WO2010150811A1 - 樹脂材のレーザー溶着方法 - Google Patents

樹脂材のレーザー溶着方法 Download PDF

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Publication number
WO2010150811A1
WO2010150811A1 PCT/JP2010/060631 JP2010060631W WO2010150811A1 WO 2010150811 A1 WO2010150811 A1 WO 2010150811A1 JP 2010060631 W JP2010060631 W JP 2010060631W WO 2010150811 A1 WO2010150811 A1 WO 2010150811A1
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WO
WIPO (PCT)
Prior art keywords
resin material
protrusion
welding method
laser
laser light
Prior art date
Application number
PCT/JP2010/060631
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English (en)
French (fr)
Inventor
浩司 浦瀬
康志 永野
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パナソニック電工株式会社
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Publication of WO2010150811A1 publication Critical patent/WO2010150811A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1635—Laser beams characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. laser transmission welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1654—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114—Single butt joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2424—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain
    • B29C66/24243—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain forming a quadrilateral
    • B29C66/24244—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain forming a quadrilateral forming a rectangle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/302—Particular design of joint configurations the area to be joined comprising melt initiators
    • B29C66/3022—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined
    • B29C66/30223—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined said melt initiators being rib-like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
    • B29C66/324—Avoiding burr formation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
    • B29C66/53461—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/65—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles with a relative motion between the article and the welding tool
    • B29C66/652—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles with a relative motion between the article and the welding tool moving the welding tool around the fixed article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General 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
    • B29C66/73—General 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
    • B29C66/739—General 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
    • B29C66/7392—General 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
    • B29C66/73921—General 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/836—Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General 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
    • B29C66/71—General 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 composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2033/00—Use of polymers of unsaturated acids or derivatives thereof as moulding material
    • B29K2033/04—Polymers of esters
    • B29K2033/12—Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2059/00—Use of polyacetals, e.g. POM, i.e. polyoxymethylene or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B29K2067/006—PBT, i.e. polybutylene terephthalate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2069/00—Use of PC, i.e. polycarbonates or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2081/00—Use of polymers having sulfur, with or without nitrogen, oxygen or carbon only, in the main chain, as moulding material
    • B29K2081/04—Polysulfides, e.g. PPS, i.e. polyphenylene sulfide or derivatives thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7162—Boxes, cartons, cases

Definitions

  • the present invention relates to a laser welding method for resin materials.
  • FIG. 5A, 5B and 5C show the laser welding method of Conventional Example 1.
  • FIG. 5A a transparent resin material 501 having a substantially rectangular cross section and an absorbent resin material 502 having a substantially rectangular cross section are overlapped, and a pressure is applied so that both resin materials abut with a pressing jig (not shown).
  • the laser beam 503 is irradiated from the transparent resin material 501 side.
  • the laser light 503 passes through the transmissive resin material 501 with almost no absorption, and is absorbed near the surface of the absorbent resin material 502.
  • the energy of the absorbed laser beam 503 is converted into heat, and the surface of the absorbent resin material 502 is heated.
  • the joining surface of the absorbent resin material 502 and the joining surface of the permeable resin material 501 are melted to form a molten resin material 504.
  • the molten resin material 504 is cooled and solidified, and the both resin materials are welded to each other.
  • a case body 602 formed of an absorbent resin and a lid formed of a transparent resin 601 can be welded and sealed.
  • the laser beam 503 is irradiated.
  • the resin material is heated, the air in the space is also heated and expands, and rupture occurs.
  • this rupture causes the molten resin material 504 to scatter along the joint surfaces of the two resin materials and to be cooled and solidified in a non-uniform state. Arise.
  • the appearance of the molten resin material 504 is spoiled or outflowed, and the appearance of the molten resin material 504 is impaired by protruding from the resin material body.
