JP2005125783A - レーザー光線による樹脂の加熱方法及び装置 - Google Patents

レーザー光線による樹脂の加熱方法及び装置 Download PDF

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Publication number
JP2005125783A
JP2005125783A JP2004300115A JP2004300115A JP2005125783A JP 2005125783 A JP2005125783 A JP 2005125783A JP 2004300115 A JP2004300115 A JP 2004300115A JP 2004300115 A JP2004300115 A JP 2004300115A JP 2005125783 A JP2005125783 A JP 2005125783A
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Prior art keywords
laser beam
resin
laser
focal plane
heating
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Ceased
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JP2004300115A
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English (en)
Inventor
Jie-Wei Chen
ジー−ウェイ，チェン
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Leister Process Technologies
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Leister Process Technologies
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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
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/0604—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams
    • B23K26/0608—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams in the same heat affected zone [HAZ]
    • 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
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/0604—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams
    • 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
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/067—Dividing the beam into multiple beams, e.g. multifocusing
    • 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
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam welding
    • B23K26/244—Overlap seam 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
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    • B29C65/1629—Laser beams characterised by the way of heating the interface
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    • 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
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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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    • 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
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    • 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
    • B29C65/1658—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined scanning once, e.g. contour laser welding
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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
    • 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
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    • 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
    • B29C65/1687—Laser beams making use of light guides
    • 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
    • B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/024—Thermal pre-treatments
    • B29C66/0242—Heating, or preheating, e.g. drying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
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    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/22—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns
    • B29C66/221—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns being in the form of a sinusoidal wave
    • 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
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    • B29C66/22—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns
    • B29C66/223—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns being in the form of a triangle wave or of a sawtooth wave, e.g. zigzagged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
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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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    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/80—General aspects of machine operations or constructions and parts thereof
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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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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    • 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
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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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Abstract

【課題】レーザー光線を焦点面に点として用い樹脂を加熱する方法、特にレーザー透過法に基づいて樹脂を溶接する方法、及びレーザー光線を形成する装置からの光線を受ける操作ヘッド光線を用いて樹脂を加熱する装置を提供する。
【解決手段】レーザー光線を用いた焦点面への複数のレーザー光点による樹脂の加熱方法及び装置であり、複数のレーザー光点は多重くさび板を有する光学的構成により実現される。この構成を操作ヘッドに組込み、これにより、任意の輪郭線を有する透過溶接の溶接工程の改良が可能となる。
【選択図】図１

