JP5579532B2 - 樹脂成形品の製造方法 - Google Patents

樹脂成形品の製造方法 Download PDF

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Publication number
JP5579532B2
JP5579532B2 JP2010179349A JP2010179349A JP5579532B2 JP 5579532 B2 JP5579532 B2 JP 5579532B2 JP 2010179349 A JP2010179349 A JP 2010179349A JP 2010179349 A JP2010179349 A JP 2010179349A JP 5579532 B2 JP5579532 B2 JP 5579532B2
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Japan
Prior art keywords
light
resin member
welding
laser beam
housing
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Expired - Fee Related
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JP2010179349A
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JP2012035561A (ja
Inventor
吉裕 財津
和晃 鉾田
辰也 梅山
晋太郎 平林
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Stanley Electric Co Ltd
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Stanley Electric Co Ltd
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Priority to JP2010179349A priority Critical patent/JP5579532B2/ja
Priority to US13/153,375 priority patent/US8728268B2/en
Publication of JP2012035561A publication Critical patent/JP2012035561A/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
    • 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
    • B29C66/301—Three-dimensional joints, i.e. the joined area being substantially non-flat
    • 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
    • B29C65/1635—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
    • B29C65/1638—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 focusing the laser beam on the interface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • 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
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    • 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
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    • B29C65/1654—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined
    • B29C65/1661—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined scanning repeatedly, e.g. quasi-simultaneous laser welding
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • 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
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/542—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles joining hollow covers or hollow 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
