WO2013084758A1 - レーザ接合方法 - Google Patents
レーザ接合方法 Download PDFInfo
- Publication number
- WO2013084758A1 WO2013084758A1 PCT/JP2012/080667 JP2012080667W WO2013084758A1 WO 2013084758 A1 WO2013084758 A1 WO 2013084758A1 JP 2012080667 W JP2012080667 W JP 2012080667W WO 2013084758 A1 WO2013084758 A1 WO 2013084758A1
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- Prior art keywords
- laser
- translucent resin
- resin
- translucent
- thru
- Prior art date
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- 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
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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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General 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
- B29C66/812—General 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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
- B29C66/8126—General 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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
- B29C66/81266—Optical properties, e.g. transparency, reflectivity
- B29C66/81267—Transparent to electromagnetic radiation, e.g. to visible light
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/30—Organic material
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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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
- B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
- B29C2035/0827—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using UV radiation
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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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
- B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
- B29C2035/0838—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using laser
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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
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/10—Surface shaping of articles, e.g. embossing; Apparatus therefor by electric discharge treatment
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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
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/14—Surface shaping of articles, e.g. embossing; Apparatus therefor by plasma treatment
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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
- B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
- B29C65/1609—Visible light radiation, e.g. by visible light lasers
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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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/001—Joining in special atmospheres
- B29C66/0012—Joining in special atmospheres characterised by the type of environment
- B29C66/0016—Liquid environments, i.e. the parts to be joined being submerged in a liquid
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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
- 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
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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
- 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
- B29C66/712—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 the composition of one of the parts to be joined being different from the composition of the other part
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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
- 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
- B29C66/731—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 intensive physical properties of the material of the parts to be joined
- B29C66/7311—Thermal properties
- B29C66/73117—Tg, i.e. glass transition temperature
- B29C66/73118—Tg, i.e. glass transition temperature of different glass transition temperature, i.e. the glass transition temperature of one of the parts to be joined being different from the glass transition temperature of the other part
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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
- 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
- B29C66/737—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 state of the material of the parts to be joined
- B29C66/7377—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 state of the material of the parts to be joined amorphous, semi-crystalline or crystalline
- B29C66/73771—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 state of the material of the parts to be joined amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being amorphous
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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
- 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
- B29C66/737—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 state of the material of the parts to be joined
- B29C66/7377—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 state of the material of the parts to be joined amorphous, semi-crystalline or crystalline
- B29C66/73771—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 state of the material of the parts to be joined amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being amorphous
- B29C66/73772—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 state of the material of the parts to be joined amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being amorphous the to-be-joined areas of both parts to be joined being amorphous
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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
- 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
- B29C66/737—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 state of the material of the parts to be joined
- B29C66/7377—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 state of the material of the parts to be joined amorphous, semi-crystalline or crystalline
- B29C66/73775—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 state of the material of the parts to be joined amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being crystalline
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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
- 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
- B29C66/737—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 state of the material of the parts to be joined
- B29C66/7377—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 state of the material of the parts to be joined amorphous, semi-crystalline or crystalline
- B29C66/73775—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 state of the material of the parts to be joined amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being crystalline
- B29C66/73776—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 state of the material of the parts to be joined amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being crystalline the to-be-joined areas of both parts to be joined being crystalline
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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
- 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
- B29C66/7394—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 thermoset
- B29C66/73941—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 thermoset characterised by the materials of both parts being thermosets
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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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/95—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94
- B29C66/959—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 characterised by specific values or ranges of said specific variables
- B29C66/9592—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 characterised by specific values or ranges of said specific variables in explicit relation to another variable, e.g. X-Y diagrams
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- 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
- B29K2025/00—Use of polymers of vinyl-aromatic compounds or derivatives thereof as moulding material
- B29K2025/04—Polymers of styrene
- B29K2025/06—PS, i.e. polystyrene
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- 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
- B29K2045/00—Use of polymers of unsaturated cyclic compounds having no unsaturated aliphatic groups in a side-chain, e.g. coumarone-indene resins or derivatives thereof, as moulding material
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- 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
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
- B29K2995/0026—Transparent
- B29K2995/0027—Transparent for light outside the visible spectrum
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- 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
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
- B29K2995/0029—Translucent
-
- 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
- B29L2011/00—Optical elements, e.g. lenses, prisms
-
- 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
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0016—Lenses
-
- 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
- B29L2031/756—Microarticles, nanoarticles
Definitions
- the present invention relates to a laser bonding method characterized by welding a light-transmitting organic material (such as a thermoplastic resin or a thermosetting resin) or a light-transmitting organic material and an inorganic material.
- a light-transmitting organic material such as a thermoplastic resin or a thermosetting resin
- thermoplastic resins are widely used in general industrial applications such as automobiles, electrical equipment, medical and biotechnology equipment because of their excellent processability and large degree of freedom in shape. There is no field where thermoplastic resins are not used. It is so popular that it is a familiar material. Originally used as a substitute for natural materials such as wood and paper, many special products that can only be made using plastic materials have now been developed. Therefore, if the best materials are used in design development with the best processing methods, there is a possibility that new products will be created.
- Patent Document 1 As laser welding of transparent resins, in Patent Document 1, laser irradiation is performed with a transparent film having the same component as that of a transparent resin that is very thin and absorbable with respect to laser light interposed between transparent resin members. Describes that welding is possible. Patent Document 2 describes that welding can be performed by irradiating a laser by irradiating a transparent resin member on one side with toner or paint in a predetermined pattern. Patent Document 3 shows that the transparent resin can be welded by roughening one side of the joint portion of the transparent resin with sandpaper to form an uneven surface and irradiating the portion with laser.
- Patent Document 1 an infrared absorbing transparent film is used.
- the absorption rate is as low as 5 to 8% and the thickness of the film exists, stable heat conduction does not occur and stable welding is performed. Proved difficult.
- a solid film is interposed, workability is poor, there is a problem that a bonding state is not stable because a part of the film is bent and a gap is generated.