  • Conventional example 2 is provided with protrusions on the bonding surface of the absorbent resin material. Then, the protrusions are overlapped so as to come into contact with the joint surface of the transmissive resin material, and the projection is irradiated with laser light from the transmissive resin material side in a state where the joint surfaces of the both resin materials are pressed in the approaching direction. Then, as the protrusions are gradually melted, the distance between the joint surfaces of both resin materials is shortened, and air is gradually discharged. Therefore, the air between the joint surfaces of both resin materials does not expand and burst, and the molten resin material is cooled and solidified in a uniform state, so that the welded state is stabilized.
  • an object of the present invention is to provide a laser welding method for a resin material in which the welding state is stabilized and the welding strength is improved by gradually discharging the air between the joining surfaces during laser light irradiation. is there.
  • an absorptive resin material that absorbs laser light and a transparent resin material that transmits laser light are superposed and pressed, and laser is applied to the joint surface from the transparent resin material side.
  • the absorbent resin material is melted and both resin materials are welded.
  • a projection is provided on the joint surface of the transparent resin material, and scanning is performed by irradiating a laser beam in a state where the projection is pressed so as to contact the joint surface of the absorbent resin material. .
  • the projection provided on the joining surface of the permeable resin material is gradually submerged in the melted absorbent resin material, so that the air between the joining surfaces is gradually discharged to weld the state. Since the welded portion is formed between the surface of the protrusion and the absorbent resin material, the welded area can be increased and the weld strength can be improved.
  • the cross-sectional shape of the protrusion is a polygon.
  • the welding area can be further increased and the welding strength can be increased.
  • At least a corner of the tip of the protrusion has a curved shape.
  • the corner portion at the tip of the protrusion has a curved shape, the stress applied to the corner portion at the tip of the protrusion can be dispersed, so that the strength of the protrusion can be improved.
  • the protrusion is a plurality of protrusions.
  • the welding area can be further increased, and the welding strength can be increased.
  • 1A to 1C are diagrams showing a laser welding method of a resin material according to Embodiment 1 of the present invention. It is a figure which shows schematic structure of the laser welding method of the resin material of Embodiment 2 of this invention. It is a figure which shows schematic structure of the laser welding method of the resin material of Embodiment 3 of this invention. It is a figure which shows schematic structure of the molded article using the laser welding method of the resin material of Embodiment 3 of this invention.
  • 5A to 5C are diagrams showing a conventional laser welding method of a resin material. It is a figure which shows schematic structure of the molded article using the laser welding method of the conventional resin material.
  • (Embodiment 1) 1A to 1C show a laser welding method of a resin material according to the first embodiment of the present invention.
  • FIG. 1A shows the state of the resin material before the laser beam 103 is irradiated.
  • the vertical and horizontal directions with respect to FIG. 1A shows the vertical and horizontal directions with respect to FIG.
  • the transmissive resin material 101 of this embodiment is provided with a projection 101b having a triangular cross section on the lower surface of a permeable resin main body 101a having a substantially rectangular cross section.
  • the left and right side surfaces of the protrusion 101b are formed as slopes that go inward as going downward.
  • the absorbent resin material 102 has a substantially rectangular cross section.
  • a pressing force P11 is applied by a pressing jig (not shown) so that the tip of the protrusion 101b contacts the upper surface of the absorbent resin material 102. Further, by providing the protrusion 101b, a space 104 is formed between the joint surfaces of the two resin materials, which are constituted by the lower surface of the permeable resin material main body 101a and the upper surface of the absorbent resin material 102. ing.
  • the transparent resin material 101 is not particularly limited as long as it has thermoplasticity and has a predetermined transmittance (for example, 15% or more) with respect to laser light.
  • a predetermined transmittance for example, 15% or more
  • polyamide (PA) polyethylene (PE), polypropylene (PP), polycarbonate (PC), polyoxymethylene (POM), acrylonitrile-butadiene-styrene (ABS), polybutylene terephthalate (PBT), polyphenylene sulfide (
  • a resin material such as PPS) or acrylic (PMME) is used.
  • Such a resin material coating is not particularly restricted because it allows laser light to pass therethrough, but a pigment is restricted in order to greatly reduce the laser light transmittance.
  • the absorbent resin material 102 is not particularly limited as long as it has thermoplasticity and can absorb without transmitting laser light.
