  • At least a part of the first metal film 13 and at least a part of the second metal film 14 are joined so as to overlap each other.
  • the first metal film 13 and the second metal film 14 are in a metallurgical bond state.
  • the second metal film 14 is a pad electrode 31 provided on the surface of the mother substrate 30.
  • the first member 51 includes a first joint resin coating portion 15 that is a portion where the thermoplastic resin layer 2 overlaps a portion where the first metal film 13 and the second metal film 14 overlap. Concavities and convexities 15 a are provided on the surface of the first joint resin coating portion 15 to suppress slippage of ultrasonic vibration.
  • ultrasonic bonding can be performed while suppressing the occurrence of slippage of ultrasonic vibration and the occurrence of bonding failure and displacement due to this, and the resin has been bonded satisfactorily.
  • the substrate structure 103 can be obtained.
  • the slip of the ultrasonic vibration is suppressed on the surface of the first joint resin coating portion 15.
  • the effect of the present invention can be enjoyed by providing the unevenness 15a.
  • Embodiment 4 With reference to FIG. 10, the resin substrate structure in Embodiment 4 based on this invention is demonstrated. A cross-sectional view of the resin substrate structure 104 in this embodiment is shown in FIG.
  • the resin substrate structure 104 is similar to the resin substrate structure 101 shown in the first embodiment, but differs in the following points.
  • the first protective film 23 is provided so as to cover the surface of the first joint resin coating portion 15, and the slip of ultrasonic vibration is suppressed on the surface of the first protective film 23. Concavities and convexities 23a are provided for this purpose.
  • the first protective film 23 may be a resist film, for example.
  • the first protective film 23 may be a resin film such as a coverlay film.
  • the first joint resin coating portion 15 can be protected. Since the unevenness 23a is provided on the surface of the first protective film 23, even if ultrasonic bonding is performed in a state after the first protective film 23 is provided so as to cover the first joint resin coating portion 15, the unevenness It is possible to perform ultrasonic bonding while suppressing the occurrence of slippage of ultrasonic vibration and the occurrence of bonding failure and displacement due to this. As a result, the resin substrate structure 104 can be satisfactorily bonded.
  • first bonding portion resin coating portion 15 is thinner than other portions, it is possible to increase the effect of reinforcement by providing such a protective film, so that the reliability can be increased.
  • Embodiment 5 With reference to FIG. 11, the resin substrate structure in Embodiment 5 based on this invention is demonstrated. A cross-sectional view of the resin substrate structure 105 in the present embodiment is shown in FIG.
  • the resin substrate structure 105 is similar to the resin substrate structure 104 shown in the fourth embodiment, but is different in the following points.
  • a first protective film 23 is provided so as to cover the surface of the first joint resin coating portion 15, and the surface of the first protective film 23 is provided with unevenness 23 a for suppressing slippage of ultrasonic vibration.
  • the second protective film 24 is provided so as to cover the surface of the second joint resin coating portion 16, and the surface of the second protective film 24 is provided with unevenness 24 a for suppressing slippage of ultrasonic vibration. It has been.
  • the unevenness 23a is provided on the surface of the first protective film 23 and the unevenness 24a is provided on the surface of the second protective film 24, when performing ultrasonic bonding, both the unevenness 23a, 24a Ultrasonic bonding can be performed while suppressing slippage of sonic vibrations and the occurrence of bonding failure and position shift due to this, and the resin substrate structure 105 with good bonding can be obtained.
  • Embodiment 6 With reference to FIG. 12, the resin substrate structure in Embodiment 6 based on this invention is demonstrated. A cross-sectional view of the resin substrate structure 106 in the present embodiment is shown in FIG.
  • the second member 52 is the mother substrate 30.
  • the resin substrate structure 106 includes the first metal film 13, the first member 51 including the one-layer thermoplastic resin layer 2 or the laminate 1 of the two or more thermoplastic resin layers 2, and the second metal film. And a second member 52 having 14. At least a part of the first metal film 13 and at least a part of the second metal film 14 are joined so as to overlap each other. At the interface where the first metal film 13 and the second metal film 14 are joined, the first metal film 13 and the second metal film 14 are in a metallurgical bond state.
  • the first member 51 includes a first joint resin coating portion that is a portion where the thermoplastic resin layer 2 overlaps a portion where the first metal film 13 and the second metal film 14 overlap.
  • a first protective film 23 is provided so as to cover the surface of the first bonding portion resin coating portion. The surface of the first protective film 23 is provided with irregularities 23 a for suppressing slippage of ultrasonic vibration.
  • the second member 52 is the mother substrate 30, and the first protective film 23 is provided so as to cover the surface of the first joint resin coating portion. If it is the structure by which the unevenness
  • FIG. 13 shows a flowchart of the method for manufacturing the resin substrate structure in the present embodiment.