- the object of the present invention is to solve the above-mentioned problems and to perform laser welding of a transparent resin stably and with high strength while maintaining a transparent state.
- the inventors Prior to laser irradiation, the inventors perform photo-oxidation treatment (UV ozone treatment, excimer treatment, etc.) using ultraviolet light at least on the welding interface side of the transparent resin opposite to the material that transmits the laser, and pressurize.
- photo-oxidation treatment UV ozone treatment, excimer treatment, etc.
- ultraviolet light at least on the welding interface side of the transparent resin opposite to the material that transmits the laser, and pressurize.
- a continuous wave or pulsed ultraviolet laser beam having a wavelength of 400 nm or less, or an ultrashort pulse laser beam having a pulse width of 10 ps or less while maintaining transparency. It has been found that high strength welding is possible. It has also been clarified that the present invention can be applied not only to the same type but also to different types of resins.
- the transparent resin is subjected to photo-oxidation treatment, the laser transmittance is lowered while maintaining the visible light transmittance, and the members to be joined are laser-joined to the resin. .
- thermoplastic resins it is possible to stably and strongly laser weld transparent thermoplastic resins while maintaining a transparent state. Moreover, since it is possible to improve the adhesiveness of the interface of a junction part simultaneously, the combination of dissimilar materials is also attained.
- the transparent thermoplastic resin used in the present invention is made of an amorphous or crystalline resin, and in particular, a transparent resin having a transmittance of 70% or more at a wavelength of 400 nm or more is targeted.
- Non-crystalline resins include polystyrene (PS), polycarbonate (PC), polyarylate (PAR), polymethyl methyl methacrylate (PMMA), cycloolefin polymer (COP), cycloolefin copolymer (COC), and polysulfone (PSF).
- PS polystyrene
- PC polycarbonate
- PAR polyarylate
- PMMA polymethyl methyl methacrylate
- COP cycloolefin polymer
- COC cycloolefin copolymer
- PSF polysulfone
- PES polyethersulfone
- the crystalline resin examples include polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polyamide (PA), and the like.
- PET polyethylene terephthalate
- PA polyamide
- transparent thermoplastic resins containing such alloy materials and fillers, and special grade transparent thermoplastic resins are also targeted.
- As the form of the resin not only general molded products but also films are targeted.
- thermoplasticity but also thermosetting resin may be used.
- a transparent resin is used.
- the present invention is not limited to this, and the resin may have a slight color such as translucent as long as it has translucency. Even if it is translucent, according to the present invention, since the visible light transmittance is not changed, the color does not change, and the effects of the present invention can be achieved.
- the laser welding conditions determine the laser spot size, power, irradiation time, and applied pressure in consideration of the transmission / absorption rate and thermal conductivity of the material at the laser irradiation wavelength.
- the light source used for laser bonding is targeted for a laser having a wavelength in the ultraviolet region.
- a semiconductor laser, an excimer laser, an Nd: YAG laser, an Nd: YVO4 laser, or the like that can oscillate and emit high-order harmonics is also possible. Even if the laser alone does not generate ultraviolet light, nonlinear absorption occurs in the thermoplastic resin when laser light having a pulse width shorter than 10 picoseconds is incident. Therefore, Ti: Sahire laser is also a target.
- the intensity distribution of the laser light source can be changed to various intensity distributions depending on the attached lens such as Gaussian, top hat, and ring type. It is desirable to use a light source using a ring-type intensity distribution in which is 50% or more of the maximum value.
- a transparent material is preferably used as the pressurizing material used for pressurization.
- the pressurizing material used for pressurization.
- the surface of the pressure member has a mirror finish.
- FIG. 1 is a plan view showing an embodiment of a laser joining method between transparent resins of the present invention.
- the first transparent thermoplastic resin 2 through which the laser beam 20 is transmitted and the second transparent thermoplastic resin 1 that is the same as or different from the first transparent thermoplastic resin 2 are used.
- the bonding interface side of the second transparent thermoplastic resin 1 is subjected to a photo-oxidation treatment and is pressurized and irradiated with laser light 20 in the ultraviolet region having a wavelength of 400 nm or less or laser light 20 having a pulse width of 10 ps or less. It is characterized by welding.
- the photo-oxidation treatment it is desirable to use treatment using ultraviolet light such as UV ozone treatment or excimer UV treatment.
- ultraviolet light such as UV ozone treatment or excimer UV treatment.
- the light source for the oxidation treatment may be in the form of a lamp, LED, or laser. If the photo-oxidized layer 3 is too thick, it causes a decrease in strength, so that it is desirable that the thickness is 50 nm or less. Further, in the case of laser welding, only the portion irradiated with the laser beam 20 can be locally bonded, but the photo-oxidation treatment is performed locally, and the spot is more than the locally photo-oxidized portion.
- FIG. 2 shows the results of light transmittance when UV ozone treatment is performed on cycloolefin polymer (COP).
- COP cycloolefin polymer
- (a) shows the transmittance at wavelengths of 305 nm to 1090 nm
- (b) shows the transmittance at wavelengths of 305 to 410 nm, which is an enlarged view of FIG.
- oxidation treatment a case where oxygen plasma treatment is performed is also shown.
- the UV ozone treatment makes it possible to greatly improve the light absorption rate only in the ultraviolet region without greatly changing the characteristics of light in the visible region or infrared region of the transparent resin. Therefore, depending on the type of resin material, the photo-oxidation treatment is not performed locally, and transparency can be ensured even if laser welding is performed in a state where the entire surface treatment is performed. That is, even after the photo-oxidation treatment, the transparent resin has a transmittance of 70% or more in visible light, and even in the case of the translucent resin, it has a transmittance of 70% or more compared to that before the photo-oxidation treatment.
- the incident laser 20 is effectively a laser beam in the ultraviolet region, and corresponds to a higher harmonic of a laser light source such as an ultraviolet semiconductor laser, an infrared semiconductor laser, or a solid-state laser. In that case, a continuous wave or a pulse may be used.