  • a resin material described in the example of the permeable resin material 101 in which a coloring material such as paint or pigment is mixed is used. That is, mixing the pigment increases the light absorption of the resin material, and further increases the amount of heat generated. Therefore, the absorbent resin material 102 is generally easier to melt than the permeable resin material 101.
  • FIG. 1B is a view showing that the laser beam 103 is irradiated and being welded.
  • Laser light 103 is applied to the upper surface of the absorbent resin material 102 from the upper surface of the transparent resin material main body 101a through the protrusion 101b in a state where the pressure P11 is applied downward from the upper side of the transparent resin material 101. Is irradiated. Thereby, the absorbent resin material 102 is melted. And since the pressurizing force P11 is applied, the protrusion 101b gradually sinks into the upper surface of the melted absorbent resin material 102. Further, as the protrusion 101b gradually sinks into the melted absorbent resin material 102, the space 104 between the joint surfaces of both resin materials gradually decreases, and as shown by the arrows in FIG. Air is gradually discharged in the left-right direction.
  • Fig. 1C shows a view after welding.
  • the laser beam 103 By irradiating the laser beam 103 with the pressure P11 applied and causing the entire protrusion 101b to sink into the absorbent resin material 102, the lower surface of the permeable resin material main body 101a and the upper surface of the absorbent resin material 102 abut.
  • the space 104 disappears. Accordingly, since the protrusion 101b gradually sinks, the air between the joint surfaces of both resin materials is gradually discharged, so that the gap between the lower surface of the permeable resin material main body 101a and the upper surface of the absorbent resin material 102 is reduced. No air remains, the expanded air does not burst as in the conventional case, and the molten resin material does not scatter, and the welding state can be stabilized.
  • the protrusion 101b sinks into the melted absorbent resin material 102, so that the melted resin material of the absorbent resin material 102 flows out to the upper surface of the absorbent resin material 102 along the surface of the protrusion 101b.
  • a welded portion 105a formed between the lower surface of the permeable resin material main body 101a and the upper surface of the absorbent resin material 102, and formed between the surface of the protrusion 101b and the slope of the absorbent resin material 102.
  • a welded portion 105 composed of the welded portion 105b is formed. Both resin materials are welded together.
  • the protrusion 101b provided on the transparent resin material 101 side sinks into the absorbent resin material 102 while partially melting. Include.
  • the weld portion 105b formed between the surface of the protrusion 101b and the inclined surface of the absorbent resin material 102 has a weld portion. Since part of 105 is constituted, the welding area increases. And the welding intensity
  • the welding state is stabilized by gradually discharging air between the joint surfaces of both resin materials, and the surface of the protrusion 101b is stabilized.
  • the weld portion 105b By forming the weld portion 105b, the weld area is increased and the weld strength is improved.
  • the welding area can be further increased, and the welding strength can be further improved.
  • the present embodiment is a laser welding method of a resin material having the same basic configuration as that of the first embodiment, but the shape of the protrusion 201b provided on the lower surface of the transmissive resin material main body 201a is different.
  • the transparent resin material 201 of the present embodiment is provided with a protrusion 201b having a trapezoidal cross section on the lower surface of a transparent resin material main body 201a having a substantially rectangular cross section.
  • the left and right side surfaces of the protrusion 201b are formed as slopes that go inward as going downward, and the lower surface of the protrusion 201b is formed in parallel with the lower surface of the permeable resin main body 201a.
  • the absorptivity is absorbed from the upper surface of the permeable resin material main body 201a through the protrusion 201b.
  • the protrusion 201b sinks into the melted absorbent resin material 202.
  • the cross-sectional shape of the protrusion 201b is trapezoidal, the surface area is larger than that of the triangular shape, so that when the protrusion 201b is submerged in the absorbent resin material 202, the welding area increases, and the welding strength Can be further improved.
  • the length of the upper side of the trapezoidal projection 201b in the left-right direction is A1
  • the length of the lower side of the projection 201b in the left-right direction is B1
  • the present embodiment is a laser welding method of a resin material having the same basic configuration as that of the first embodiment, but the shape of the protrusion 301b provided on the lower surface of the transmissive resin material main body 301a is different.