  • the manufacturing method of the resin substrate structure in the present embodiment includes the first metal film 13, includes the one-layer thermoplastic resin layer 2 or the laminate 1 of two or more thermoplastic resin layers 2, and the first Step S1 of preparing the first member 51 having the irregularities 15a on the surface of the first joint resin coating portion 15 that is a portion overlapping the metal film 13, and the step of preparing the second member 52 having the second metal film 14 Step S3 in which S2, the first member 51, and the second member 52 are arranged in a state where at least a part of the first metal film 13 and at least a part of the second metal film 14 are in contact with each other and overlap each other (see FIG. 2). ) And a step S4 (see FIG. 3) in which ultrasonic vibration is relatively applied between the first metal film 13 and the second metal film 14 to join them together.
  • the resin substrate structure 101 as shown in FIG. 1 can be obtained.
  • step S4 since the unevenness 15a is provided on the surface of the first joint portion resin coating portion 15 of the first member 51, in step S4, the ultrasonic vibration slips and the joint failure or misalignment caused thereby. Ultrasonic bonding can be performed while suppressing generation.
  • the first joint resin coating portion 15 of the first member 51 is thinner than the portion other than the first joint resin coating portion 15. Preferably it is. Such thinning makes it easier to transmit ultrasonic vibration to the bonding interface in step S4.
  • the second member 52 includes one layer of the thermoplastic resin layer 2 or the laminate 1 of the two or more thermoplastic resin layers 2 and joins them S4. Then, it is preferable that the 1st member 51 and the 2nd member 52 are mutually welded and joined in the part which the thermoplastic resin layers 2 contact
  • the second member 52 is also a laminate of a thermoplastic resin layer, but the type of the second member 52 is not limited to this in carrying out the method of manufacturing the resin substrate structure.
  • the second member 52 may be the mother substrate 30 as illustrated in FIGS. 9 and 12.
  • Embodiment 8 A method for manufacturing a resin substrate structure in Embodiment 8 based on the present invention will be described.