- a laser beam having a pulse width of 10 ps or less is irradiated, multiphoton absorption is likely to occur due to the third-order nonlinear optical effect. Therefore, when using a laser beam having a pulse width of 10 ps or less, the wavelength of the laser 20 may not be in the ultraviolet region.
- Laser welding occurs when the second transparent thermoplastic resin 1 with improved light absorption is melted or softened by laser irradiation and is in close contact with or wets the first transparent thermoplastic resin 2.
- the photo-oxidation treatment is performed as a pretreatment, polar groups are increased or newly generated on the surface of the transparent thermoplastic resin, and the surface energy is improved accordingly. Therefore, when different types of transparent thermoplastic resins are bonded, even if the second transparent resin 1 is subjected to a photo-oxidation treatment in order to improve light absorption, the surface energy of the first transparent thermoplastic resin 2 ⁇ It is necessary to use the surface energy of the second transparent thermoplastic resin 1.
- the transparent thermoplastic resins of the same type have compatibility, if the laser power is increased, the transparent thermoplastic resin 1 will flow and mix with each other. Even if it is reversed, the weldability is not greatly adversely affected.
- the glass transition temperature or melting point of the second transparent thermoplastic resin 1 is equal to or higher than the glass transition temperature or melting point of the first transparent thermoplastic resin 2.
- the glass transition temperature and the melting point clearly exist.
- laser welding it is desirable to satisfy the above relationship in consideration of the glass transition temperature of an amorphous resin and the melting point of a crystalline resin.
- the transparent resins are joined together.
- the second transparent resin to be subjected to the photo-oxidation treatment must be a resin, but instead of the first transparent resin, a member of another material having translucency such as glass, semiconductor, ore may be used.
- laser irradiation is performed from the first transparent thermoplastic resin 2 side, but laser irradiation may be performed from the second thermoplastic resin 1 side. This is because only the thin region near the surface is subjected to the photo-oxidation treatment, so even if laser irradiation is performed from the second transparent thermoplastic 1 side, it is sufficiently absorbed in the vicinity of the joint surface.
- FIG. 6 is a plan view showing another embodiment of the laser joining method between transparent resins of the present invention.
- the first transparent thermoplastic resin 2 through which the laser beam is transmitted is also oxidized to form an oxide layer 4, and then laser It is characterized by welding.
- the thermoplastic resin has a lot of sink marks during molding. Therefore, when the gap is somewhat enlarged due to the sink marks, the thermoplastic resin is hardly adhered and may become poorly welded. In that case, the first transparent thermoplastic resin 2 is also subjected to a photo-oxidation treatment, and the light absorption rate is improved to some extent, so that the first thermoplastic resin 2 is also expanded by heat absorption.
- the second thermoplastic resin 1 can be easily adhered.
- This method is an effective means for both the same type of transparent thermoplastic resin and different types of transparent thermoplastic resin, but the light absorption rate of the second transparent thermoplastic resin 1> the light absorption rate of the first transparent thermoplastic resin 2. Is desirable. However, when different types of transparent thermoplastic resins are to be welded, the surface energy of the first transparent thermoplastic resin 2 needs to be equal to or greater than the surface energy of the second transparent thermoplastic resin 1, and therefore the light absorption rate is also taken into consideration. Therefore, it is necessary to determine the processing time and strength. However, depending on the combination of the transparent thermoplastic resins to be joined, when priority is given to improving the light absorption rate of the second transparent thermoplastic resin 1, the surface energy of the second transparent thermoplastic resin 1 becomes too large.
- the oxidation treatment to the first transparent thermoplastic resin 1 does not change the light absorptivity other than the photo-oxidation treatment, and the wavelength other than the plasma treatment, corona treatment, and ultraviolet that can improve the surface energy. It is desirable to carry out the laser treatment used. By doing so, the surface energy of the first transparent thermoplastic resin 2 is greater than or equal to that of the first transparent thermoplastic resin 2 by greatly increasing the light absorption rate in the ultraviolet region of the second transparent thermoplastic resin 1 in many combinations. The surface energy of the second transparent thermoplastic resin 1 can be set. In the case of this combination, the first transparent thermoplastic resin is a resin on the side through which laser light is transmitted.
- FIG. 7 is a plan view showing another embodiment of the laser joining method between transparent resins of the present invention.
- fine irregularities 5 are formed, It is characterized by laser welding to each other. By doing in this way, it becomes possible to further improve the light absorption rate of the 2nd transparent thermoplastic resin 1.
- FIG. The fine irregularities 5 can be formed by transferring a textured die, sandblasting, sandpaper treatment, laser treatment, and chemical treatment, and then photo-oxidation treatment is desirable.
- both the photo-oxidation treatment 3 and the fine irregularities 5 can be formed only by the ultraviolet laser treatment.
- it is desirable that the fine unevenness is Ra 5 ⁇ m or less.
- FIG. 9 is a plan view showing another embodiment of the laser joining method between transparent resins of the present invention.
- a state where the second transparent thermoplastic resin 1 is subjected to photo-oxidation treatment on the bonding interface side and then the liquid intermediate material 7 is interposed.
- it is characterized by pressurizing and laser welding.
- air exists in the gap portion. Since the thermal conductivity of air is very small, for example, 0.032 W / mK at 100 ° C., the first transparent thermoplastic resin 2 is caused by the thermal expansion of the second thermoplastic resin 1 having light absorption at the time of laser irradiation.
- the thermal conductivity of water is 0.67 W / mK at 80 ° C., which is about 20 times larger than that of air.
- the intermediate material 7 is desirably made of a liquid material having a viscosity of 1000 mPa ⁇ s or less and a thermal conductivity of at least 0.2 W / mK, and has low flammability such as alcohol as well as pure water. Materials that volatilize upon laser irradiation, such as solvents, primers, and adhesives, are suitable. Further, by using the intermediate material 7, it is possible to reduce the influence of reflection at the interface of the joint surface of the first transparent thermoplastic resin 2, and it is possible to weld more effectively.