  • a protrusion 301b having a substantially trapezoidal cross section is provided on the lower surface of a permeable resin main body 301a having a substantially rectangular cross section.
  • the left and right side surfaces of the projection 301b are formed as slopes that go inward as going downward, and the lower surface of the projection 301b is formed in parallel with the lower surface of the permeable resin main body 301a.
  • angular part 301c which makes the side surface and lower surface of the permite
  • the absorbent material in a state where pressure is applied so that the lower surface of the protrusion 301b and the upper surface of the absorbent resin material 302 are in contact with each other, the absorbent material is absorbed from the upper surface of the permeable resin material main body 301a through the protrusion 301b.
  • the protrusion 301 b sinks into the melted absorbent resin material 302.
  • the stress applied to the corner portion 301c can be dispersed, so that the strength of the projection 301b can be improved.
  • the case 400 of the present embodiment includes a substantially rectangular box-shaped case body 402 having an upper surface made of an absorbent resin material, and a plate-shaped lid 401 made of a permeable resin material.
  • a lid 401 is provided over the top. Further, the lower surface of the lid 401 is provided with a protrusion (not shown) shown in any one of the first to third embodiments along the outer peripheral edge, and the protrusion comes into contact with the peripheral edge of the opening of the case main body 402.
  • the laser beam 403 is irradiated from the outer peripheral edge of the upper surface of the lid 401 to the peripheral edge of the opening of the case main body 402 via a projection, and scanning is performed. 3 can stabilize the welded state of the case main body 402 and the lid 401 and improve the weld strength.