  • the method for manufacturing a resin substrate structure in the present embodiment includes a first metal film, includes a thermoplastic resin layer of one layer or a laminate of two or more thermoplastic resin layers, and the first metal film includes A step of preparing a first member having a first joint resin coating portion which is an overlapping portion, a step of preparing a second member having a second metal film, and the first member and the second member. A step of disposing at least a part of the first metal film and at least a part of the second metal film in contact with each other and overlapping each other; and relatively between the first metal film and the second metal film And applying ultrasonic vibration to join the two.
  • the first member includes a first protective film that covers a surface of the first joint resin coating portion, and the surface of the first protective film is uneven. It has been.
  • the unevenness is provided on the surface of the first protective film that covers the surface of the first joint resin coating portion of the first member, slippage of ultrasonic vibrations and joint failure and positional displacement caused thereby. Ultrasonic bonding can be performed while suppressing generation (see FIG. 12).
  • the term “unevenness” used herein refers to unevenness for suppressing slippage of ultrasonic vibration.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Combinations Of Printed Boards (AREA)

Abstract

樹脂基板構造体(101)は、第1金属膜(13)を有し、1層の熱可塑性樹脂層(2)または2層以上の熱可塑性樹脂層(2)の積層体(1)を含む第1部材(51)と、第2金属膜(14)を有する第2部材(52)とを備える。第1金属膜(13)の少なくとも一部と第2金属膜(14)の少なくとも一部とが互いに重なる状態で接合されている。第1金属膜(13)と第2金属膜(14)とが接合されている界面では、第1金属膜(13)と第2金属膜(14)とが冶金結合した状態となっている。第1部材(51)は、第1金属膜(13)と第2金属膜(14)とが重なっている部分に熱可塑性樹脂層(2)が重なる部分である第1接合部樹脂被覆部(15)を備え、第1接合部樹脂被覆部(15)の表面には、超音波振動の滑りを抑えるための凹凸(15a)が設けられている。

Description

樹脂基板構造体およびその製造方法
 本発明は、樹脂基板構造体およびその製造方法に関するものである。
 配線基板同士の接合方法として、超音波振動を与えて金属同士を融着させる技術が、特開2001-7511号公報(特許文献1)に記載されている。特許文献1の第1実施形態では、PET製フィルムの表面に銅箔をエッチングしてなる導体パターンが形成されたものと、PET製フィルムの表面にアルミ箔をエッチングしてなる導体パターンが形成されたものとを用い、銅箔の導体パターンとアルミ箔の導体パターンとが当接するように重ね合わせ、超音波ホーンとアンビルとによって挟み込んで超音波振動を与えている。特許文献1の第2実施形態では、超音波ホーンとアンビルとの少なくともいずれか一方の端面に複数の突部が設けられた構成となっており、金属の塑性流動によって生じた孔を通して樹脂製基体同士を超音波振動によって融着させるものとなっている。
 フレキシブル配線基板の端子部の超音波接合によって接合する際に、先端部に波形が形成された超音波ホーンを用いることが、特開2006-24590号公報(特許文献2)に記載されている。
特開2001-7511号公報 特開2006-24590号公報