- the inclusion of the intermediate material 7 is a robust method that can reduce the rate of reduction of the welding strength when gaps occur, and further when the methods in Examples 2 and 3 shown so far are used in combination. It becomes an effective means.
- the intermediate material 7 is used in advance so as to be in close contact with each other, it is also an advantage that no displacement occurs during pressurization. In that case, it may be advantageous depending on the process in that it can be positioned in advance before pressurization.
- the present invention as a form of the thermoplastic resin material. This method is particularly effective when it is difficult to ensure close contact with pressure, such as when a film with low rigidity is used.
- FIG. 10 is a plan view showing another embodiment of the laser joining method between transparent resins of the present invention, which is a laser joining method for forming a three-layer transparent thermoplastic resin joined body.
- the first transparent resin is brought into close contact with the photo-oxidized second transparent resin (FIG. 10 (a)), and then irradiated with an ultraviolet laser beam (FIG. 10 (b)).
- Photo-oxidation treatment is performed on the surface opposite to the surface to which the transparent resin is bonded (FIG. 10C)
- a third transparent resin is brought into close contact therewith (FIG. 10D)
- laser irradiation is performed (FIG. 10).
- E) Three transparent resins are joined.
- an ultrashort pulse is used for the laser light source.
- the first transparent resin is brought into close contact with the second transparent resin photooxidized on both sides (FIG. 11 (a)), and then irradiated with an ultrashort pulse laser (FIG. 11 (b)).
- the third transparent resin is brought into close contact with the surface opposite to the surface to which the transparent resin is bonded (FIG. 11C), and the three transparent resins are bonded by laser irradiation (FIG. 11D). Therefore, there is a merit in that nonlinear absorption can be caused and a joined body can be formed by focusing only on the joined portion subjected to the photo-oxidation treatment in a state where the three layers are pressurized. For this reason, the resin only needs to be subjected to photo-oxidation treatment in a lump, and there is a great merit in that the process can be omitted.
- these methods are not limited to three layers, and more layers can be stacked.
- FIG. 12 is a perspective view showing an example when the periphery of the flow path portion 41 of the DNA sequencer flow cell 40 is sealed using the laser bonding method of the present invention.
- the laser bonding method of the present invention since joining of transparent bodies is desired and outgas and foreign substances are desired to be removed as much as possible, it is the most effective target for applying this method.