    • B29C66/70—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
    • B29C66/72—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 structure of the material of the parts to be joined
    • B29C66/723—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 structure of the material of the parts to be joined being multi-layered
    • 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
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
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Description

本発明は、樹脂成形品の製造方法に関する。
例えば、車両用灯具は、アクリロニトリロスチレンアクリレート（ＡＳＡ）等の吸光性樹脂からなるハウジングと、ポリメチルメタクリレート（ＰＭＭＡ）やポリカーボネート等の透光性樹脂からなるレンズを溶着した樹脂成形品を有することが多い。
レンズとハウジングの間に熱板を挟み、熱板によってレンズとハウジングを加熱溶融し、熱板を外してレンズとハウジングを溶着する熱板溶着において、糸引き現象を抑制できるハウジング用樹脂組成物が知られている（例えば、特許文献１参照）。
また、ハウジングと組み合わせるレンズの表面が曲面である場合を含め、レンズ表面上にレンズ形状に対応可能な弾性導光体と平坦な透明基材を配置し、圧縮加重を加えて弾性導光体とレンズを密着させ、透明基材側からレーザビームを入射し、弾性導光体、レンズを介してレンズとハウジングの接触部を加熱溶融してハウジングとレンズを溶着する方法が提案されている（例えば、特許文献２参照）。
車両用灯具の場合、ハウジングの内面に光反射膜としてアルミニウム膜を蒸着することが多い。ハウジングの溶着部（シール面）に光反射膜があると、通常のレーザ溶着条件では、レーザビームが反射してしまい、溶着不良となってしまう。そのため、蒸着時にハウジングの溶着面にマスキングを行い、当該溶着面には光反射膜を形成しないようにすることが知られている。
特開平１０−３１０６７６号 特開２００４−３４９１２３号
光反射膜の形成時にハウジングの溶着面にマスキングを行う場合には、そのための工程が１つ増えてしまい、製造コストを増加させることになる。また、マスク不良等により、アルミが溶着面に飛散することも考えられる。
本発明の目的は、溶着面に光反射膜が存在する場合にも、レーザビームにより溶着を行える樹脂成形品の製造方法を提供することである。
本発明の一観点によれば、樹脂成形品の製造方法は、（ａ）溶着領域を有する吸光性樹脂部材と、前記吸光性樹脂部材の溶着領域に対応する溶着領域を有する透光性樹脂部材とを準備する工程と、（ｂ）前記吸光性樹脂部材に光反射膜を形成する工程と、（ｃ）ビームスポット径が１．０ｍｍ以下となる第１の焦合状態で、レーザビームを前記吸光性樹脂部材の溶着領域に繰り返し照射し、該溶着領域上に形成された光反射膜を除去する工程と、（ｄ）前記吸光性樹脂部材の溶着領域と前記透光性樹脂部材の溶着領域とを加圧接触状態とし、ビームスポット径が１．５ｍｍ以上３．５ｍｍ以下となる第２の焦合状態で、レーザビームを前記吸光性樹脂部材の溶着領域に繰り返し照射し、前記吸光性樹脂部材と前記透光性樹脂部材とを溶着する工程とを有する。
本発明によれば、溶着面に光反射膜が存在する場合にも、レーザビームにより溶着を行える樹脂成形品の製造方法を提供することができる。
ガルバノスキャナを用いたレーザビーム溶着装置の構成を概略的に示すダイアグラムである。 レーザビーム１２ｓの焦点の位置関係を示す図である。 本発明の実施例による光反射膜剥離工程及び溶着工程を説明するための加工対象物の概略断面図である。
透光性（透明）樹脂部材と吸光性（光吸収性、不透明）樹脂部材を加圧状態で対向、接触させ、透光性樹脂部材側からレーザビームを照射すると、レーザビームは透光性樹脂部材を透過して、吸光性樹脂部材に到達する。レーザビームが吸光性樹脂部材に吸収されると、吸光性樹脂部材を加熱し、軟化させ、さらには溶融する。透光性樹脂部材は、吸光性樹脂部材に加圧下で接しているので、吸光性樹脂部材の熱が透光性樹脂部材にも伝達される。従って、透光性樹脂部材も軟化し、接触領域が増加し、やがて透光性樹脂部材も溶融する。両部材が溶融状態になり溶着が行なわれる。
上記の溶着工程において、吸光性（光吸収性、不透明）樹脂部材の溶着面に光反射膜としてアルミニウム膜（Ａｌ膜）が蒸着されていると、通常のレーザ溶着条件ではレーザビームが反射してしまい溶着をすることができない。