 互いに超音波接合される2つの配線基板のうち、少なくとも一方が熱可塑性樹脂層を含む配線基板である場合、特許文献1に第1実施形態として記載された方法では、熱可塑性樹脂のフレキシブル性に起因する超音波振動の滑りが生じるおそれがある。超音波振動の滑りが生じた場合、超音波振動が意図どおりに付与されず接合に不具合が生じたり、配線基板同士に相対的な位置ずれが生じたりするおそれがある。
 特許文献1に第2実施形態として記載された方法では、金属箔の導体パターンに孔をあけることが前提となっているので、導体パターンに孔があいても使用上問題がないようなものの接合にしか採用することができない。また、超音波接合のための治具に位置合わせをした段階で、治具の凹凸に樹脂層が食い込まない限りは、超音波振動の滑りが生じ、接合に不具合が生じたり、治具に対して樹脂層が位置ずれを起こしたりするおそれがある。
 特許文献2に記載された方法では、最初の段階で超音波ホーンがフレキシブル配線基板の表面に食い込むまでの間は、超音波振動の滑りにより、接合に不具合が生じたり、位置ずれが生じたりするおそれがある。
 そこで、本発明は、超音波振動の滑りおよびこれによる接合不具合や位置ずれの発生を抑制しつつ超音波接合をすることができる、樹脂基板構造体およびその製造方法を提供することを目的とする。
 上記目的を達成するため、本発明に基づく樹脂基板構造体は、第1金属膜を有し、1層の熱可塑性樹脂層または2層以上の熱可塑性樹脂層の積層体を含む第1部材と、第2金属膜を有する第2部材とを備え、上記第1金属膜の少なくとも一部と上記第2金属膜の少なくとも一部とが互いに重なる状態で接合されており、上記第1金属膜と上記第2金属膜とが接合されている界面では、上記第1金属膜と上記第2金属膜とが冶金結合した状態となっており、上記第1部材は、上記第1金属膜と上記第2金属膜とが重なっている部分に熱可塑性樹脂層が重なる部分である第1接合部樹脂被覆部を備え、上記第1接合部樹脂被覆部の表面には、超音波振動の滑りを抑えるための凹凸が設けられている。
 本発明によれば、第1接合部樹脂被覆部の表面に、超音波振動の滑りを抑えるための凹凸が設けられているので、超音波振動の滑りおよびこれによる接合不具合や位置ずれの発生を抑制しつつ超音波接合をすることができ、良好な接合がなされた樹脂基板構造体とすることができる。
本発明に基づく実施の形態1における樹脂基板構造体の断面図である。 本発明に基づく実施の形態1における樹脂基板構造体を得るために、第1部材と第2部材とを組み合わせる様子の説明図である。 本発明に基づく実施の形態1における樹脂基板構造体を得るために超音波接合を行なう様子の説明図である。 本発明に基づく実施の形態1における樹脂基板構造体に含まれる第1金属膜と第2金属膜との間の接合箇所近傍の拡大断面図である。 本発明に基づく実施の形態2における樹脂基板構造体の断面図である。 接合箇所の金属膜のパターンの第1の例の平面図である。 接合箇所の金属膜のパターンの第2の例の平面図である。 接合箇所の金属膜のパターンの第3の例の平面図である。 本発明に基づく実施の形態3における樹脂基板構造体の断面図である。 本発明に基づく実施の形態4における樹脂基板構造体の断面図である。 本発明に基づく実施の形態5における樹脂基板構造体の断面図である。 本発明に基づく実施の形態6における樹脂基板構造体の断面図である。 本発明に基づく実施の形態7における樹脂基板構造体の製造方法のフローチャートである。
 図面において示す寸法比は、必ずしも忠実に現実のとおりを表しているとは限らず、説明の便宜のために寸法比を誇張して示している場合がある。以下の説明において、上または下の概念に言及する際には、絶対的な上または下を意味するものではなく、図示された姿勢の中での相対的な上または下を意味するものである。
 (実施の形態1)
 図1~図4を参照して、本発明に基づく実施の形態1における樹脂基板構造体について説明する。本実施の形態における樹脂基板構造体101の断面図を図1に示す。
 樹脂基板構造体101は、第1金属膜13を有し、1層の熱可塑性樹脂層2または2層以上の熱可塑性樹脂層2の積層体1を含む第1部材51と、第2金属膜14を有する第2部材52とを備える。第1金属膜13の少なくとも一部と第2金属膜14の少なくとも一部とが互いに重なる状態で接合されている。第1金属膜13と第2金属膜14とが接合されている界面では、第1金属膜13と第2金属膜14とが冶金結合した状態となっている。第1部材51は、第1金属膜13と第2金属膜14とが重なっている部分に熱可塑性樹脂層2が重なる部分である第1接合部樹脂被覆部15を備える。第1接合部樹脂被覆部15の表面には、超音波振動の滑りを抑えるための凹凸15aが設けられている。
 第1金属膜13と第2金属膜14との間の冶金結合は、元々別々のものであった第1金属膜13と第2金属膜14とを超音波接合したことによって得られたものである。超音波接合の際には、接合しようとする界面に元々存在していた酸化被膜、汚れなどが超音波振動により取り除かれ、金属の結晶粒同士が原子間距離になるまで接近することで、第1金属膜13と第2金属膜14との間で強力な引力が働き、冶金結合が生成される。樹脂基板構造体101は、このように得られる冶金結合状態の部分を備えている。