- products that use laser light such as optical pickups, camera modules, and microprojectors, use a plurality of lenses, and can be used for direct joining of the plurality of lenses. This method is effective not only for the product examples described above but also for all products as long as it is an object to join transparent materials.
- Example 1-6 may be not only a transparent thermoplastic resin but also a transparent thermosetting resin.
- inorganic substances such as glass, semiconductor, ore are also included in the target range.
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Abstract
透明な状態を保持した上で、透明な樹脂同士を、安定かつ高強度にレーザ溶着する方法を提供する。 レーザ溶着前に、少なくとも第二の透明樹脂の接合面側に、光酸化処理を施すことで、可視光の透過率を低下させずに、レーザの透過率を低下させる。この第二の透明樹脂を加圧した状態で、波長400nm以下の紫外領域のレーザ光もしくはパルス幅10ps以下のレーザ光を照射し、レーザ溶着する。
Description
本発明は、透光性の有機材料(熱可塑性樹脂、熱硬化性樹脂など)もしくは透光性の有機材料と無機材料を溶着することを特徴とするレーザ接合方法に関するものである。
熱可塑性樹脂は、優れた加工性と形状の自由度が大きいため、自動車や電機機器や医療・バイオ機器など一般産業用途に広く用いられており、熱可塑性樹脂が使われていない分野はないと言えるほど普及し、身近な材料となっている。当初は、木材や紙などの天然素材の代替として利用されていたが、今やプラスチック材料でなければつくり得ないという特殊な製品も数多く開発されるようになった。そのため、最適な材料を最適な加工方法で設計開発に生かせば、今までにない新しい製品を生み出す可能性がある。
特に、近年の製品の構造の複雑化及び低コスト化の流れにより、熱可塑性樹脂のメリットを生かした設計がなされ、2次加工技術も同様に重要となってきている。その中でも、近年、半導体レーザの普及により、レーザ溶着が注目されている。レーザ溶着は、樹脂のバリの発生が少ない非常にクリーンな接合技術であるため,バイオや医療関係の部品を対象としても研究が盛んに行われている。レーザ溶着の特長は,対象部のレーザ光照射部周辺のみを集中的に急速に加熱するので,精度が高くかつ歪が小さいこと,また,レーザを走査することにより,複雑な三次元形状物や大型品の溶着・接合が可能なこと,工数や部品数の削減による低コスト化を図ることができるなどである。しかしながら、一般的には透明な樹脂と黒色の樹脂を使用するため、透明樹脂同士の溶着は困難である。
透明樹脂同士のレーザ溶着として、特許文献1には透明樹脂部材間にレーザ光に対して吸収性で非常に薄い透明樹脂と同様の成分を持つ透明フィルムを介在させた状態で、レーザ照射することにより、溶着可能なことが記載されている。特許文献2には、透明樹脂部材の片側にトナーや塗料を所定のパターンで被着させることによって、レーザ照射することにより、溶着可能なことが記載されている。特許文献3では、透明樹脂の接合部の片側をサンドペーパーで荒らして凹凸面を形成し、その部分にレーザ照射することにより、透明樹脂同士も溶着できることが示されている。
上記特許文献1で開示されている技術では、赤外線吸収透明フィルムを用いるが、吸収率が5~8%と低く、フィルムの厚みが存在するため、安定的な熱伝導が起こらず、安定な溶着が困難であることが判明した。また、固体のフィルムを介在させるため、作業性が悪く、配置した時に一部撓んでしまい、隙間が発生することにより、接合状態が安定しないという課題もあった。
上記特許文献2で開示されている技術では、トナーや塗料を表面に蒸着させた状態でレーザ照射することが述べられているが、トナーや塗料の透明樹脂への密着性が低いために、例えば透明樹脂に同種材料を用いたとしても強度が弱いことが多々あった。さらに、転写した材質や固体の中間材の厚みや平坦度に依存して、接合状態が大きくばらつくため、接合前の管理が難しく、改善が切望されていた。
上記特許文献3で開示されている技術では、表面への微細な凹凸にレーザ吸収させることで、溶着を可能としているが、表面の凹凸の程度により吸収率が大きく異なるため、この効果のみでは安定的な溶着を得ることが困難であった。さらに、吸収率にばらつきが発生するため、精密なサイズで溶着部を形成することが困難なことも判明した。
本発明は、上記課題を解決し、透明樹脂を、透明な状態を保持した上で、安定かつ高強度にレーザ溶着することを目的とする。
本発明者らは、レーザ照射前に、少なくともレーザを透過する材質と反対側の透明樹脂の溶着界面側に紫外光を用いた光酸化処理(UVオゾン処理、エキシマ処理など)を行い、加圧した状態で、波長400nm以下の連続波もしくはパルスの紫外レーザ光、または、パルス幅10ps以下の超短パルスのレーザ光を照射することで、透明性を維持した上で、透明樹脂同士の安定かつ高強度な溶着が可能なことを見出した。また、本発明では、同種のみならず、異種樹脂にも対応可能であることも明らかになった。
本発明では、上記課題を解決するために、透明樹脂に光酸化処理を行って、可視光の透過率を維持したままレーザ透過率を低下させ、この樹脂に接合対象の部材をレーザ接合を行う。
本発明によれば、透明な状態を保持した上で、透明な熱可塑性樹脂同士を、安定かつ高強度にレーザ溶着することが可能となる。また、同時に接合部の界面の密着性を向上させることが可能であるため、異種材料同士の組み合わせも可能となる。
