JP2010214856A - レーザ溶着方法および同方法を用いて形成した筐体 - Google Patents
レーザ溶着方法および同方法を用いて形成した筐体 Download PDFInfo
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- 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
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- 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
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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
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- 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
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Abstract
【解決手段】本発明のレーザ溶着方法は、第1の接合部材3と第2の接合部材2の重ね合わせ面5,6の端側から、第2の接合部材の重ね合わせ面端にレーザ光を照射し、同レーザ光の吸収による発熱で第2の接合部材の重ね合わせ面を溶解させ、同熱の伝播で第1の接合部材の重ね合わせ面を溶かし、第1の接合部材と第2の接合部材の重ね合わせ面間を溶着する。本発明の筐体は、重ね合わせた重ね合わせ面の端側から、第2の筐体構成部材の重ね合わせ面端にレーザ光を照射することにより、レーザ光の吸収による発熱で第2の筐体構成部材の重ね合わせ面を溶解させ、同熱の伝播で第1の筐体構成部材の重ね合わせ面を溶かし、第1の筐体構成部材と第2の筐体構成部材の重ね合わせ面間を溶着させる。
【選択図】図4
Description
そこで、特許文献1に開示されているように透過部材や吸収部材などに、当初の重なり合う重ね合わせ面の他に、重ね合わせ面とは直交する方向で嵌まり合う重ね合わせ面をそれぞれ形成して、別の経路でレーザ光を吸収部材に到達させることが考えられている。
請求項3に記載の発明は、さらに接合強度が各部で確保されやすいよう、更に、第1の接合部材と第2の接合部材の重ね合わせ面間は、重ね合わせ面と直交する方向から、第1の接合部材を通して第2の接合部材の重ね合わせ面にレーザ光を照射することで行なわれるレーザ溶着を併用して溶着した。
請求項6に記載の発明は、さらに接合強度が筐体各部で確保されやすいよう、更に、第1の筐体構成部材と第2の筐体構成部材の重ね合わせ面間は、重ね合わせ面と直交する方向から、第1の筐体構成部材を通して第2の筐体構成部材の重ね合わせ面にレーザ光を照射することで行なわれるレーザ溶着を併用して溶着した。
したがって、どのような形状の重ね合わせ面でも、安定して重ね合わせ面間をレーザ溶着することができる。しかも、透過部材、吸収部材は、そのままですむから、第1の接合部材、第2の接合部材が大形化したり、コスト的な負担が強いられたりすることはない。
請求項3の発明によれば、さらに第1の接合部材を通して第2の接合部材の重ね合わせ面に照射されたレーザ光によるレーザ溶着の併用により、重ね合わせ面間では、各部に応じた接合強度が確保できる。
請求項5の発明によれば、各筐体構成部材の重ね合わせ面は、レーザ光により効果的に溶融されるので、各部が効果的にレーザ溶着された筐体を得ることができる。
図1は、本発明のレーザ溶着方法が適用される筐体、例えば光電センサのセンサケース1の分解図を示している。このセンサケース1は、例えば前面側の一部を段状といった複雑な3次元的形状に大きく切欠いた樹脂製の箱形状のケース2(本願の第2の接合部材、第2の筐体構成部材に相当)と、この切欠いた部分を補う半箱形状の樹脂製のカバー3(本願の第1の接合部材、第1の筐体構成部材に相当)とを有する。同センサケース1は、ケース2の切欠き部2aに、カバー3が嵌まり合うことで形成される。このセンサケース1内に、各種機器を搭載した回路基板4が収められる。
この場合、レーザ光の照射により、互いに重なり合う、ケース2の段状となった切欠き部2aの縁部全周で形成される環状の重ね合わせ面5と、同重ね合わせ面5と重なるカバー3の段状となった後端部(形状補間のため)の縁部全周で形成される環状の重ね合わせ面6とを溶着する。
すなわち、重ね合わせ面5端は、レーザ光aの吸収により発熱し、重ね合わせ面5を溶解させる。この熱の伝播により相手側の重ね合わせ面6端は溶ける。これらケース2とカバー3との双方の樹脂が溶融しあい、重ね合わせ面5,6間が溶着される。このレーザ溶着が、カバー3の段状部分3cの全周、ケース2の切欠き部2aの全周で連続的に行われ、3次元的形状となった複雑な重ね合わせ面5と同じく重ね合わせ面6とが溶着される。図4(a)〜(d)中のX部は溶着した部分を示す。溶着は、図6に示されるようにカバー3の表面がケース1の表面から突き出るように嵌まる場合でも同じである。