 樹脂基板構造体101は、図2に示すように、元々別々のものとして用意された第1部材51と第2部材52とを組み合わせて接合することによって得ることができる。図2に示すように、第1部材51の第1接合部樹脂被覆部15と第2部材52の第2接合部樹脂被覆部16とを重ね合わせる。図3に示すように、第1接合部樹脂被覆部15と第2接合部樹脂被覆部16とを重ねたものを、アンビル62の上面に載せ、上側から超音波ホーン61で矢印91の向きに加圧する。超音波ホーン61およびアンビル62は、それぞれ超音波接合装置の一部である。ここでは超音波ホーン61の下面およびアンビル62の上面を平坦なものとして表示しているが、これらの面には摩擦力を高めるための微小な凹凸が形成されていてもよい。図3において矢印91の向きに加圧された状態で、矢印92に示すように超音波ホーン61を介して超音波ホーン61に超音波振動をさせる。その結果、第1金属膜13と第2金属膜14との間では、図4に拡大して示すように、超音波接合の結果物としての冶金結合が成立している。同時に、その周囲の熱可塑性樹脂層2同士も超音波振動によって界面が発熱したことによって互いに溶着している。図4に示される破線は、界面の位置を模式的に示したものである。
 ここでは、好ましい一例を示したが、第1部材51および第2部材52の形状はこれに限らない。
 本実施の形態では、第1接合部樹脂被覆部15の表面に、超音波振動の滑りを抑えるための凹凸15aが設けられているので、第1部材51における超音波振動の滑りを抑制することができ、その結果、接合不具合や位置ずれを抑制しつつ超音波接合をすることができ、良好な接合がなされた樹脂基板構造体101とすることができる。
 第1部材51のうち第1接合部樹脂被覆部15は、第1接合部樹脂被覆部15以外の部分に比べて薄くなっていることが好ましい。第1接合部樹脂被覆部15がこのように薄くなっていることにより、超音波振動を接合界面に伝えやすくなる。
 (実施の形態2)
 実施の形態1で示した樹脂基板構造体101では、第1金属膜13と第2金属膜14との接合箇所において、これらの導体膜の上下から同じように層間接続導体が延在して接続していたが、このような配置に限らない。
 図5を参照して、本発明に基づく実施の形態2における樹脂基板構造体102について説明する。
 樹脂基板構造体102では、第1金属膜13には第1部材51の内部から第1層間接続導体17が接続しており、第2金属膜14には、第2金属膜14に対して垂直な方向から見て第1層間接続導体17とは異なる位置において第2部材52の内部から第2層間接続導体18が接続している。
 本実施の形態に示したように、互いに接合される第1金属膜13と第2金属膜14との間で異なる位置において層間接続導体が配置されている場合においても、何の対策も採らなければ本来、超音波振動の滑りが生じやすいが、本実施の形態では第1接合部樹脂被覆部15の表面に超音波振動の滑りを抑えるための凹凸15aが設けられているので、超音波振動の滑りに起因する接合不具合や位置ずれの発生を抑制することができ、その恩恵を大きく享受することができる。
 金属膜同士が超音波接合による冶金接合をなしている箇所の周囲で熱可塑性樹脂層同士が溶着していることは必須ではないが、実施の形態1,2で示したように、熱可塑性樹脂層同士も当接して互いに融着していることが好ましい(図4参照)。すなわち、第2部材52は、1層の熱可塑性樹脂層2または2層以上の熱可塑性樹脂層2の積層体を含み、第1部材51と第2部材52とは、熱可塑性樹脂層2同士が接する部分において互いに溶着していることが好ましい。このように金属膜同士に加えて熱可塑性樹脂層同士も接合されていることによって、強固で安定した構造とすることができる。このように熱可塑性樹脂層同士も接合されている構成は、超音波接合の際に、超音波振動の条件を調整することにより実現することができる。特に、超音波ホーンが接合対象物と当接する面を下から見たときの大きさおよびアンビルが接合対象物と当接する面を上から見たときの大きさを、いずれも金属膜の大きさよりも大きくすることにより、このように金属膜同士に加えて熱可塑性樹脂層同士も接合されている構成を容易に得ることができる。
 第2部材52が1層の熱可塑性樹脂層2または2層以上の熱可塑性樹脂層2の積層体であることは必須ではない。第2部材52は、樹脂多層基板ではない部材であってもよい。第2部材52は、熱可塑性樹脂層を含まない部材であってもよい。すなわち、第1部材51のみが熱可塑性樹脂層を含む部材であれば足りる。
 第2部材52が、1層の熱可塑性樹脂層2または2層以上の熱可塑性樹脂層2の積層体を含み、第1部材51と第2部材52とは、熱可塑性樹脂層2同士が接する部分において互いに溶着しているような構成においては、さらに以下の構成を備えることが好ましい。この場合、第2部材52は、第1金属膜13と第2金属膜14とが重なっている部分に熱可塑性樹脂層2が重なる部分である第2接合部樹脂被覆部16を備え、第2接合部樹脂被覆部16の表面には、超音波振動の滑りを抑えるための凹凸16aが設けられていることが好ましい。図1および図5に示した例では、既にこの構成を備えている。このように、第2接合部樹脂被覆部16の表面に凹凸16aが設けられていれば、第1接合部樹脂被覆部15側だけでなく第2接合部樹脂被覆部16側からも、滑りにくい状態で保持して超音波振動を与えることができるので、より確実に超音波振動の滑りを抑制することができ、その結果、接合不具合や位置ずれの発生を抑制しつつ良好な超音波接合をすることができる。
 ここまで、凹凸15a,16aについて断面図で参照して言及してきたが、凹凸15aを上から見たとき、または、凹凸16aを下から見たときのパターンについて説明する。