本発明の実施の形態について以下に説明する。本発明で用いる透明熱可塑性樹脂は、非結晶性もしくは結晶性樹脂からなり、特に、波長400nm以上での透過率が70%以上の透明樹脂を対象とする。非結晶性樹脂としては、ポリスチレン(PS)、ポリカーボネート(PC)、ポリアリレート(PAR)、ポリメチルメタアクリル酸メチル(PMMA)、シクロオレフィンポリマー(COP)、シクロオレフィンコポリマー(COC)、ポリサルホン(PSF)、ポリエーテルサルホン(PES)、が挙げられる。結晶性樹脂としては、ポリエチレン(PE)、ポリプロプレン(PP)、ポリエチレンテレフタレート(PET)、ポリアミド(PA)などが挙げられる。また、それらのアロイ材やフィラーを含んだ透明な熱可塑性樹脂、また、特殊グレードの透明熱可塑性樹脂も対象となる。樹脂の形態としては、一般的な成形品のみならず、フィルムも対象となる。さらに、樹脂は熱可塑性のみならず熱硬化樹脂を用いても良い。
また、実施例内では透明な樹脂を用いているが、これに限らず、透光性を有していれば、半透明など少し色を有していてもよい。半透明でも、本発明によれば可視光の透過率を変化させないためその色が変化せず、本発明の効果を奏することができるからである。
レーザ溶着の条件は、材料のレーザ照射波長における透過・吸収率、熱伝導率を考慮した上で、レーザスポットサイズ、パワー、照射時間、加圧力を決定する。レーザ接合に用いる光源は、紫外流域の波長を有するレーザが対象となる。その場合、半導体レーザ、エキシマレーザ、また、パルス発振し、高次高調波を出射可能なNd:YAGレーザ、Nd:YVO4レーザなども可能である。また、レーザ単体で紫外光を発生しなくても、10ピコ秒よりもパルス幅が短いレーザ光を入射した場合、熱可塑性樹脂には非線形な吸収が起こる。そのため、Ti:Sahhireレーザなども対象となる。
レーザ光源の強度分布は、ガウシアン、トップハット、リング型など付属するレンズによって様々な強度分布にすることが可能であるが、溶着状態を均一にしやすいという点で、トップハット型もしくは中央部の強度が最大値の50%以上となるリング型の強度分布を用いた光源を使用することが望ましい。
また、溶着前の段階で透明熱可塑性樹脂には、一度アルコールなどで脱脂しておくと良い。なお、透明熱可塑性樹脂に酸化処理を実施する場合は、酸化処理の前に脱脂をする必要がある。
レーザ溶着では、加圧を行う必要があるため、加圧に用いる加圧材は、透明な材料を用いるのが良い。但し、レーザ照射側の材質の十分な放熱を考慮すると、特に熱伝導率が高いガラスを用いることが望ましい。さらに、加圧材の表面は鏡面仕上げにしておくことが望ましい。
図1は、本発明の透明樹脂同士のレーザ接合方法の実施例を示す平面図である。本実施例では、レーザ光20が透過する第一の透明熱可塑性樹脂2と、第一の透明熱可塑性樹脂2と同一もしくは異なる第二の透明熱可塑性樹脂1からなり、レーザ溶着前に、少なくとも第二の透明熱可塑性樹脂1の接合界面側に、光酸化処理を施し、加圧した状態で、波長400nm以下の紫外領域のレーザ光20もしくはパルス幅10ps以下のレーザ光20を照射し、レーザ溶着することを特徴とする。
光酸化処理としては、UVオゾン処理やエキシマUV処理などの紫外光を用いた処理を利用することが望ましい。その処理によって、光酸化層3が新たに形成され、波長400nm以下の光の吸収率が劇的に向上する。酸化処理向けの光源としてはランプ、LED、レーザどの形態でも構わない。なお、光酸化層3は厚すぎると強度低下の要因となるため、50nm以下であることが望ましい。また、レーザ溶着の場合、レーザ光20が照射された部分のみ局所的に接合が可能となるが、光酸化処理を局所的に実施しておき、その局所的に光酸化処理した部分よりもスポットの大きいレーザを照射すれば、多少レーザ光源の位置がずれたとしても溶着したい部分のみ精密に接合が可能となる。そのため、場合によっては、マスクなどをかけた上で局所的に光酸化処理を実施することが望ましい。
図2には、シクロオレフィンポリマー(COP)にUVオゾン処理を実施した場合の光透過率の結果を示している。特に、(a)には波長305nm-1090nmの透過率を、(b)には、図2(a)を拡大した波長305-410nmの透過率を示す。また、酸化処理の他の方法として、酸素プラズマ処理を実施した場合についても示す。
この結果、UVオゾン処理を実施することにより、可視域や赤外域での光の透過率つまり吸収率はそれほど変わらないのに対して、紫外域での光の吸収率が大幅に向上していることがわかる。さらに、UVオゾン処理時間の増加により、紫外域での光の吸収率がより向上することもわかった。また、他の酸化処理である酸素プラズマ処理では、透過率つまり吸収率は変化していないこともわかる。図3には、シクロオレフィンコポリマー(COC)、図4には、ポリカーボネート(PC)、図5には、ポリスチレン(PS)に対する同様の結果を示す。これらの結果からもシクロオレフィンポリマーと同様の傾向を示していることが明らかになった。さらに、305nm以下の光吸収率も向上していることもわかっている。したがって、UVオゾン処理により、透明樹脂の可視域や赤外域での光の特性を大きく変化させないで、紫外域のみの光の吸収率を大きく向上させることが可能となる。そのため、樹脂材の種類によっては、光酸化処理は局所的に実施せず、全面処理を実施した状態で、レーザ溶着しても透明性は確保できる。すなわち、光酸化処理後でも、透明樹脂に場合には可視光において70%以上の透過率を有し、半透明樹脂の場合でも光酸化処理前に対して70%以上の透過率を有する。
入射するレーザ20は、紫外領域のレーザ光が有効であり、紫外半導体レーザ、赤外の半導体レーザもしくは固体レーザなどのレーザ光源の高次高調波が該当する。その場合、連続波でも良いし、パルスでも構わない。また、パルス幅10ps以下のレーザ光を照射すると、三次の非線形光学効果により、多光子吸収が発生しやすくなる。そのため、パルス幅10ps以下のレーザ光を用いる場合は、レーザ20の波長は紫外領域でなくても良い。
レーザ溶着は、レーザ照射により、光吸収性が向上した第二の透明熱可塑性樹脂1が溶融もしくは軟化し、第一の透明熱可塑性樹脂2に密着もしくは濡れることで起こる。前処理として光酸化処理をすると透明熱可塑性樹脂表面に極性基が増加もしく新たに発生し、それに伴い表面エネルギーは向上する。そのため、異種の透明熱可塑性樹脂を接合する場合は、光吸収性を向上させるために第二の透明樹脂1に光酸化処理を実施したとしても、第一の透明熱可塑性樹脂2の表面エネルギー≧第二の透明熱可塑性樹脂1の表面エネルギーとする必要がある。
但し、同種の透明熱可塑性樹脂同士においては、相溶性を有しているため、レーザのパワーを大きくすれば、透明熱可塑性樹脂1は流動し、互いに混ざり合いが起こるため、例え、そのエネルギー関係が逆転したとしても溶着性には大きな悪影響は及ぼさない。