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Abstract

　レーザー光を吸収する吸収性樹脂材と、レーザー光を透過させる透過性樹脂材とを重ね合わせて加圧し、その接合面に透過性樹脂材側からレーザー光を照射して走査することで、吸収性樹脂材を溶融させて、両樹脂材を溶着する樹脂材のレーザー溶着方法において、透過性樹脂材本体の下面に突起を設け、突起が吸収性樹脂材の上面に当接するように加圧した状態で、レーザー光を照射して走査する。

Description

樹脂材のレーザー溶着方法
　本発明は、樹脂材のレーザー溶着方法に関するものである。
　従来、レーザー光を吸収する吸収性樹脂材と、レーザー光を透過させる透過性樹脂材とを重ね合わせて加圧し、両樹脂材の接合面に透過性樹脂材側からレーザー光を照射することで、両樹脂材を溶着する樹脂材のレーザー溶着方法が提案されている。
　以下に、従来例１の樹脂材のレーザー溶着方法を説明する。
　図５Ａ、５Ｂ及び５Ｃに、従来例１のレーザー溶着方法を示す。図５Ａにおいて、断面が略矩形状の透過性樹脂材５０１と、断面が略矩形状の吸収性樹脂材５０２とを重ね合わせ、押さえ冶具（図示無し）で両樹脂材が当接するように加圧力Ｐ５１を加えた状態で、透過性樹脂材５０１側からレーザー光５０３を照射する。レーザー光５０３は透過性樹脂材５０１ではほとんど吸収されずに透過して、吸収性樹脂材５０２の表面付近で吸収される。吸収されたレーザー光５０３のエネルギーは熱に変換され、吸収性樹脂材５０２の表面が加熱される。
　その結果、図５Ｂに示すように、吸収性樹脂材５０２の接合面と、透過性樹脂材５０１の接合面とが溶融されて、溶融樹脂材５０４が形成される。そして、レーザー光５０３の照射を停止すると、溶融樹脂材５０４が冷却して固化し、両樹脂材が互いに溶着される。
　また、図６に示すように、レーザー光６０３を照射して走査することで、例えば矩形箱状のケース６００における、吸収性樹脂で形成されたケース本体６０２と、透過性樹脂で形成された蓋６０１とを溶着して密封することができる。
　しかし、透過性樹脂材５０１の接合面、または吸収性樹脂材５０２の接合面に反り等が生じて、両樹脂材の接合面の間に、空間が生じていた場合、レーザー光５０３を照射して樹脂材を加熱すると、空間の空気も加熱されて膨張し、破裂が発生する。図５Ｃに示すように、この破裂によって、溶融樹脂材５０４が、両樹脂材の接合面に沿って飛散し、不均一な状態で冷却固化されるので、溶着状態が不安定となり、リーク不良が生じる。また、溶融樹脂材５０４の飛散または流出により、樹脂材本体からはみ出すことで外観を損ねることとなる。
　そこで、吸収性樹脂材の接合面に突起を設けることによって、レーザー光照射時に両樹脂材の接合面の間の空気を徐々に排出するレーザー溶着方法を従来例２として、以下に説明する（例えば日本国特許公開２００５－２８８９３４号公報を参照）。
　従来例２は、吸収性樹脂材の接合面に、突起が設けられている。そして、突起が透過性樹脂材の接合面に当接するように重ね合わせ、両樹脂材の接合面が近付く方向に加圧された状態で、透過性樹脂材側から突起にレーザー光を照射する。すると、突起が徐々に溶融されることによって、両樹脂材の接合面の間の距離が短くなり空気が徐々に排出されていく。したがって、両樹脂材の接合面の間の空気が膨張して破裂することはなく、溶融樹脂材が均一な状態で冷却固化されるので、溶着状態が安定する。
　しかしながら、従来例２の樹脂材のレーザー溶着方法は、吸収性樹脂材の接合面に設けられた突起を全て溶融させて、両樹脂材を互いに溶着している。したがって、従来例１、２の溶着面は、平面に形成されていた。しかしながら、近年では溶着強度がより向上した樹脂材のレーザー溶着方法が求められていた。
　そこで、本発明の目的は、レーザー光の照射時に接合面の間の空気を徐々に排出することで、溶着状態を安定させると共に、溶着強度が向上した樹脂材のレーザー溶着方法を提供することにある。