 第1接合部樹脂被覆部15を上から見たときの一例を図6に示す。説明の便宜のために、図6では、凹凸15aのうち低い部分にハッチングを付して表示している。ハッチングが付されていない白い部分は、ハッチングを付した部分に比べて高くなっている。ここで示した例では、凹凸15aは、第1接合部樹脂被覆部15の長手方向(図6における左右方向)に垂直な方向に延在する直線状の溝を繰り返すことによって縞模様として形成されている。この縞模様の方向は、あくまで一例であり、これに限らない。凹凸15aは、たとえば図7に示すように、第1接合部樹脂被覆部15の長手方向(図7における左右方向)に平行な方向に延在する直線状の溝を繰り返すことによって縞模様として形成されていてもよい。
 凹凸15aは、縞模様には限らない。凹凸15aは、たとえば図8に示すように、市松模様として形成されていてもよい。図8においても、凹凸15aのうち低い部分にハッチングを付して表示している。
 図6~図8を参照して説明した事項は、第2接合部樹脂被覆部16に設けられる凹凸16aについても同様である。凹凸15a,16aは、縞模様、市松模様に限らずその他の任意のパターンとなっていてもよく、ランダムなパターンであってもよい。
 (実施の形態3)
 図9を参照して、本発明に基づく実施の形態3における樹脂基板構造体について説明する。本実施の形態における樹脂基板構造体103の断面図を図9に示す。
 樹脂基板構造体103は、第1金属膜13を有し、1層の熱可塑性樹脂層2または2層以上の熱可塑性樹脂層2の積層体1を含む第1部材51と、第2金属膜14を有する第2部材52とを備える。第2部材52はマザー基板30である。マザー基板30は、熱可塑性樹脂層の積層体を含まないものであってもよい。マザー基板30は、たとえばプリント配線板であってもよい。第1金属膜13の少なくとも一部と第2金属膜14の少なくとも一部とが互いに重なる状態で接合されている。第1金属膜13と第2金属膜14とが接合されている界面では、第1金属膜13と第2金属膜14とが冶金結合した状態となっている。第2金属膜14は、マザー基板30の表面に設けられたパッド電極31である。第1部材51は、第1金属膜13と第2金属膜14とが重なっている部分に熱可塑性樹脂層2が重なる部分である第1接合部樹脂被覆部15を備える。第1接合部樹脂被覆部15の表面には、超音波振動の滑りを抑えるための凹凸15aが設けられている。
 本実施の形態においても、実施の形態1と同様に、超音波振動の滑りおよびこれによる接合不具合や位置ずれの発生を抑制しつつ超音波接合をすることができ、良好な接合がなされた樹脂基板構造体103とすることができる。本実施の形態で示したように、熱可塑性樹脂層の積層体と、そうでないマザー基板との間の接続に関しても、第1接合部樹脂被覆部15の表面に、超音波振動の滑りを抑えるための凹凸15aを設けることで本発明の効果を享受することができる。
 (実施の形態4)
 図10を参照して、本発明に基づく実施の形態4における樹脂基板構造体について説明する。本実施の形態における樹脂基板構造体104の断面図を図10に示す。
 樹脂基板構造体104は、実施の形態1で示した樹脂基板構造体101と類似しているが、以下の点で異なる。
 樹脂基板構造体104においては、第1接合部樹脂被覆部15の表面を覆うように第1保護膜23が設けられており、第1保護膜23の表面には、超音波振動の滑りを抑えるための凹凸23aが設けられている。第1保護膜23は、たとえばレジスト膜であってもよい。第1保護膜23は、たとえばカバーレイフィルムなどの樹脂膜であってもよい。
 本実施の形態では、第1保護膜23が設けられているので、第1接合部樹脂被覆部15を保護することができる。第1保護膜23の表面に凹凸23aが設けられているので、第1接合部樹脂被覆部15を覆うように第1保護膜23を設けた後の状態で超音波接合を行なうとしても、凹凸23aによって超音波振動の滑りおよびこれによる接合不具合や位置ずれの発生を抑制しつつ超音波接合をすることができる。その結果、樹脂基板構造体104は、良好な接合がなされたものとすることができる。
 特に、第1接合部樹脂被覆部15が他の部分より薄くなっている場合には、このような保護膜を設けることによって補強の効果を大きく得ることができるので、信頼性を増すことができる。
 (実施の形態5)
 図11を参照して、本発明に基づく実施の形態5における樹脂基板構造体について説明する。本実施の形態における樹脂基板構造体105の断面図を図11に示す。
 樹脂基板構造体105は、実施の形態4で示した樹脂基板構造体104と類似しているが、以下の点で異なる。
 第1接合部樹脂被覆部15の表面を覆うように第1保護膜23が設けられており、第1保護膜23の表面には、超音波振動の滑りを抑えるための凹凸23aが設けられており、第2接合部樹脂被覆部16の表面を覆うように第2保護膜24が設けられており、第2保護膜24の表面には、超音波振動の滑りを抑えるための凹凸24aが設けられている。
 本実施の形態では、第1保護膜23だけでなく第2保護膜24も設けられているので、接合箇所を、第1接合部樹脂被覆部15の側だけでなく第2接合部樹脂被覆部16の側からも保護することができる。第1保護膜23の表面に凹凸23aが設けられ、かつ、第2保護膜24の表面に凹凸24aが設けられているので、超音波接合を行なう際には、凹凸23a,24aの両方によって超音波振動の滑りおよびこれによる接合不具合や位置ずれの発生を抑制しつつ超音波接合をすることができ、良好な接合がなされた樹脂基板構造体105とすることができる。
 (実施の形態6)
 図12を参照して、本発明に基づく実施の形態6における樹脂基板構造体について説明する。本実施の形態における樹脂基板構造体106の断面図を図12に示す。