さらに、異種の透明熱可塑性樹脂を溶着する場合、第二の透明熱可塑性樹脂1のガラス転移温度もしくは融点≧第一の透明熱可塑性樹脂2のガラス転移温度もしくは融点とした組み合わせとしておくことが望ましい。一般的に、非結晶性樹脂の場合にはガラス転移温度のみ存在し、明確な融点は示さないのに対して、結晶性樹脂の場合は、ガラス転移温度と融点が明確に存在する。レーザ溶着においては、非結晶性樹脂はガラス転移温度を、結晶性樹脂の場合は、融点を考慮して、上記関係を満たすことが望ましい。
また、本実施例では、透明樹脂同士を接合している。光酸化処理を行う第二の透明樹脂は樹脂でなければならないが、第一の透明樹脂の代わりにガラス、半導体、鉱石など透光性を有する他の材料の部材を用いてもよい。
なお、本実施例では、第一の透明熱可塑性樹脂2側からレーザ照射を行っているが、第二の熱可塑性樹脂1側からレーザ照射を行ってもよい。光酸化処理されるのは表面近くの薄い領域のみであるので、第二の透明熱可塑性1側からレーザ照射しても、十分に接合面付近で吸収されるからである。
図6は、本発明の透明樹脂同士のレーザ接合方法の別の実施例を示す平面図である。本実施例では、実施例1の実施形態に加え、レーザ溶着前に、レーザ光が透過する第一の透明熱可塑性樹脂2にも酸化処理を実施し、酸化層4を形成した上で、レーザ溶着することを特徴としている。熱可塑性樹脂は、成形時に少なからずヒケが発生するため、ヒケにより、多少隙間が大きくなってしまった場合、密着しにくくなり、溶着不良となる場合がある。その場合、第一の透明熱可塑性樹脂2に対しても、光酸化処理を実施しておき、光吸収率をある程度まで向上させておくことで第一の熱可塑性樹脂2も熱吸収により膨張させ、第二の熱可塑性樹脂1と密着させやすくすることが可能となる。
本手法は、同種の透明熱可塑性樹脂及び異種の透明熱可塑性樹脂ともに有効な手段であるが、第二の透明熱可塑性樹脂1の光吸収率>第一の透明熱可塑性樹脂2の光吸収率とすることが望ましい。但し、異種の透明熱可塑性樹脂を溶着する場合は、第一の透明熱可塑性樹脂2の表面エネルギー≧第二の透明な熱可塑性樹脂1の表面エネルギーとする必要があるため、光吸収率も踏まえて、処理時間や強度を決める必要がある。しかしながら、接合する透明熱可塑性樹脂の組み合わせによっては、第二の透明熱可塑性樹脂1の光吸収率の向上を優先した場合、第二の透明熱可塑性樹脂1の表面エネルギーの方が大きくなりすぎてしまい、溶着状態が悪くなってしまう場合がある。その場合、第一の透明熱可塑性樹脂1への酸化処理は、光酸化処理以外の光吸収率が変化せず、表面エネルギーを向上させることが可能なプラズマ処理、コロナ処理、紫外以外の波長を使用するレーザ処理を実施することが望ましい。そのようにすることで、多くの組み合わせで、第二の透明熱可塑性樹脂1の紫外領域での光吸収率を大幅に増大させた上で、第一の透明熱可塑性樹脂2の表面エネルギー≧第二の透明熱可塑性樹脂1の表面エネルギーとすることが可能となる。なお、本組合せの場合、第一の透明熱可塑性樹脂はレーザ光が透過する側の樹脂である。
図7は、本発明の透明樹脂同士のレーザ接合方法の別の実施例を示す平面図である。本実施例では、実施例1の形態に加え、レーザ溶着前に、第二の透明熱可塑性樹脂1の接合界面側に光酸化処理を施した上で、微細な凹凸5を形成しておき、互いにレーザ溶着することを特徴としている。このようにすることにより、第二の透明熱可塑性樹脂1の光吸収率をさらに向上させることが可能となる。微細な凹凸5は、シボ加工を施した金型の転写を利用、サンドブラスト、サンドペーパー処理、レーザ処理、薬液処理を実施することで形成が可能であり、その後、光酸化処理することが望ましい。但し、透明熱可塑性樹脂の種類によっては、紫外レーザ処理のみで、光酸化処理3と微細な凹凸5を共に形成できる。なお、微細な凹凸はRa5μm以下とすることが望ましい。
また、図8で示すように、第一の透明熱可塑性樹脂2の溶着界面側にも微細な凹凸6を形成しておくことも熱膨張時に密着させやすくする点で有効となる。以上示した微細な凹凸5,6の形成に加え、第一の透明熱可塑性樹脂2への酸化処理の併用も非常に有効な手段となる。但し、微細な凹凸5,6と酸化処理の併用を行ったとしても、第二の透明熱可塑性樹脂1の光吸収率>第一の透明熱可塑性樹脂2の光吸収率とすることが望ましい。
図9は、本発明の透明樹脂同士のレーザ接合方法の別の実施例を示す平面図である。本実施例では、実施例1の実施形態に加え、レーザ溶着前に、第二の透明熱可塑性樹脂1の接合界面側に光酸化処理を施した上で、液状の中間材7を介した状態で、加圧し、レーザ溶着することを特徴としている。成形時のひけなどにより隙間が発生してしまう場合、隙間部分は空気が存在する。空気の熱伝導率は例えば100℃で0.032W/mKと非常に小さいため、レーザ照射時に、光吸収性を持つ第二の熱可塑性樹脂1の熱膨張によって、第一の透明熱可塑性樹脂2への接触が起こらない場合、第一の透明熱可塑性樹脂2への十分な熱伝導が起こらず、光吸収性を持つ第二の熱可塑性樹脂1は、異常な発熱により熱分解し、溶着不良となる。また、密着した場合でも局所的にみの場合は、不十分な溶着となる。
一方で、水の熱伝導率は80℃で0.67W/mKと、空気に比べ20倍程度大きく、中間材7として使用することで、光吸収性を持つ第二の透明熱可塑性樹脂1の熱膨張時に、熱伝導を起こしやすくすることが可能となる。したがって、中間材7は、粘度が1000mPa・s以下であるとともに、熱伝導率が少なくとも0.2W/mK以上の液状の材質を用いることが望ましく、純水のみならず、アルコールなど可燃性の低い溶剤、プライマー、接着剤などレーザ照射時に揮発する材料が好適である。また、中間材7を介することで、第一の透明熱可塑性樹脂2の接合面の界面での反射の影響を減らすことが可能となり、より効果的に溶着することも可能となる。
以上より、中間材7を含有することは、隙間が発生した場合において、溶着強度の低減の割合を小さくできるロバストな方法であり、これまで示した実施例2,3での方法を併用するとさらに有効な手段となる。また、事前に中間材7を併用することで、密着しているため、加圧時に位置ずれが起こらないこともメリットである。その場合、加圧前に事前に位置出しできるという点で工程によっては有利となる場合もある。なお、本発明では、熱可塑性樹脂材の形態として。剛性の低いフィルムを用いた場合など、加圧による密着を確保することが困難な場合において特に有効な方法である。
図10は、本発明の透明樹脂同士のレーザ接合方法の別の実施例を示す平面図であり、三層の透明な熱可塑性樹脂の接合体を形成するレーザ接合方法である。
