JP5893348B2 - Laser welded structure - Google Patents

Laser welded structure Download PDF

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Publication number
JP5893348B2
JP5893348B2 JP2011245445A JP2011245445A JP5893348B2 JP 5893348 B2 JP5893348 B2 JP 5893348B2 JP 2011245445 A JP2011245445 A JP 2011245445A JP 2011245445 A JP2011245445 A JP 2011245445A JP 5893348 B2 JP5893348 B2 JP 5893348B2
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Prior art keywords
shade
welded portion
lens
welded
molded product
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JP2013101865A (en
Inventor
雄治 安田
雄治 安田
龍彦 山道
龍彦 山道
貴智 藤吉
貴智 藤吉
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Koito Manufacturing Co Ltd
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Koito Manufacturing Co Ltd
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Priority to JP2011245445A priority Critical patent/JP5893348B2/en
Priority to CN2012104429106A priority patent/CN103101191A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1635—Laser beams characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. laser transmission welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7802—Positioning the parts to be joined, e.g. aligning, indexing or centring
    • B29C65/7805—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features
    • B29C65/7814—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features in the form of inter-cooperating positioning features, e.g. tenons and mortises
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114—Single butt joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2422—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical
    • B29C66/24221—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical being circular
    • 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
    • B29C66/348—Avoiding melting or weakening of the zone directly next to the joint area, e.g. by cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • 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
    • 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
    • B29L2031/747—Lightning equipment

Description

本発明は、レーザー光を用いて２つの樹脂成形品を溶接する構造に関する。   The present invention relates to a structure for welding two resin molded articles using laser light.

従来、車両用灯具のレンズとシェードをレーザー光によって溶接する構造が知られている。例えば、図６に示す車両用灯具５１では、透明なレンズ５２と不透明なシェード５３を接合し、レンズ５２のフランジ部５２ａを透過したレーザー光でシェード５３の溶着部５４を溶かし、溶着部５４の溶融樹脂でレンズ５２をシェード５３に溶接している。   Conventionally, a structure in which a lens and a shade of a vehicular lamp are welded with a laser beam is known. For example, in the vehicular lamp 51 shown in FIG. 6, the transparent lens 52 and the opaque shade 53 are joined, and the welded portion 54 of the shade 53 is melted by laser light transmitted through the flange portion 52 a of the lens 52. The lens 52 is welded to the shade 53 with molten resin.

図７（ａ）に示すように、シェード５３の端面には、レンズ５２を光軸方向に位置決めするダボ５６が突設されている。そして、図７（ｂ）に示すように、レーザー溶接機ＬＷから照射したレーザー光ＬＢで溶着部５４を溶かし、ダボ５６をフランジ部５２ａに当て、レンズ５２の沈み込みを防止できるようになっている。なお、特許文献１には、ダボ５６を用いたレーザー溶接構造が記載されている。   As shown in FIG. 7A, a dowel 56 that projects the lens 52 in the optical axis direction protrudes from the end surface of the shade 53. Then, as shown in FIG. 7B, the welding portion 54 is melted by the laser beam LB irradiated from the laser welding machine LW, and the dowel 56 is applied to the flange portion 52a, so that the lens 52 can be prevented from sinking. Yes. In Patent Document 1, a laser welding structure using a dowel 56 is described.

特開２００８−２６２８７６号公報JP 2008-262876 A

ところが、従来のレーザー溶接構造によると、図７（ｃ）に示すように、レーザー光ＬＢが溶着部５４から外れた場合、溶着部５４の一端側でシェード５３に焦げ５７が生じ、溶着部５４の他端側に未溶融部５８が残ることがあった。また、溶着部５４の両端５４ａ（図７ａ参照）はシェード５３の端面からほぼ直角に起立しているので、溶着部５４から外れたレーザー光ＬＢがシェード５３の端面を直射し、焦げ５７が拡散しやすくなるという問題点もあった。   However, according to the conventional laser welding structure, as shown in FIG. 7C, when the laser beam LB is detached from the welded portion 54, a burnt 57 is generated in the shade 53 on one end side of the welded portion 54, and the welded portion 54. In some cases, an unmelted portion 58 may remain on the other end side of. Further, since both ends 54a (see FIG. 7a) of the welded portion 54 stand substantially perpendicularly from the end surface of the shade 53, the laser beam LB deviated from the welded portion 54 directly hits the end surface of the shade 53, and the burnt 57 diffuses. There was also a problem that it was easy to do.