そこで、本発明者らは、表面にアルミニウム膜（Ａｌ膜）等の光反射膜が蒸着された吸光性（光吸収性、不透明）樹脂部材と透光性（透明）樹脂部材とを溶着するにあたり、両部材の溶着工程の前に、Ａｌ膜を剥離する剥離工程を、溶着工程と同一の設備で行うことを検討した。
図１は、ガルバノスキャナを用いたレーザビーム溶着装置の構成を概略的に示すダイアグラムである。レーザ発振器１０から発射するレーザビーム１２が光ファイバ１１を介してスキャンヘッド３１に導入される。スキャンヘッド３１は、焦点調整用光学系１３、第１のガルバノミラ１４、第２のガルバノミラ１５、制御装置１６を含む構成である。
レーザ発振器１０に接続された光ファイバ１１の先端から出射するレーザビーム１２に対して、焦点調整用光学系１３が配置される。焦点調整用光学系１３は、可動レンズを含み、光路上の焦点位置を調整することができる。焦点調整用光学系１３から出射するレーザビームに対し、第１のガルバノミラ１４が配置され、例えば加工面内のｘ方向走査を行なう。第１のガルバノミラ１４で反射されたレーザビームに対して第２のガルバノミラ１５が配置され、例えば加工面内のｙ方向走査を行なう。
制御装置１６は、ガルバノミラ１４，１５、焦点調整用光学系１３の制御を行なう。出射レーザビーム１２ｓは、ガルバノミラ１４，１５によって、ｘｙ面内で２次元走査が行えると共に、焦点調整用光学系１３の調整により、焦点距離を制御してｚ方向に焦点位置を移動することもできる。即ち、レーザビームの焦合位置は３次元走査できる。ガルバノミラは軽量であり、高速走査が可能である。
レーザ発振器としては、例えばＹＡＧ２倍波ないし３倍波のレーザ発振器、半導体レーザ、ファイバレーザ等を用いることができる。２次元走査のみであれば、焦点調整光学系の代わりに、ｆθレンズを備えたスキャンヘッドを用いることもできる。
図２は、レーザビーム１２ｓの焦点の位置関係を示す図である。
収束するレーザビーム１２ｓの焦点位置よりもスキャンヘッド３１（インフォーカス）側にデフォーカスさせることにより、ビーム径をφ１．５〜３．５ｍｍとすることで、溶着領域の広い面積で溶融を生じさせ、強固な接合を得ることができる。なお、デフォーカス点ＤＦは、焦点位置からスキャンヘッド３１の反対方向（アウトフォーカス）にしてもよい。
本発明の実施例による樹脂成形品の製造方法では、まず、アクリロニトリロスチレンアクリレート（ＡＳＡ）等の吸光性樹脂からなる所望の形状（例えば、容器形状）のハウジング２１と、ポリメチルメタクリレート（ＰＭＭＡ）やポリカーボネート等の透光性樹脂からなる所望の形状のレンズ２３とを用意し、ハウジング２１の内側表面にアルミ蒸着膜を周知の蒸着方法等で形成する。その後、後述する光反射膜剥離工程及び溶着工程を同一の設備で行う。なお、本実施例では、アルミ（光反射膜）をハウジング２１の内側表面に蒸着する際に、ハウジング２１の溶着面へのマスキングは必要ない。
図３（Ａ）は、本発明の実施例による光反射膜剥離工程を説明するための加工対象物の概略断面図である。
本発明の実施例では、光反射膜剥離工程と溶着工程とを同一設備で連続して行うので、溶着工程に先駆けて行われる光反射膜剥離工程の段階で、吸光性樹脂で形成された容器形状のハウジング２１の上方に、透光性樹脂で形成され、ハウジング２１の開口部を塞ぐ、レンズ２３が上治具（透光性加圧板）２５に固定されて対向配置されている。レンズ２３の下面には、溶着用のリブ２３ａが形成されている場合を示す。なお、リブ２３ａは必須の構成要件ではない。なお、本実施例では、ハウジング２１は、ＰＥＴ−ＰＢＴで作製し、レンズ２３は、ＰＭＭＡで作製する。
吸光性樹脂で形成された容器形状のハウジング２１の内面及び溶着面２７ａ上には、例えば、Ａｌ蒸着膜等からなる光反射膜２２が形成されている。また、ハウジング２１は、上下方向に移動可能な下治具２４に固定されている。
ハウジング２１とレンズ２３とが合わさっている状態では、Ａｌ膜２２を剥離させても剥離したＡｌを吸引することができないため、図中黒い矢印で示すように、下治具２４を下降させてハウジング２１とレンズ２３を離して吸引を行うスペースを確保する。
レーザビーム１２ｓは上治具（透光性加圧板）２５、レンズ２３を透過し、下方に位置するハウジング２１の溶着面２７ａ上のＡｌ膜２２上面を照射する。スキャンヘッド３１は溶着領域に沿ってレーザビーム１２ｓを走査し、繰り返し照射する。ガルバノミラ１４，１５によって２次元ｘｙ面内の位置を制御すると共に、焦点調整光学系１３によって、z方向焦点距離を制御し、Ａｌ膜剥離用焦合状態(第１の焦合状態)を保つ。
この光反射膜剥離工程における第１の焦合状態では、剥離対象物付近に焦点位置を有する。すなわち、図３（Ａ）に示すように、焦点位置の付近に剥離対象のＡｌ膜２２が位置する状態である。なお、本明細書において、「剥離対象物付近に焦点位置を有する」状態とは、レーザビーム１２ｓのビームスポット径が剥離対象物の表面において１．０ｍｍ以下となる状態である。
本実施例の光反射膜剥離工程では、例えば、レーザ出力３００Ｗ、走査速度１０００ｍｍ/ｓｅｃ、周回数１００周以下で溶着面２７ａ上の２２を昇華させることにより剥離（除去）する。なお、剥離後のＡｌ膜は、昇華するため、例えば、、吸引機で吸引して再付着を防ぐ。
図３（Ｂ）は、本発明の実施例による溶着工程を説明するための加工対象物の概略断面図である。