　本発明の樹脂材のレーザー溶着方法は、レーザー光を吸収する吸収性樹脂材と、レーザー光を透過させる透過性樹脂材とを重ね合わせて加圧し、その接合面に透過性樹脂材側からレーザー光を照射して走査することで、吸収性樹脂材を溶融させて、両樹脂材を溶着する。本発明の第１の特徴において、透過性樹脂材の接合面に突起を設け、当該突起が吸収性樹脂材の接合面に当接するように加圧した状態で、レーザー光を照射して走査する。この発明では、透過性樹脂材の接合面に設けた突起を、溶融された吸収性樹脂材に徐々に沈み込ませていくことによって、接合面の間の空気を徐々に排出することで溶着状態を安定させることができると共に、突起の表面と吸収性樹脂材の間においても溶着部が形成されるため、溶着面積が増加し溶着強度を向上させることができる。
　一実施形態において、前記突起の断面形状が、多角形である。この発明では、突起の断面形状を多角形にすることで、さらに溶着面積が増加し、溶着強度を増加させることができる。
　一実施形態において、前記突起の先端は、少なくとも角部が曲率形状である。この発明では、突起の先端の角部を曲率形状にすることで、突起の先端の角部にかかる応力を分散させることができるので、突起の強度を向上させることができる。
　一実施形態において、前記突起は、複数の突起である。この発明では、複数の突起を設けることによって、さらに溶着面積が増加し、溶着強度を増加させることができる。
　本発明の好ましい実施形態をさらに詳細に記述する。本発明の他の特徴および利点は、以下の詳細な記述および添付図面に関連して一層良く理解されるものである。
図１Ａ～図１Ｃは、本発明の実施形態１の樹脂材のレーザー溶着方法を示す図である。 本発明の実施形態２の樹脂材のレーザー溶着方法の概略構成を示す図である。 本発明の実施形態３の樹脂材のレーザー溶着方法の概略構成を示す図である。 本発明の実施形態３の樹脂材のレーザー溶着方法を用いた成形品の概略構成を示す図である。 図５Ａ～５Ｃは、従来の樹脂材のレーザー溶着方法を示す図である。 従来の樹脂材のレーザー溶着方法を用いた成形品の概略構成を示す図である。
　以下、本発明の実施の形態を図面に基づいて説明する。
　（実施形態１）
　図１Ａ～１Ｃに、本発明の第１の実施形態の樹脂材のレーザー溶着方法を示す。
　図１Ａに、レーザー光１０３を照射する前の樹脂材の状態を示す。以下、図１Ａに対する上下左右方向を基準とする。
　本実施形態の透過性樹脂材１０１は、断面が略矩形状に形成された透過性樹脂材本体１０１ａの下面に、断面が三角形に形成された突起１０１ｂが設けられている。突起１０１ｂの左右の側面は、下方に向かうにつれて内側に向かう斜面で形成されている。また、吸収性樹脂材１０２は、断面が略矩形状に形成されている。
　そして、突起１０１ｂの先端が、吸収性樹脂材１０２の上面と当接するように、押さえ冶具（図示なし）によって、加圧力Ｐ１１が加えられている。また、突起１０１ｂが設けられていることによって、透過性樹脂材本体１０１ａの下面と吸収性樹脂材１０２の上面とで構成される、両樹脂材の接合面の間には、空間１０４が形成されている。
　ここで、透過性樹脂材１０１は、熱可塑性を有し、レーザー光に対して所定の透過率（例えば、１５％以上）を有するものであれば特に限定されない。そして、例えばポリアミド（ＰＡ）、ポリエチレン（ＰＥ）、ポリプロプレン（ＰＰ）、ポリカーボネート（ＰＣ）、ポリオキシメチレン（ＰＯＭ）、アクリロニトリル－ブタジエン－スチレン（ＡＢＳ）、ポリブチレンテレフタレート（ＰＢＴ）、ポリフェニレンスルフィド（ＰＰＳ）、アクリル（ＰＭＭＥ）等の樹脂材が用いられる。このような樹脂材の塗料についてはレーザー光を透過させるため特に制約されないが、顔料についてはレーザー光の透過率を大きく低下させるため制約される。
　また、吸収性樹脂材１０２は、熱可塑性を有し、レーザー光を透過せずに吸収し得るものであれば特に限定されない。例えば、透過性樹脂材１０１の例で述べた樹脂材に塗料や顔料等の着色材を混入したものが用いられる。つまり、顔料を混入することで樹脂材の光吸収性が高くなり、さらに発熱量も高くなる。従って、吸収性樹脂材１０２は一般的に透過性樹脂材１０１よりも溶融され易い。