 樹脂基板構造体106においては、第2部材52がマザー基板30である。樹脂基板構造体106は、第1金属膜13を有し、1層の熱可塑性樹脂層2または2層以上の熱可塑性樹脂層2の積層体1を含む第1部材51と、第2金属膜14を有する第2部材52とを備える。第1金属膜13の少なくとも一部と第2金属膜14の少なくとも一部とが互いに重なる状態で接合されている。第1金属膜13と第2金属膜14とが接合されている界面では、第1金属膜13と第2金属膜14とが冶金結合した状態となっている。第1部材51は、第1金属膜13と第2金属膜14とが重なっている部分に熱可塑性樹脂層2が重なる部分である第1接合部樹脂被覆部を備える。第1接合部樹脂被覆部の表面を覆うように第1保護膜23が設けられている。第1保護膜23の表面には、超音波振動の滑りを抑えるための凹凸23aが設けられている。
 本実施の形態で示したように、第2部材52がマザー基板30であって、第1接合部樹脂被覆部の表面を覆うように第1保護膜23が設けられ、第1保護膜23の表面に凹凸23aが設けられている構成であれば、超音波接合を行なう際に凹凸23aによって超音波振動の滑りの発生を抑制しつつ超音波接合をすることができる。その結果、樹脂基板構造体106は、良好な接合がなされたものとすることができる。
 (実施の形態7)
 図13、および図1~図3を参照して、本発明に基づく実施の形態7における樹脂基板構造体の製造方法について説明する。本実施の形態における樹脂基板構造体の製造方法のフローチャートを図13に示す。
 本実施の形態における樹脂基板構造体の製造方法は、第1金属膜13を有し、1層の熱可塑性樹脂層2または2層以上の熱可塑性樹脂層2の積層体1を含み、第1金属膜13に重なる部分である第1接合部樹脂被覆部15の表面に凹凸15aを有する、第1部材51を用意する工程S1と、第2金属膜14を有する第2部材52を用意する工程S2と、第1部材51と第2部材52とを、第1金属膜13の少なくとも一部と第2金属膜14の少なくとも一部とが互いに接して重なる状態に配置する工程S3(図2参照)と、第1金属膜13と第2金属膜14との間に相対的に超音波振動を付与して両者を接合する工程S4(図3参照)とを含む。これにより、図1に示すような樹脂基板構造体101を得ることができる。
 本実施の形態では、第1部材51の第1接合部樹脂被覆部15の表面に、凹凸15aが設けられているので、工程S4では、超音波振動の滑りおよびこれによる接合不具合や位置ずれの発生を抑制しつつ超音波接合をすることができる。
 なお、本実施の形態における樹脂基板構造体の製造方法においては、第1部材51のうち第1接合部樹脂被覆部15は、第1接合部樹脂被覆部15以外の部分に比べて薄くなっていることが好ましい。このように薄くなっていることにより、工程S4において超音波振動を接合界面に伝えやすくなる。
 本実施の形態における樹脂基板構造体の製造方法においては、第2部材52は、1層の熱可塑性樹脂層2または2層以上の熱可塑性樹脂層2の積層体1を含み、接合する工程S4では、第1部材51と第2部材52とは、熱可塑性樹脂層2同士が接する部分において互いに溶着して接合されることが好ましい。このように金属膜同士に加えて熱可塑性樹脂層同士も互いに溶着して接合されることによって、強固で安定した構造を得ることができる。
 図1~図3では、第2部材52も熱可塑性樹脂層の積層体となっているが、樹脂基板構造体の製造方法を実施する上では、第2部材52の種類はこれに限らない。本実施の形態における樹脂基板構造体の製造方法においては、図9および図12に例示するように、第2部材52は、マザー基板30であってもよい。
 (実施の形態8)
 本発明に基づく実施の形態8における樹脂基板構造体の製造方法について説明する。
 本実施の形態における樹脂基板構造体の製造方法は、第1金属膜を有し、1層の熱可塑性樹脂層または2層以上の熱可塑性樹脂層の積層体を含み、前記第1金属膜に重なる部分である第1接合部樹脂被覆部を有する、第1部材を用意する工程と、第2金属膜を有する第2部材を用意する工程と、前記第1部材と前記第2部材とを、前記第1金属膜の少なくとも一部と前記第2金属膜の少なくとも一部とが互いに接して重なる状態に配置する工程と、前記第1金属膜と前記第2金属膜との間に相対的に超音波振動を付与して両者を接合する工程とを含む。ただし、前記第1部材を用意する工程において、前記第1部材は、前記第1接合部樹脂被覆部の表面を覆う第1保護膜を備えており、前記第1保護膜の表面に凹凸が設けられている。
 本実施の形態では、第1部材の第1接合部樹脂被覆部の表面を覆う第1保護膜の表面に凹凸が設けられているので、超音波振動の滑りおよびこれによる接合不具合や位置ずれの発生を抑制しつつ超音波接合をすることができる(図12参照)。ここでいう「凹凸」とは、超音波振動の滑りを抑えるための凹凸である。
 なお、上記実施の形態のうち複数を適宜組み合わせて採用してもよい。
 なお、今回開示した上記実施の形態はすべての点で例示であって制限的なものではない。本発明の範囲は上記した説明ではなくて請求の範囲によって示され、請求の範囲と均等の意味および範囲内でのすべての変更を含むものである。
 1 積層体、2 熱可塑性樹脂層、6 層間接続導体、7 導体パターン、13 第1金属膜、14 第2金属膜、15 第1接合部樹脂被覆部、15a,16a,23a,24a 凹凸、16 第2接合部樹脂被覆部、17 第1層間接続導体、18 第2層間接続導体、23 第1保護膜、24 第2保護膜、30 マザー基板、31 パッド電極、51 第1部材、52 第2部材、61 超音波ホーン、62 アンビル、91,92 矢印、101,102 樹脂基板構造体。