まず、図３（Ａ）に示すハウジング２１の上方にレンズ２３が上治具（透光性加圧板）２５に固定されて対向配置されている状態から、下治具２４を黒い矢印で示すように上昇させて、レンズ２３下面の溶着用のリブ２３ａを、Ａｌ膜２２を剥離した溶着面２７ａに圧力Ｐで加圧接触させ、図３（Ｂ）に示す状態とする。レーザビーム１２ｓは、上治具２５、レンズ２３を透過し、リブ２３ａに接するハウジング２１の溶着面２７ａを照射する。ガルバノミラの駆動によりリブ（溶着領域）２３ａに沿って照射位置を走査する。ガルバノミラ１４，１５によって２次元ｘｙ面内の位置を制御すると共に、焦点調整光学系１３によって、z方向焦点距離を制御し、溶着用焦合状態(第２の焦合状態)を保つ。
この溶着工程における第２の焦合状態では、レーザビーム１２ｓは、図２を参照して説明したデフォーカスの状態であり、加工対象物よりも遠くに焦点位置を有する。すなわち、図３（Ｂ）に示すように、照射位置（リブ２３ａと溶着面２７ａの接合領域）付近にデフォーカス点ＤＦが来るようにする。すなわち、レーザビーム１２ｓをスキャンヘッド３１（インフォーカス）側にデフォーカスさせることにより、ビーム径をφ１．５〜３．５ｍｍとして、溶着領域の広い面積で溶融を生じさせる。
本実施例の溶着工程では、例えば、レーザ出力１５０Ｗ〜２４０Ｗ程度、走査速度１０００ｍｍ/ｓｅｃ〜２００００ｍｍ／ｓ、周回数１０周〜３００周程度で照射位置を走査する。例えば、ハウジング２１がＡＳＡでダークグレーの場合、レーザ出力を２００Ｗとすることで、溶着領域の広い面積で溶融を生じさせることができる。なお、ハウジング２１の色によりレーザビーム１２ｓの吸収が変わるため、それに合わせてレーザ出力を調整する必要がある。
なお、周回数は、走査速度と溶着面２７ａ（溶着ライン）の周長に基づき設定される。周長／走査速度の割合はほぼ一定で、例えば、周長１２００ｍｍ、走査速度１０，０００ｍｍ／ｓの場合は、周回数は２００周程度が好ましい。また、例えば、周長１２００ｍｍ、走査速度１，０００ｍｍ／ｓの場合は、周回数は２０周程度が好ましい。
なお、レーザビーム１２ｓの軌跡は各周回ごとに同じ軌跡をたどるようにしてもよいし、徐々に外側にずらしていくようにしてもよい。
上述した図３(Ａ)に示す光反射膜剥離工程において、下治具２４を下降位置及びレーザビーム１２ｓの焦点位置は、下治具２４の下降位置において、レーザビーム１２ｓが上述の第１の焦合状態となり、レンズ２３の下面（リブ２３ａ）とハウジング２１の上面（溶着面２７ａ）を接触するように下治具２４を上昇させた位置（上昇位置）において、レーザビーム１２ｓが上述の第２の焦合状態となるように設定する。
なお、本発明の実施例では、下治具２４を上下に移動させることができるので、下治具２４の下降位置において第１の焦合状態となり、上昇位置において第２の焦合状態となるように焦点位置が予め設定できれば、スキャンヘッド３１の焦点調整用光学系１３を省略することができる。
以上、本発明の実施例によれば、下治具２４を上下に移動させることで、レーザビーム１２ｓの焦合状態を変化させることができるので、１つの設備で光反射膜剥離工程と溶着工程を行うことができる。よって、樹脂成形品の加工設備費の低減を図ることができる。
また、本発明の実施例によれば、溶着工程の前に光反射膜剥離工程を行うことで、溶着面２７ａのＡｌ膜２２を剥離（除去）することができるので、ハウジング２１にＡｌ蒸着を行う際にマスキング等を施す必要がない。したがって、樹脂成形品の製造工程からハウジング２１の溶着面２７ａのマスキング工程を省略可能であり、製造コストを低減することができる。
なお、上述の実施例では、ハウジング２１に１つのレンズ２３を溶着したが、インナーレンズとアウターレンズの２つを１つのハウジング２１に同じ工程で溶着するようにしてもよい。
以上実施例に沿って説明したが、本発明はこれらに制限されるものではない。例えば、透光性樹脂部材と吸光性樹脂部材の組み合わせはレンズとハウジングに限らない。宝石などの小型貴重品用ショーケースなどを作製してもよい。その他種々の用途が可能である。種々の変更、置換、改良、組み合わせなどが可能なことは当業者に自明であろう。
１０…レーザ発振器、１１…光ファイバ、１２…レーザビーム、１３…焦点調整用光学系、１４…第１のガルバノミラ、１５…第２のｙガルバノミラ、１６…制御装置、２１…ハウジング、２２…Ａｌ膜、２３…レンズ、２３ａ…リブ、２４…下治具、２５…上治具（透光性加圧板）、２７ａ…溶着面、３１…スキャンヘッド

Claims (1)

  1. （ａ）溶着領域を有する吸光性樹脂部材と、前記吸光性樹脂部材の溶着領域に対応する溶着領域を有する透光性樹脂部材とを準備する工程と、
    （ｂ）前記吸光性樹脂部材に光反射膜を形成する工程と、
    （ｃ）ビームスポット径が１．０ｍｍ以下となる第１の焦合状態で、レーザビームを前記吸光性樹脂部材の溶着領域に繰り返し照射し、該溶着領域上に形成された光反射膜を除去する工程と、
    （ｄ）前記吸光性樹脂部材の溶着領域と前記透光性樹脂部材の溶着領域とを加圧接触状態とし、ビームスポット径が１．５ｍｍ以上３．５ｍｍ以下となる第２の焦合状態で、レーザビームを前記吸光性樹脂部材の溶着領域に繰り返し照射し、前記吸光性樹脂部材と前記透光性樹脂部材とを溶着する工程と
    を有する樹脂成形品の製造方法。
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