　図１Ｂは、レーザー光１０３が照射され、溶着中の図である。透過性樹脂材１０１の上方から、下方に向かって加圧力Ｐ１１が加えられた状態で、透過性樹脂材本体１０１ａの上面から、突起１０１ｂを介して、吸収性樹脂材１０２の上面にレーザー光１０３が照射される。それによって、吸収性樹脂材１０２は溶融される。そして、加圧力Ｐ１１が加えられているため、突起１０１ｂは溶融された吸収性樹脂材１０２の上面に徐々に沈み込んでいく。また、突起１０１ｂが溶融された吸収性樹脂材１０２に徐々に沈み込んでいくことによって、両樹脂材の接合面の間の空間１０４が徐々に小さくなる共に、図１Ｂの矢印で示すように、左右方向へ空気が徐々に排出されていく。
　図１Ｃに、溶着後の図を示す。加圧力Ｐ１１を加えた状態でレーザー光１０３を照射し、突起１０１ｂ全体を吸収性樹脂材１０２に沈み込ませることで、透過性樹脂材本体１０１ａの下面と吸収性樹脂材１０２の上面が当接し、空間１０４はなくなる。したがって、突起１０１ｂが徐々に沈み込むことで、両樹脂材の接合面の間の空気は徐々に排出されるため、透過性樹脂材本体１０１ａの下面と吸収性樹脂材１０２の上面との間には空気が残っておらず、従来のように膨張した空気が破裂して、溶融した樹脂材が飛散することはなく、溶着状態を安定させることができる。
　また、突起１０１ｂが溶融された吸収性樹脂材１０２に沈み込むことによって、吸収性樹脂材１０２の溶融された樹脂材が、突起１０１ｂの表面に沿って吸収性樹脂材１０２の上面に流出する。それによって、透過性樹脂材本体１０１ａの下面と吸収性樹脂材１０２の上面との間に形成された溶着部１０５ａと、突起１０１ｂの表面と吸収性樹脂材１０２の斜面との間に形成された溶着部１０５ｂとで構成される溶着部１０５が形成される。そして、両樹脂材が互いに溶着される。
　すなわち、従来の吸収性樹脂材側に設けられてほとんど溶融してしまう突起と異なり、透過性樹脂材１０１側に設けられた突起１０１ｂは、部分的に溶融しながらも吸収性樹脂材１０２に沈み込む。
　したがって、従来のように両樹脂材の溶着面が平面に形成されている場合と比べて、突起１０１ｂの表面と吸収性樹脂材１０２の斜面との間に形成された溶着部１０５ｂが、溶着部１０５の一部を構成しているので、溶着面積が増加する。そして、溶着面積が増加することによって、溶着強度が向上する。
　上記のように、透過性樹脂材本体１０１ａの下面に突起１０１ｂを設けることによって、両樹脂材の接合面の間の空気が徐々に排出されることで溶着状態が安定し、突起１０１ｂの表面に溶着部１０５ｂが形成されることで溶着面積が増加して溶着強度が向上する。
　また、突起１０１ｂの先端の角度θを、θ＝４５°±１５°の範囲内とし、さらに透過性樹脂材本体１０１ａの下面から突起１０１ｂの下端までの高さＨ１を、Ｈ１＝５ｍｍ以下とすることで、上記効果を十分に確保することができる。
　また、透過性樹脂材本体１０１ａの下面に、複数の突起１０１ｂを設けることによって、溶着面積をさらに増加させることができ、溶着強度をさらに向上させることができる。
　（実施形態２）
　図２に第２の実施形態の樹脂材のレーザー溶着方法の概略構成図を示す。以下、図２に対する上下左右方向を基準とする。
　本実施形態は、実施形態１と同様の基本構成を有する樹脂材のレーザー溶着方法であるが、透過性樹脂材本体２０１ａの下面に設けられた突起２０１ｂの形状が異なる。本実施形態の透過性樹脂材２０１は、断面が略矩形状の透過性樹脂材本体２０１ａの下面に、断面が台形に形成された突起２０１ｂが設けられている。突起２０１ｂの左右の側面は、下方に向かうにつれて内側へ向かう斜面で形成され、突起２０１ｂの下面は、透過性樹脂材本体２０１ａの下面と平行に形成されている。
　実施形態１と同様に、突起２０１ｂの下面と吸収性樹脂材２０２の上面とが当接するように加圧力を加えた状態で、透過性樹脂材本体２０１ａの上面から突起２０１ｂを介して、吸収性樹脂材２０２の上面にレーザー光を照射することによって、突起２０１ｂは溶融された吸収性樹脂材２０２に沈み込む。
　そして、突起２０１ｂ全体が吸収性樹脂材２０２に沈み込むことによって、両樹脂材の接合面の間の空気が排出され、膨張した空気が破裂して溶融した樹脂材が飛散することはなく、溶着状態を安定させることができる。