Description

本発明はレーザー光線を焦点面に点として用い樹脂を加熱する方法、特にレーザー透過法に基づいて樹脂を溶接する方法に関する。本発明はレーザー光線を形成する装置からの光線を受ける操作ヘッドによりレーザー光線を用いて樹脂を加熱する装置に関する。
レーザー光線を用いて樹脂を溶接することはよく知られており、いわゆる透過溶接法において、レーザー光線に対して透明な第１の樹脂部材とレーザー光線を吸収する第２の樹脂部材との境界面を加熱し、加圧下で互いに溶接するものである。レーザーを樹脂構成部材の上を走査し、所望の速度で、しかも品質を保証するように、光路に予熱工程を設けることが必要で、それぞれ工程において加熱を周知の方法で行うように配慮すべきである。これについては、複数のレーザー光線を点状に順次導入することにより、樹脂素材は第１の工程において予熱温度へと昇温し、第２の工程において溶接温度へと昇温する方法が知られている。
布地、箔及び封止ネットを積層した防水シート溶接では、溶接継ぎ目の強度を検査するため、溶接後の試験組織が必要となる。レーザー光線を用いて溶接する際には、溶接中に試験組織を生成することも必要となる。通常は二重溶接線の生成によりこの組織も生成する。
一つの光源からそれぞれの方向へ同質の複数の光を発生させる光線分割が知られている。光線分割器の光学的性質により、それぞれの方向への光の強度が決まる。しかし、それぞれに相応の光線を生成、平行化するために、総体的なレンズ構成要素が必要となるので、所要面積及びコストは比較的高くなる。特に、僅かな空間的な光の分割ではこの方法は使用できない。
本発明は、上記課題に基づいて、扱い易さ、柔軟性及び可能な限り光ファイバーを用いること念頭に、複数のレーザー光点を焦点面に生成する可能性を提案することにある。
これらの課題は、請求項１の特徴を有する方法及び装置を記載した請求項の特徴を有する装置により解決される。その他の有益な形態は従属請求項に述べる。
本発明による方法及び装置により、点光線源を光ファイバーや拘束の無い光として任意に発生させ、レンズの組み合わせにより拡大及び平行光とする。平行光は、生成すべきレーザー光点の数に応じて分割される。本明細書では、平面に生成するレーザー光点の数に相当する多重くさび板と称する板を用い、レーザー光点の生成する面は光軸に垂直な面に対してやや傾いている。このくさびは基本的には小角度の偏向プリズムである。２つより多いレーザー光点の場合には、多重くさび板は平面より所定の角度傾いた複数の一点に収束する点を有する平面状のピラミッド構造を示す。多重くさび板を光路の中心に配置し、光軸からの変位に応じて、個々の光点を異なった光強度とすることができる。
従って、本発明は光学系内部にレーザー光線を最小に空間的分割することを実現する可能性を提供する。焦点面上の分割光点の距離の調節は簡単にできる。この構成は操作ヘッド内に組み込みが可能であり、最小の大きさの構造を有し、自由に柔軟に動かすことができる。光学的構成要素のみが光の分割に関与しているので、単一、二重あるいは多重光線を光学的に切替えることができる。分割された光線はほぼ同一の光軸に沿って進むので、最小の調整により幾何学的構成が実現できる。
更には、集光レンズの後方のレーザー光線に対して透明な、特にガラス製の球において分離光は結合し、球の動きに応じてレーザー光線は焦点面へと導かれる。
特にフィルムの溶接に必要とされる平行なジグザグ状の溶接線を生成するために、本発明は更に、光路を横断して動く２つの偏向素子を介してレーザー光点を生成している。特に偏向素子は所定の角度傾けて相対して配置し、交互に光路に動かすようになっている。この配置を操作ヘッドに納めることにより、特に溶接すべき樹脂素材上の透明な球との組み合わせにおいて、ほぼ任意の輪郭線に沿って加熱及び溶接可能となる簡単に操作可能な素子が実現できる。
以下、図面を用いて本発明の実施例を詳細に説明する。
図１はレーザー光線２を放射する光ファイバー１を示す。レーザー光線はレンズ３によって平行光線となり、二重くさび板４に到達する。図からわかるように、平行レーザー光線２′に面する平面が中心から外側に傾斜して、レーザー光線が中心の光軸からやや変位するようにくさび５、６を配置している。このことは図中の後続のレンズ８上の重複する領域７で示される。二重くさび板は、光伝達方向に沿ってレーザー光線がやや変位するように相対して配置した２つのプリズムの役割を果たしている。光線は二つの部分２″に分かれ、平行光線のまま、２つの異なった方向へ伝達していく集光レンズ８により、２つに分かれた光線は焦点面９に集束し、２つの光点１０、１１を形成する。くさび角及び集光レンズの光学的特性が２つの光点１０、１１間の距離を決める。二重くさび板４を回転することにより２つの光点１０、１１は光軸周りを対称的に回転する。
この場合、焦点面における光線の形状は擬似ガウス曲線ではなく、２つの半円を形成するが、依然として通常の点と看做してもよい。この光線でも実質的に樹脂部材を接合する溶接工程に何らの影響も及ぼさない。
光の強度も空間的分割によって決まる（図６参照）。図４Ａに示すような二重溶接線では、２つのレーザー光点の相似性が溶接工程に重要である。図６に示すように二重くさび板４が中心からずれると光の強度分布は非対称となる。この特性は、図４Ｂ、図５及び図６に示すように、予熱過程を組込んだ輪郭線溶接工程に使用できる。溶接の要求度に応じて、２つのレーザー光点間の距離及び予熱／溶接投与エネルギー比率を最適化することができる。
二重くさび板を回転することにより２つのレーザー光点から形成したリングを生成できる。図３Ａの３つのくさび１２、図３Ｂの４つのくさび１２及び図３Ｃの５つのくさび１２あるいはそれ以上のくさびを１つの多重くさび板に配置することにより、それに対応して光線の数を増やすことができる。
例えば図２に示すように、全体の配置を操作ヘッド１３内に組込むことができる。操作ヘッド１３中には、レーザー光線が焦点面へ向かうように、例えばガラスあるいは樹脂のような透明な素材製の回転可能な球２２を末端に配置している。球２２を介して、接合の際に手動あるいは機械的に溶接操作に必要な押圧力を加えることができる。
図４には２つの原理的に可能な溶接操作を示す。図４Ａでは２つの光点１０、１１は矢印の方向に平行に移動し、２つの溶接縫合部１４、１４′を形成している。この方法は特に試験用溝を有するフィルムの溶接に必要となる。図４Ｂでは光点１０、１１が溶接方向に相前後して移動し、唯一の溶接縫合部１４を生成する。この２つの図では便宜上、図１、２に示す光学的配置を原理的に暗示しているのみである。
図５にはレーザー光線に透明な第１の加工部材１５及びその下のレーザー光線を吸収する加工部材１６を示し、溶接方向に相前後して移動する２つの光点１０、１１により互いに溶接される。光点１０、１１は２つの加工部材１５、１６の間の接触面に焦点を結び、焦点面９を形成する。同図に示したグラフは焦点面９の領域における温度を示す。経路に沿った予熱区間２３及び溶接区間２４から全体の工程を構成していることがわかる。
既に述べたように、図６には大きなくさび５及び小さなくさび６を有する二重くさび板４を示し、それに対応して小さな光点１１及び大きな光点１０を焦点面９に形成する。ここでも、溶接方向に移動することによって溶接の予熱を実現している。この図では、経路の関数としての光強度を原理的に暗示している。
図７は溶接方向に移動する２つのレーザー光点１０、１１によって生成する２つの平行なジグザグ状の溶接輪郭線１７、１８を生成する配置を示す。ここでは、二重くさび板４の後方に配置した二重くさび１９をレーザー光線２の光路中の光軸を横切って左右に動かす。その際、境界線２０が二重くさび板４のくさび５、６間の境界線２１に平行になるように二重くさび１９を配置する。
実施例では２つの二重くさびは厚い側が向き合うように構成している。全く同様に、狭い側を向き合わせてもよい。モータ及びそれに対応する機構を用いて簡単で周知の方法により、二重くさび１９の左右の動きが実現できる。
焦点面に２つの光点を生成する光学的配置の原理図 押圧及びレーザー光線の伝達素子としてのガラス球を有する操作ヘッド内に図１の構成を組込んだ図 三重くさび板を示す図 四重くさび板を示す図 五重くさび板を示す図 レーザー光点が平行して移動する２つの樹脂素材の溶接模式図 レーザー光点が相前後して移動する２つの樹脂素材の溶接模式図 ２つの光点が相前後して動く透過溶接法及び各光点の道程の温度分布を示す図 異なった大きさの傾斜面を有する２重くさび板を伴う部分配置及び焦点面の光強度を示す図 焦点面において互いに平行なジグザグ状のレーザー光点の軌跡を生成する配置を示す図
符号の説明
１ 光ファイバー
２、２′、２″ レーザー光線
３ レンズ
４ 二重くさび板
５、６、１２ くさび
７ 重複領域
８ 集光レンズ
９ 焦点面
１０、１１ 光点
１３ 操作ヘッド
１４ 溶接縫合部
１５、１６ 加工部材
１７、１８ 溶接輪郭線
１９ 二重くさび
２０、２１ 境界線
２２ ガラス球
２３ 予熱区間
２４ 溶接区間