こうしたケース2、カバー3の重ね合わせ面5,6の端側から、ケース2の重ね合わせ面5端をレーザ光aで照射するレーザ溶着方法は、不安定なレーザ溶着を招きやすい通常の手法、すなわち重ね合わせ面5,6と垂直な向きからカバー3内を透過させてレーザ光aを照射するというカバー3に依存した方法でなく、ケース2へ直接的にレーザ光aを照射させるので、たとえ図1および図2に示されるように重ね合わせ面5,6の形状が三次元的になり、カバー3の壁部3bが大きく変動したり、同壁部3bに散乱しやすい部分が形成されることがあっても、常に重ね合わせ面5の各部は安定した光エネルギーのもとで溶解される。このため、図4(a)〜(d)に示されるように重ね合わせ面5,6は、どの部位においても良好に溶着される。
本実施形態は、第1の実施形態のように直接的なレーザ光aの照射だけで、ケース2の重ね合わせ面5とカバー3の重ね合わせ面6の全てをレーザ溶着させたのではなく、一部の重ね合わせ面6の部位については、通常のレーザ溶着、すなわち重ね合わせ面5,6とは直交する方向から、カバー3を透過して、レーザ光bをケース2の重ね合わせ面5に到達させる手法を用いて溶着させたものである。
図8は、本発明の第3の実施形態を示す。
具体的には、例えば図8(a),(b)に示されるように重ね合わせ面5,6のうち、前部域Aだけに、直接的なレーザ光aの照射によって行なうレーザ溶着と、カバー3を通したレーザ光bの照射によって行なうレーザ溶着との双方を施したものである。
但し、第2,3の実施形態において、第1の実施形態と同じ部分には同一符号を付してその説明を省略した。
2 ケース(第2の接合部材、第2の筐体構成部材)
2b 端面部分
3 カバー(第1の接合部材、第1の筐体構成部材)
5,6 重ね合わせ面
a,b レーザ光
Claims (6)
- 第1の接合部材と前記第1の接合部材に比してレーザ光の吸収率が高い部材で形成された第2の接合部材とを重ね合わせ、レーザ光の照射により、重ね合わせた両接合部材の重ね合わせ面を溶着するレーザ溶着方法であって、
前記重ね合わせ面の端側から、前記第2の接合部材の重ね合わせ面端に前記レーザ光を照射して、同レーザ光の吸収による発熱で前記第2の接合部材の重ね合わせ面を溶解させ、同熱の伝播で前記第1の接合部材の重ね合わせ面を溶かし、前記第1の接合部材と第2の接合部材の重ね合わせ面間を溶着する
ことを特徴とするレーザ溶着方法。 - 前記レーザ光が照射される部位は、前記第2の接合部材の重ね合わせ面端をなす端面部分であることを特徴とする請求項1に記載のレーザ溶着方法。
- 更に、前記第1の接合部材と第2の接合部材の重ね合わせ面間は、前記重ね合わせ面と直交する方向から、前記第1の接合部材を通して前記第2の接合部材の重ね合わせ面にレーザ光を照射することで行なわれるレーザ溶着を併用して溶着される
ことを特徴とする請求項1または請求項2に記載のレーザ溶着方法。 - レーザ光を透過する部材で形成された第1の筐体構成部材と、前記第1の筐体構成部材に比してレーザ光の吸収率の高い部材で形成された第2の筐体構成部材とを有し、前記第1の筐体構成部材と前記第2の筐体構成部材とを重ね合わせ、レーザ光の照射で、両筐体構成部材の重ね合わせ面をレーザ溶着して形成される筐体であって、
前記筐体が、前記重ね合わせた重ね合わせ面の端側から、前記第2の筐体構成部材の重ね合わせ面端に前記レーザ光を照射することにより、同レーザ光の吸収による発熱で前記第2の筐体構成部材の重ね合わせ面を溶解させ、同熱の伝播で前記第1の筐体構成部材の重ね合わせ面を溶かし、前記第1の筐体構成部材と第2の筐体構成部材の重ね合わせ面間を溶着させてなる
ことを特徴とする筐体。 - 前記レーザ光が照射される部位は、前記第2の筐体構成部材の重ね合わせ面端をなす端面部分であることを特徴とする請求項4に記載の筐体。
- 更に、前記第1の筐体構成部材と第2の筐体構成部材の重ね合わせ面間は、前記重ね合わせ面と直交する方向から、前記第1の筐体構成部材を通して前記第2の筐体構成部材の重ね合わせ面にレーザ光を照射することで行なわれるレーザ溶着を併用して溶着される
ことを特徴とする請求項4または請求項5に記載の筐体。
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JP2005246692A (ja) * | 2004-03-02 | 2005-09-15 | Denso Corp | 樹脂材のレーザ溶着方法 |
JP2007276305A (ja) * | 2006-04-07 | 2007-10-25 | Tokai Rika Co Ltd | レーザ溶着用治具及び樹脂成型品 |
JP2007296857A (ja) * | 2005-09-21 | 2007-11-15 | Orient Chem Ind Ltd | レーザー溶着体 |
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JP2005246692A (ja) * | 2004-03-02 | 2005-09-15 | Denso Corp | 樹脂材のレーザ溶着方法 |
JP2007296857A (ja) * | 2005-09-21 | 2007-11-15 | Orient Chem Ind Ltd | レーザー溶着体 |
JP2007276305A (ja) * | 2006-04-07 | 2007-10-25 | Tokai Rika Co Ltd | レーザ溶着用治具及び樹脂成型品 |
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