　また、突起２０１ｂの断面形状を台形とすることで、断面形状が三角形の場合よりも表面積が大きいため、突起２０１ｂを吸収性樹脂材２０２に沈み込ませたとき、溶着面積が増加し、溶着強度をより向上させることができる。
　また、台形状の突起２０１ｂの上辺の左右方向の長さをＡ１、突起２０１ｂの下辺の左右方向の長さをＢ１とし、長さＡ１、Ｂ１の比を、Ａ１：Ｂ１＝１：１～１００：１の範囲内とすることで、上記効果を十分に確保することができる。
　（実施形態３）
　図３に第３の実施形態の樹脂材のレーザー溶着方法の概略構成図を示す。以下、図３に対する上下左右方向を基準とする。
　本実施形態は、実施形態１と同様の基本構成を有する樹脂材のレーザー溶着方法であるが、透過性樹脂材本体３０１ａの下面に設けられた突起３０１ｂの形状が異なる。本実施形態の透過性樹脂材３０１は、断面が略矩形状の透過性樹脂材本体３０１ａの下面に、断面が略台形に形成された突起３０１ｂが設けられている。突起３０１ｂの左右の側面は、下方に向かうにつれて内側へ向かう斜面で形成され、突起３０１ｂの下面は、透過性樹脂材本体３０１ａの下面と平行に形成されている。また、突起３０１ｂの側面と下面とを連続させる角部３０１ｃが曲率形状に形成されている。
　実施形態１と同様に、突起３０１ｂの下面と吸収性樹脂材３０２の上面とが当接するように加圧力を加えた状態で、透過性樹脂材本体３０１ａの上面から突起３０１ｂを介して、吸収性樹脂材３０２の上面にレーザー光を照射することによって、突起３０１ｂは溶融された吸収性樹脂材３０２に沈み込む。
　そして、突起３０１ｂ全体が吸収性樹脂材３０２に沈み込むことによって、両樹脂材の接合面の間の空気が排出され、膨張した空気が破裂して溶融した樹脂材が飛散することはなく、溶着状態を安定させることができる。
　また、突起３０１ｂの角部３０１ｃを曲率形状に形成することによって、角部３０１ｃにかかる応力を分散させることができるので、突起３０１ｂの強度を向上させることができる。
　また、突起３０１ｂの下面の角部の曲率Ｒを、Ｒ＝０．１～５０の範囲内とすることで、上記効果を十分に確保することができる。
　（実施形態４）
　上記のように、実施形態１～３で説明した樹脂材のレーザー溶着方法を用いて、例えば図４に示すようなケース４００におけるケース本体４０２と蓋４０１とを溶着することができる。以下、図４に対する上下左右方向を基準とする。
　本実施形態のケース４００は、吸収性樹脂材からなる上面が開口した略矩形箱状のケース本体４０２と、透過性樹脂材からなる板状の蓋４０１とで構成されており、ケース本体４０２の上部に蓋４０１が覆設されている。また、蓋４０１の下面は、実施形態１～３のいずれかの方法で示した突起（図示せず）が外周縁に沿って設けられ、突起はケース本体４０２の開口部周縁と当接する。
　そして、蓋４０１を下方に加圧した状態で、レーザー光４０３を蓋４０１の上面の外周縁から突起を介して、ケース本体４０２の開口部周縁に照射して走査することで、実施形態１～３と同様にケース本体４０２と蓋４０１の溶着状態を安定させ、溶着強度を向上させることができる。
　本発明を幾つかの好ましい実施形態について記述したが、この発明の本来の精神および範囲、即ち請求の範囲を逸脱することなく、当業者によって様々な修正および変形が可能である。

Claims (4)

  1. 　レーザー光を吸収する吸収性樹脂材と、レーザー光を透過させる透過性樹脂材とを重ね合わせて加圧し、その接合面に透過性樹脂材側からレーザー光を照射して走査することで、吸収性樹脂材を溶融させて、両樹脂材を溶着する樹脂材のレーザー溶着方法において、
    　透過性樹脂材の接合面に突起を設け、当該突起が吸収性樹脂材の接合面に当接するように加圧した状態で、レーザー光を照射して走査することを特徴とする樹脂材のレーザー溶着方法。
  2. 　前記突起の断面形状が、多角形であることを特徴とする請求項１記載の樹脂材のレーザー溶着方法。
  3. 　前記突起の先端は、少なくとも角部が曲率形状であることを特徴とする請求項１記載の樹脂材のレーザー溶着方法。
  4. 　前記突起は、複数の突起であることを特徴とする請求項１乃至３のいずれか１項に記載の樹脂材のレーザー溶着方法。
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