特に、レンズ５２とシェード５３のレーザー溶接にあたっては、溶着部５４の全域が溶けない場合、未溶融部５８がフランジ部５２ａに当たり、ダボ５６が機能しなくなり、レンズ５２の焦点距離に狂いが生じる。焦げ５７や未溶融部５８はレーザー光の照射精度を高めることで発生しにくくなるが、そのためには溶接工程を厳格に管理する必要があり、工数が増えるという別の問題が発生する。   In particular, in laser welding of the lens 52 and the shade 53, when the entire area of the welded portion 54 is not melted, the unmelted portion 58 hits the flange portion 52a, the dowel 56 does not function, and the focal length of the lens 52 is deviated. The burnt 57 and the unmelted portion 58 are less likely to occur by increasing the irradiation accuracy of the laser beam. However, for that purpose, it is necessary to strictly manage the welding process, which causes another problem that man-hours increase.

本発明の目的は、レーザー光をそれほど高精度に照射しなくても、溶着部の両端から焦げや未溶融部を解消できるレーザー溶接構造を提供することにある。   An object of the present invention is to provide a laser welding structure that can eliminate scorching and unmelted portions from both ends of a welded portion without irradiating laser light with such high accuracy.

上記課題を解決するために、本発明は、第１樹脂成形品を透過したレーザー光によって第２樹脂成形品の溶着部を溶融させ、溶融樹脂により第１および第２樹脂成形品を溶接するレーザー溶接構造において、次のような特徴的手段を提供する。   In order to solve the above-described problems, the present invention provides a laser that melts a welded portion of a second resin molded product with laser light transmitted through the first resin molded product and welds the first and second resin molded products with molten resin. The following characteristic means are provided in the welded structure.

（１）第２樹脂成形品の溶着部と重ならない部位の第１樹脂成形品に、少なくとも一部のレーザー光を拡散する拡散部を設けたことを特徴とするレーザー溶接構造。 (1) A laser welding structure characterized in that a diffusion portion for diffusing at least a part of laser light is provided in the first resin molded product at a portion that does not overlap with the welded portion of the second resin molded product.

（２）第１樹脂成形品がレーザー光透過性樹脂で成形されたレンズを含み、第２樹脂成形品がレーザー光吸収性樹脂で成形されたシェードを含み、シェードの端面にレンズを光軸方向に位置決めするダボを突設したことを特徴とする（１）に記載のレーザー溶接構造。 (2) The first resin molded product includes a lens molded with a laser light transmitting resin, the second resin molded product includes a shade molded with a laser light absorbing resin, and the lens is attached to the end surface of the shade in the optical axis direction. The laser welding structure according to (1), wherein a dowel for positioning is protruded.

（３）レンズにシェードの端面と接合するフランジ部を形成し、シェードの端面に溶着部をダボよりも高く突出するように形成し、溶着部と重ならない部位のフランジ部に拡散部を設けたことを特徴とする（２）に記載のレーザー溶接構造。 (3) A flange portion to be joined to the end surface of the shade is formed on the lens, a weld portion is formed to protrude higher than the dowel on the end surface of the shade, and a diffusion portion is provided in the flange portion where the weld portion does not overlap. (2) The laser welded structure according to (2).

（４）溶着部と重なる部位のフランジ部に透明部を形成し、シェードの端面に透明部をレンズの光軸周りで溶着部に位置決めするピンを突設したことを特徴とする（３）に記載のレーザー溶接構造。 (4) (3) characterized in that a transparent portion is formed in a flange portion at a portion overlapping with the welded portion, and a pin for projecting the transparent portion to the welded portion around the optical axis of the lens is provided on the end surface of the shade. The laser welding structure described.

（５）溶着部の両端に５°以上の型抜き角を設定したことを特徴とする（３）または（４）に記載のレーザー溶接構造。 (5) The laser welding structure according to (3) or (4), wherein a die cutting angle of 5 ° or more is set at both ends of the welded portion.

本発明のレーザー溶接構造によれば、第１樹脂成形品の拡散部が溶着部と重ならない部位で第２樹脂成形品を遮蔽するので、照射ブレによって溶着部から外れたレーザー光は拡散部で拡散した状態で第２樹脂成形品に到達し、溶着部と隣接する部位でレーザー光のエネルギー密度が減少する。このため、レーザー光の照射精度をそれほど高くしなくても、溶着部の両端から焦げや未溶融部を解消でき、工程管理が容易になるという効果がある。   According to the laser welding structure of the present invention, the second resin molded product is shielded at a portion where the diffusion portion of the first resin molded product does not overlap with the welded portion. In the diffused state, the second resin molded product is reached, and the energy density of the laser beam decreases at a portion adjacent to the welded portion. For this reason, even if it does not raise the irradiation precision of a laser beam so much, there exists an effect that a burn and an unmelted part can be eliminated from the both ends of a welding part, and process management becomes easy.