光酸化処理した第二の透明樹脂に第一の透明樹脂を密着させ(図10(a))、そこに紫外域のレーザ照射して溶着させ(図10(b))、その後、第一の透明樹脂の接合した面とは反対面に光酸化処理を行い(図10(c))、そこに第三の透明樹脂を密着させ(図10(d))、レーザ照射することで(図10(e))、三枚の透明樹脂を接合する。紫外域のレーザを使用する場合、接合界面側に光酸化処理を実施し、加圧、レーザ照射を繰り返すことで三層の透明な接合体を形成することが可能となる。
これに対して、図11で示した方法では、レーザ光源に超短パルスを使用する。両面に光酸化処理した第二の透明樹脂に第一の透明樹脂を密着させ(図11(a))、そこに超短パルスのレーザ照射して溶着させ(図11(b))、第一の透明樹脂の接合した面とは反対面に第三の透明樹脂を密着させ(図11(c))、レーザ照射することで(図11(d))、三枚の透明樹脂を接合する。そのため、三層を加圧した状態で、光酸化処理を施した接合部分のみに焦点を合わせることで、非線形吸収を起こさせ、接合体を形成できる点でメリットがある。そのため、樹脂は一括して光酸化処理を実施しておけば良く、工程を省ける点でメリットが大きい。
また、これらの方法は三層のみに限らず、それ以上の数の積層も可能である。
図12は、本発明のレーザ接合方法を用いて、DNAシーケンサ用フローセル40の流路部41の周りを封止した時の一例を示す斜視図である。特に、バイオ系や医療系部品の場合、透明体同士の接合が望まれており、かつ、アウトガスや異物を出来る限り除去したいため、本方法を適用するのに最も有効な対象である。また、光ピックアップ、カメラモジュール、マイクロプロジェクタなどレーザ光を使用する製品は、複数のレンズを使用しており、それら複数のレンズ同士の直接接合にも使用可能となる。以上で述べた製品例のみならず、透明な材料同士を接合する対象であれば、本方法はそれら製品全般に有効である。
以上、実施例1-6で述べた本構成は、透明熱可塑性樹脂のみならず、透明熱硬化樹脂でも良く、一方は、ガラス、半導体、鉱石などの無機物も対象の範囲に含まれる。
1…第二の透明熱可塑性樹脂、2…第一の透明熱可塑性樹脂、3…第二の透明熱可塑性樹脂の接合界面の光酸化層、4…第二の透明熱可塑性樹脂の接合界面の酸化層、5…第二の透明熱可塑性樹脂の接合界面の微小凹凸、6…第一の透明熱可塑性樹脂の接合界面の微小凹凸、7…中間材、8…第三の透明熱可塑性樹脂との接合用に第一の透明熱可塑性樹脂の接合界面に形成された光酸化層、9…第三の透明熱可塑性樹脂、10…溶着界面、11…溶着部、20…レーザ光、30…加圧材、40…DNAシーケンサ用フローセル、41…流路、42…孔。
Claims (16)
- 第二の透光性樹脂に、光酸化処理を行う光酸化処理工程と、
前記第二の透光性樹脂の前記光酸化処理を行った面を、第一の透光性部材に対向させ、前記第一の透光性部材と前記第二の透光性樹脂との接合面にレーザ光を照射して前記第一の透光性部材と前記第二の透光性樹脂とを接合させる接合工程と、
を含むことを特徴とするレーザ接合方法。 - 請求項1において、
前記第一の透光性部材及び前記第二の透光性樹脂は透明であり、可視光及び赤外域の透過率が70%以上であることを特徴とするレーザ接合方法。 - 請求項1または2において、
前記第二の透光性樹脂は、光酸化処理後の可視光及び赤外域の透過率が、光酸化処理前の70%以上であることを特徴とするレーザ接合方法。 - 請求項1乃至3のいずれかにおいて、
前記レーザ光は、波長400nm以下の紫外領域のレーザ光であることを特徴とするレーザ接合方法。 - 請求項1乃至3のいずれかにおいて、
前記レーザ光は、パルス幅10ps以下の超短パルスレーザ光であることを特徴とするレーザ接合方法。 - 請求項1乃至5のいずれかにおいて、
前記光酸化処理は、紫外線を用いたUVオゾンもしくはエキシマ処理としたことを特徴とするレーザ接合方法。 - 請求項1乃至6のいずれかにおいて、
前記接合工程では、前記第一の透光性部材と前記第二の透光性樹脂との接合面を加圧しながら接合することを特徴とするレーザ接合方法。 - 請求項1乃至7のいずれかにおいて、
前記第一の透光性部材は、透光性樹脂であり、
前記第一の透光性樹脂と前記第二の透光性樹脂は相溶性を有する同種の熱可塑性樹脂であることを特徴とするレーザ接合方法。 - 請求項1乃至7のいずれかにおいて、
前記第一の透光性樹脂と前記第二の透光性樹脂は、相溶性の有しない異種の熱可塑性樹脂であり、
前記第一の透光性樹脂の接合面側の表面エネルギーを前記第二の透光性樹脂の接合面側の表面エネルギーより大きくした状態で、接合することを特徴とするレーザ接合方法。 - 請求項1乃至7のいずれかにおいて、
前記第一の透光性部材は、透光性樹脂であり、
前記第一の透光性樹脂と前記第二の透光性樹脂は、相溶性の有しない異種の熱可塑性樹脂であり、
前記第一の透光性樹脂のガラス転移温度もしくは融点に比べ、前記第二の透光性樹脂のガラス転移温度もしくは融点が大きい状態で、接合することを特徴とするレーザ接合方法。 - 請求項1乃至10のいずれかにおいて、
前記光酸化処理を行った領域よりも広い領域に前記レーザ照射を行うことを特徴とするレーザ接合方法。 - 請求項1乃至11のいずれかにおいて、
前記第一の透光性部材は、透光性樹脂であり、
前記第一の透光性樹脂に、前記プラズマ処理、コロナ処理、レーザ処理のいずれかの表面改質処理を実施する表面改質処理工程を有し、
前記第二の透光性樹脂の前記光酸化処理を行った面と、前記第一の透光性樹脂の前記表面改質処理を行った面とをレーザ接合することを特徴とするレーザ接合方法。 - 請求項1乃至11のいずれかにおいて、
前記第一の透光性部材は、透光性樹脂であり、
前記第一の透光性樹脂の接合面にも光酸化処理を行うことを特徴とするレーザ接合方法。 - 請求項1乃至13のいずれかにおいて、
少なくとも前記第二の透光性樹脂の接合界面側に微細な凹凸を形成した状態で接合することを特徴とするレーザ接合方法。 - 請求項1乃至14のいずれかにおいて、
前記第二の透光性樹脂の光吸収率を前記第一の透光性部材よりも大きくした状態で、前記第一の透光性部材側から前記レーザを照射して接合することを特徴とするレーザ接合方法。 - 請求項1乃至15のいずれかにおいて、
前記第一の透光性部材と第二の透光性樹脂との間に、透光性な液状の材質を介在させた状態で、レーザを照射して接合することを特徴とするレーザ接合方法。
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JP6861043B2 (ja) * | 2017-02-03 | 2021-04-21 | ポリプラスチックス株式会社 | 樹脂成型品の接合方法 |
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