Claims (8)

  1. レーザー透過法に基づいて樹脂を溶接するために、焦点面（９）上の単一のレーザー光線（２）からの複数のレーザー光点を用いて樹脂を加熱する方法であって、レーザー光線（２）は第一のレンズ（３）により平行化され、平行化されたレーザー光線（２′）はくさび（５、６；１２）の数に相当する数のレーザー光点（１０、１１）を生成するように多重くさび板（４）を用いて所定の角度変位し、分割され、分割されたレーザー光線（２″）は各々の伝達方向へ集光するレンズ（８）により更に調整され、集光レンズ（８）により焦点面（９）上に光点（１０、１１）を生成することを特徴とする樹脂の加熱方法。
  2. 分離されたレーザー光線は集光レンズ（８）の後方において、レーザー光線に対して透明な球（２２）に入射し、球（２２）の動きに応じて焦点面（９）に導かれることを特徴とする請求項１記載の樹脂の加熱方法。
  3. 個々のくさび（５、６；１２）の大きさに応じてレーザー光点の強度が決まることを特徴とする請求項１記載の樹脂の加熱方法。
  4. レーザー光線（２）を横切って移動する偏向素子（１９）によって生成した２つのレーザー光点（１０、１１）は焦点面（９）上を共にジグザグ状に動くことを特徴とする請求項１記載の樹脂の加熱方法。
  5. 焦点面（９）上にジグザグ状の輪郭線（１７、１８）を生成するように、レーザー光線（２′）を所定の角度、交互に逆に変位させる２つのくさび（１９）をレーザー光路へと動かすことを特徴とする請求項４記載の樹脂の加熱方法。
  6. レーザー光線を用いて樹脂を加熱する装置であって、操作ヘッド（１３）中のレーザー光線（２）の光路に、レーザー光線（２）を平行化する第１のレンズ（３）、くさび（５、６；１２）の数に相当する数のレーザー光点（１０、１１）を生成する多重くさび板（４）及び焦点面（９）上に個々の光点を結ぶ集光レンズ（８）を配置したことを特徴とする樹脂の加熱装置。
  7. 操作ヘッド（１３）は集光レンズ（８）の後方にレーザー光線に透明な球（２２）を備え、操作ヘッド（１３）内において回転可能に配置したことを特徴とする請求項６記載の樹脂の加熱装置。
  8. 多重くさび板（４）を二重くさび板として形成し、該くさび板と集光レンズ（８）の間に２つの偏向くさび（１９）を備え、その境界面（２０）は二重くさび板（４）の境界面（２１）と平行であり、レーザー光線（２）を横切って左右に移動可能であることを特徴とする請求項６あるいは請求項７記載の樹脂の加熱装置。
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