本発明の一実施形態を示す車両用灯具の分解斜視図である。It is a disassembled perspective view of the vehicle lamp which shows one Embodiment of this invention. レンズとシェードのレーザー溶接構造を示す立面図である。It is an elevation view which shows the laser welding structure of a lens and a shade. レンズの拡散部とシェードの溶融部を示す正面図である。It is a front view which shows the spreading | diffusion part of a lens, and the fusion | melting part of a shade. レンズとシェードのレーザー溶接方法を示す要部拡大図である。It is a principal part enlarged view which shows the laser welding method of a lens and a shade. 拡散部の変更例を示すレンズおよびシェードの正面図である。It is a front view of the lens and shade which show the example of a change of a spreading | diffusion part. 従来の車両用灯具を示す分解斜視図である。It is a disassembled perspective view which shows the conventional vehicle lamp. 従来のレンズとシェードのレーザー溶接構造を示す要部拡大図である。It is a principal part enlarged view which shows the laser welding structure of the conventional lens and shade.

以下、本発明を車両用灯具に具体化した一実施形態を図面に基づいて説明する。図１に示す車両用灯具１は、第１樹脂成形品としてのレンズ２と、第２樹脂成形品としてのシェード３とを備え、シェード３の内側に光源４が収められている。   Hereinafter, an embodiment in which the present invention is embodied in a vehicular lamp will be described with reference to the drawings. A vehicle lamp 1 shown in FIG. 1 includes a lens 2 as a first resin molded product and a shade 3 as a second resin molded product, and a light source 4 is housed inside the shade 3.

レンズ２は、レーザー光を透過する透明樹脂材料で成形され、周縁に円形のフランジ部２ａが一体的に設けられている。シェード３は、レーザー光を吸収する不透明樹脂材料で成形され、内面に反射膜３ａが被着されている。   The lens 2 is formed of a transparent resin material that transmits laser light, and a circular flange portion 2a is integrally provided on the periphery. The shade 3 is formed of an opaque resin material that absorbs laser light, and a reflective film 3a is attached to the inner surface thereof.

シェード３の端面はフランジ部２ａと同大の円環状に形成され、端面の円周方向４箇所に溶着部５が突設され、溶着部５の両端に約５°またはそれ以上の型抜き角θ（図４ａ参照）が設定されている。溶着部５と異なる位置には４つのダボ６と２本のピン７が突設され、ピン７とフランジ部２ａの切欠８との嵌合によりレンズ２が円周方向に位置決めされる。   The end surface of the shade 3 is formed in an annular shape that is the same size as the flange portion 2 a, and welded portions 5 project from the circumferential direction of the end surface, and a die cutting angle of about 5 ° or more at both ends of the welded portion 5. θ (see FIG. 4a) is set. Four dowels 6 and two pins 7 project from a position different from the welded portion 5, and the lens 2 is positioned in the circumferential direction by fitting the pins 7 and the notches 8 of the flange portion 2a.

そして、図２（ａ）に示すように、溶着部５はダボ６よりも高く突出するように形成され（Ｈ５＞Ｈ６）、図２（ｂ）に示すように、フランジ部２ａを透過したレーザー光ＬＢで溶着部５を溶かし、ダボ６によりレンズ２を光軸方向に位置決めし、溶着部５の溶融樹脂９によってレンズ２をシェード３に溶接するようになっている。   As shown in FIG. 2 (a), the welded portion 5 is formed so as to protrude higher than the dowel 6 (H5> H6), and as shown in FIG. 2 (b), the laser beam transmitted through the flange portion 2a. The welding part 5 is melted by the light LB, the lens 2 is positioned in the optical axis direction by the dowel 6, and the lens 2 is welded to the shade 3 by the molten resin 9 of the welding part 5.

図３に示すように、シェード３の溶着部５と重なる部位のフランジ部２ａには、レーザー光ＬＢを透過させる透明部１０が設けられ、ピン７によってレンズ２の光軸周りで溶着部５に位置決めされる。また、溶着部５と重ならない部位のフランジ部２ａには、レーザー光ＬＢを拡散する拡散部１１が設けられている。拡散部１１は、シェード３と反対側のフランジ部２ａの表面にシボ加工によって形成されている。   As shown in FIG. 3, a transparent portion 10 that transmits the laser beam LB is provided in the flange portion 2 a that overlaps the weld portion 5 of the shade 3, and the weld portion 5 is provided around the optical axis of the lens 2 by the pin 7. Positioned. In addition, a diffusion portion 11 that diffuses the laser beam LB is provided in the flange portion 2a at a portion that does not overlap the welded portion 5. The diffusion part 11 is formed on the surface of the flange part 2a on the opposite side to the shade 3 by a texture process.