Claims (13)

  1.  第1金属膜を有し、1層の熱可塑性樹脂層または2層以上の熱可塑性樹脂層の積層体を含む第1部材と、
     第2金属膜を有する第2部材とを備え、
     前記第1金属膜の少なくとも一部と前記第2金属膜の少なくとも一部とが互いに重なる状態で接合されており、前記第1金属膜と前記第2金属膜とが接合されている界面では、前記第1金属膜と前記第2金属膜とが冶金結合した状態となっており、
     前記第1部材は、前記第1金属膜と前記第2金属膜とが重なっている部分に熱可塑性樹脂層が重なる部分である第1接合部樹脂被覆部を備え、
     前記第1接合部樹脂被覆部の表面には、超音波振動の滑りを抑えるための凹凸が設けられている、樹脂基板構造体。
  2.  前記第1部材のうち前記第1接合部樹脂被覆部は、前記第1接合部樹脂被覆部以外の部分に比べて薄くなっている、請求項1に記載の樹脂基板構造体。
  3.  前記第2部材は、1層の熱可塑性樹脂層または2層以上の熱可塑性樹脂層の積層体を含み、前記第1部材と前記第2部材とは、熱可塑性樹脂層同士が接する部分において互いに溶着している、請求項1または2に記載の樹脂基板構造体。
  4.  前記第2部材は、前記第1金属膜と前記第2金属膜とが重なっている部分に熱可塑性樹脂層が重なる部分である第2接合部樹脂被覆部を備え、
     前記第2接合部樹脂被覆部の表面には、超音波振動の滑りを抑えるための凹凸が設けられている、請求項3に記載の樹脂基板構造体。
  5.  前記第2部材は、マザー基板である、請求項1から3のいずれかに記載の樹脂基板構造体。
  6.  前記第1接合部樹脂被覆部の表面を覆うように第1保護膜が設けられており、前記第1保護膜の表面には、超音波振動の滑りを抑えるための凹凸が設けられている、請求項1から5のいずれかに記載の樹脂基板構造体。
  7.  前記第1接合部樹脂被覆部の表面を覆うように第1保護膜が設けられており、前記第1保護膜の表面には、超音波振動の滑りを抑えるための凹凸が設けられており、
     前記第2接合部樹脂被覆部の表面を覆うように第2保護膜が設けられており、前記第2保護膜の表面には、超音波振動の滑りを抑えるための凹凸が設けられている、請求項4に記載の樹脂基板構造体。
  8.  第1金属膜を有し、1層の熱可塑性樹脂層または2層以上の熱可塑性樹脂層の積層体を含む第1部材と、
     第2金属膜を有する第2部材とを備え、
     前記第1金属膜の少なくとも一部と前記第2金属膜の少なくとも一部とが互いに重なる状態で接合されており、前記第1金属膜と前記第2金属膜とが接合されている界面では、前記第1金属膜と前記第2金属膜とが冶金結合した状態となっており、
     前記第1部材は、前記第1金属膜と前記第2金属膜とが重なっている部分に熱可塑性樹脂層が重なる部分である第1接合部樹脂被覆部を備え、
     前記第1接合部樹脂被覆部の表面を覆うように第1保護膜が設けられており、前記第1保護膜の表面には、超音波振動の滑りを抑えるための凹凸が設けられている、樹脂基板構造体。
  9.  第1金属膜を有し、1層の熱可塑性樹脂層または2層以上の熱可塑性樹脂層の積層体を含み、前記第1金属膜に重なる部分である第1接合部樹脂被覆部の表面に凹凸を有する、第1部材を用意する工程と、
     第2金属膜を有する第2部材を用意する工程と、
     前記第1部材と前記第2部材とを、前記第1金属膜の少なくとも一部と前記第2金属膜の少なくとも一部とが互いに接して重なる状態に配置する工程と、
     前記第1金属膜と前記第2金属膜との間に相対的に超音波振動を付与して両者を接合する工程とを含む、樹脂基板構造体の製造方法。
  10.  前記第1部材のうち前記第1接合部樹脂被覆部は、前記第1接合部樹脂被覆部以外の部分に比べて薄くなっている、請求項9に記載の樹脂基板構造体の製造方法。
  11.  前記第2部材は、1層の熱可塑性樹脂層または2層以上の熱可塑性樹脂層の積層体を含み、前記接合する工程では、前記第1部材と前記第2部材とは、熱可塑性樹脂層同士が接する部分において互いに溶着して接合される、請求項9または10に記載の樹脂基板構造体の製造方法。
  12.  前記第2部材は、マザー基板である、請求項9または10に記載の樹脂基板構造体の製造方法。
  13.  第1金属膜を有し、1層の熱可塑性樹脂層または2層以上の熱可塑性樹脂層の積層体を含み、前記第1金属膜に重なる部分である第1接合部樹脂被覆部を有する、第1部材を用意する工程と、
     第2金属膜を有する第2部材を用意する工程と、
     前記第1部材と前記第2部材とを、前記第1金属膜の少なくとも一部と前記第2金属膜の少なくとも一部とが互いに接して重なる状態に配置する工程と、
     前記第1金属膜と前記第2金属膜との間に相対的に超音波振動を付与して両者を接合する工程とを含み、
     前記第1部材を用意する工程において、前記第1部材は、前記第1接合部樹脂被覆部の表面を覆う第1保護膜を備えており、前記第1保護膜の表面には、超音波振動の滑りを抑えるための凹凸が設けられている、樹脂基板構造体の製造方法。
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