上記構成の車両用灯具１において、レンズ２とシェード３のレーザー溶接にあたっては、まず、図４（ａ）に示すように、レンズ２のフランジ部２ａをシェード３の溶着部５に接合する。このとき、図２に示すように、ピン７と切欠８との嵌合によって、フランジ部２ａの透明部１０をシェード３の溶着部５に正確に位置決めすることができる。   In the vehicular lamp 1 configured as described above, when laser welding the lens 2 and the shade 3, first, the flange portion 2 a of the lens 2 is joined to the weld portion 5 of the shade 3 as shown in FIG. At this time, as shown in FIG. 2, the transparent portion 10 of the flange portion 2 a can be accurately positioned on the welded portion 5 of the shade 3 by fitting the pin 7 and the notch 8.

次に、図４（ｂ）に示すように、レーザー溶接機ＬＷからレーザー光ＬＢを照射し、透明部１０を透過したレーザー光ＬＢにより溶着部５を溶融させる。そして、シェード３上のダボ６によりレンズ２の沈み込みを規制した状態で、溶着部５の溶融樹脂９を硬化させ、レンズ２をシェード３に溶接する。   Next, as shown in FIG. 4B, the laser beam LB is irradiated from the laser welding machine LW, and the welded portion 5 is melted by the laser beam LB transmitted through the transparent portion 10. Then, in a state where the sinking of the lens 2 is regulated by the dowel 6 on the shade 3, the molten resin 9 of the welded portion 5 is cured and the lens 2 is welded to the shade 3.

このとき、フランジ部２ａの拡散部１１が溶着部５と重ならない部位でシェード３の端面を遮蔽しているので、図４（ｃ）に示すように、照射ブレによって溶着部５から外れたレーザー光ＬＢが拡散部１１で拡散した状態でシェード３に到達し、溶着部５と隣接する部位でレーザー光ＬＢのエネルギー密度が減少する。したがって、照射精度をさほど高くしなくても、溶着部５の両端から焦げや未溶融部を解消でき、工程管理が容易となる。   At this time, since the end surface of the shade 3 is shielded at a portion where the diffusing portion 11 of the flange portion 2a does not overlap with the welded portion 5, as shown in FIG. 4 (c), the laser detached from the welded portion 5 due to irradiation blurring. The light LB reaches the shade 3 in a state of being diffused by the diffusing portion 11, and the energy density of the laser light LB decreases at a portion adjacent to the weld portion 5. Therefore, even if the irradiation accuracy is not so high, scorching and unmelted portions can be eliminated from both ends of the welded portion 5, and process management becomes easy.

また、透明部１０と重なる範囲では、溶着部５の全域が確実に溶融するので、未溶融部がフランジ部２ａに当たるおそれがなくなり、すべてのダボ６を機能させて、レンズ２の焦点距離を正確に出すことができる。しかも、溶着部５の両端に大きな型抜き角θが設定されているので、溶着部５から外れたレーザー光ＬＢを両端の傾斜部で吸収し、シェード３端面の焦げを確実に防止できる。   Further, since the entire area of the welded portion 5 is reliably melted in the range where it overlaps with the transparent portion 10, there is no possibility that the unmelted portion hits the flange portion 2a, and all the dowels 6 are made to function so that the focal length of the lens 2 is accurately set. Can be put out. In addition, since a large die cutting angle θ is set at both ends of the welded portion 5, the laser beam LB deviated from the welded portion 5 is absorbed by the inclined portions at both ends, and the end surface of the shade 3 can be reliably prevented.

なお、本発明は、上記実施形態に限定されるものではなく、以下に例示するように、発明の趣旨を逸脱しない範囲で、各部の構成を適宜に変更して実施することも可能である。
（ａ）図５に示すように、溶着部５と重ならない範囲のフランジ部２ａにおいて、拡散部１１を透明部１０の両側に部分的に形成し、拡散部１１により溶着部５の両端外側部位を遮蔽すること。 In addition, this invention is not limited to the said embodiment, As shown below, it is also possible to implement suitably changing the structure of each part in the range which does not deviate from the meaning of invention.
(A) As shown in FIG. 5, in the flange portion 2 a in a range that does not overlap with the welded portion 5, the diffused portion 11 is partially formed on both sides of the transparent portion 10, and both end portions of the welded portion 5 are formed by the diffused portion 11. Shield.

（ｂ）拡散部１１をシボ加工によりフランジ部２ａの裏面に形成すること。
（ｃ）拡散部１１をアルミ蒸着によりフランジ部２ａの表面または裏面に形成すること。
（ｄ）溶着部５、ダボ６、ピン７の個数や円周方向位置を適宜変更すること。
（ｅ）本発明をレンズ２とシェード３のレーザー溶接の他に、車両用灯具の前面カバーとランプボディのレーザー溶接に利用すること。
（ｆ）その他、本発明を各種の透明および不透明樹脂成形品のレーザー溶接に応用すること。 (B) The diffusing portion 11 is formed on the back surface of the flange portion 2a by a texture process.
(C) The diffusion portion 11 is formed on the front surface or the back surface of the flange portion 2a by aluminum vapor deposition.
(D) Change the number of welded portions 5, dowels 6 and pins 7 and their circumferential positions as appropriate.
(E) The present invention is used for laser welding of a front cover of a vehicular lamp and a lamp body in addition to laser welding of a lens 2 and a shade 3.
(F) In addition, the present invention is applied to laser welding of various transparent and opaque resin molded products.

１ 車両用灯具
２ レンズ
２ａ フランジ部
３ シェード
５ 溶着部
６ ダボ
７ ピン
９ 溶融樹脂
１０ 透明部
１１ 拡散部
ＬＢ レーザー光
θ 型抜き角 DESCRIPTION OF SYMBOLS 1 Vehicle lamp 2 Lens 2a Flange part 3 Shade 5 Welding part 6 Dowel 7 Pin 9 Molten resin 10 Transparent part 11 Diffusion part LB Laser light (theta) Draft angle

Claims (5)

第１樹脂成形品を透過したレーザー光によって第２樹脂成形品の端面に突設された溶着部を溶融し、溶融樹脂により第１および第２樹脂成形品を溶接するレーザー溶接構造において、
前記第２樹脂成形品の前記溶着部と重なる部位の第１樹脂成形品にレーザー光を透過させる透明部を形成し、前記溶着部と重ならない部位であって前記溶着部よりも低い第２樹脂成形品の端面と対向する部位の第１樹脂成形品に、少なくとも一部のレーザー光を拡散する拡散部を設けたことを特徴とするレーザー溶接構造。 In the laser welding structure in which the welded portion protruding from the end surface of the second resin molded product is melted by laser light transmitted through the first resin molded product, and the first and second resin molded products are welded by the molten resin.
A transparent resin that transmits laser light is formed in a portion of the second resin molded product that overlaps the welded portion, and a second resin that is a portion that does not overlap the welded portion and is lower than the welded portion. A laser welding structure characterized in that a diffusion part for diffusing at least a part of laser light is provided in a first resin molded product at a portion facing an end face of a molded product. 前記第１樹脂成形品がレーザー光透過性樹脂で成形されたレンズを含み、前記第２樹脂成形品がレーザー光吸収性樹脂で成形されたシェードを含み、シェードの端面にレンズを光軸方向に位置決めするダボを突設した請求項１記載のレーザー溶接構造。   The first resin molded product includes a lens molded with a laser light-transmitting resin, the second resin molded product includes a shade molded with a laser light-absorbing resin, and the lens is placed on the end surface of the shade in the optical axis direction. The laser welding structure according to claim 1, wherein a dowel for positioning is protruded. 前記レンズにシェードの端面と接合するフランジ部を形成し、シェードの端面に前記溶着部をダボよりも高く突出するように形成し、溶着部と重なる部位のフランジ部に前記透明部を形成し、溶着部と重ならない部位であって溶着部よりも低いシェードの端面と対向する部位のフランジ部に前記拡散部を設けた請求項２記載のレーザー溶接構造。 Forming a flange portion to be joined to the end surface of the shade on the lens, forming the welded portion on the end surface of the shade so as to protrude higher than the dowel , and forming the transparent portion on the flange portion overlapping the welded portion; The laser welding structure according to claim 2, wherein the diffusion portion is provided in a flange portion at a portion that does not overlap with the welded portion and is opposed to the end face of the shade lower than the welded portion . 前記シェードの端面に前記透明部をレンズの光軸周りで溶着部に位置決めするピンを突設した請求項３記載のレーザー溶接構造。 The laser welding structure according to claim 3 , wherein a pin for positioning the transparent portion on the welded portion around the optical axis of the lens is provided on the end face of the shade . 前記溶着部の両端に５°以上の型抜き角を設定した請求項３または４記載のレーザー溶接構造。   The laser welding structure according to claim 3 or 4, wherein a die cutting angle of 5 ° or more is set at both ends of the welded portion.
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