JP2010201695A - Laser welding method and housing - Google Patents

Laser welding method and housing Download PDF

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JP2010201695A
JP2010201695A JP2009047867A JP2009047867A JP2010201695A JP 2010201695 A JP2010201695 A JP 2010201695A JP 2009047867 A JP2009047867 A JP 2009047867A JP 2009047867 A JP2009047867 A JP 2009047867A JP 2010201695 A JP2010201695 A JP 2010201695A
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resin material
laser
welding
laser welding
welded
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JP5479758B2 (en
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Takashi Suzuki
尚 鈴木
Kenichi Soeda
健一 添田
Hideyuki Aizawa
秀之 相澤
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Azbil Corp
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Azbil Corp
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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
    • 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
    • B29C66/1142—Single butt to 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
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
    • B29C66/232—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines
    • 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
    • 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
    • B29C66/69—General aspects of joining filaments 
    • 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
    • B29C65/1612—Infrared [IR] radiation, e.g. by infrared lasers
    • B29C65/1616—Near infrared radiation [NIR], e.g. by YAG lasers
    • 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
    • B29C66/541—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 a substantially flat extra element being placed between and clamped by the joined hollow-preforms
    • B29C66/5414—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 a substantially flat extra element being placed between and clamped by the joined hollow-preforms said substantially flat extra element being rigid, e.g. a plate
    • 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
    • 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
    • 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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3481—Housings or casings incorporating or embedding electric or electronic elements

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Laser Beam Processing (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laser welding method capable of stably laser-welding a first resin material easily transmitting a laser beam and a second resin material hardly transmitting the laser beam compared to the first resin material butting each other. <P>SOLUTION: After a welding part is preliminarily formed (preliminary welding) on the butt part of the first and second resin materials by irradiating the laser beam from the first resin material side toward the second resin material side, the first and second resin materials are closely attached each other to weld (actual welding) by irradiating near the welding part with the laser beam again. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、第１の樹脂材と第２の樹脂材とをレーザ溶着するに好適なレーザ溶着方法およびこのレーザ溶着方法を用いて実現される筐体に関する。   The present invention relates to a laser welding method suitable for laser welding a first resin material and a second resin material, and a housing realized by using this laser welding method.

光電センサの筐体は、その内部に発光素子と受光素子とを収納して水密にシールするものであり、一般的には箱形の密閉容器を形成する第１および第２の部材を互いに突き合わせ、その突き合わせ面を接合して構成される。ちなみに第１および第２の部材は一般的には樹脂材からなり、その接合は突き合わせ面を接着して、または二次成形して、或いは超音波溶着することによって行われる。また光電センサを対象とするものではないが、レーザ光を用いて異種の合成樹脂材をスポット的に溶着する、いわゆるレーザ溶着の手法も提唱されている（例えば特許文献１を参照）。   The housing of the photoelectric sensor contains a light emitting element and a light receiving element therein and seals it in a watertight manner. Generally, the first and second members that form a box-shaped sealed container are brought into contact with each other. The abutting surfaces are joined to each other. Incidentally, the first and second members are generally made of a resin material, and the joining is performed by adhering the butted surfaces, secondary molding, or ultrasonic welding. Although not intended for a photoelectric sensor, a so-called laser welding technique is also proposed in which different types of synthetic resin materials are spot-welded using laser light (see, for example, Patent Document 1).

ちなみに上述したレーザ溶着は、レーザ光を透過する第１の樹脂材と、レーザ光を吸収する第２の樹脂材とを互いに突き合わせた状態で前記第１の樹脂材側から第２の樹脂材に向けてレーザ光を照射し、その突き合わせ面における第２の樹脂材のレーザ光照射部位を溶融させると共に、その溶融熱にて第１の部材を溶融させた後、これらの溶融物を一体に固化させることにより達せられる。   Incidentally, the laser welding described above is performed from the first resin material side to the second resin material in a state where the first resin material that transmits the laser light and the second resin material that absorbs the laser light face each other. The laser beam is irradiated toward the second resin material at the abutting surface, and the first member is melted by the heat of fusion, and then the melt is solidified integrally. To achieve.

特開昭６０−２１４９３１号公報JP-A-60-214931

ところで前述した第１および／または第２の部材の接合面に反り（ソリ）や退け（ヒケ）、或いは歪み等があると、これらの部材を相互に突き合わせても完全に密着することがなく、これに起因してその溶着状態が不安定になることが否めない。ちなみに第１および第２の部材間の接合強度を確保するだけであるならば上記溶着状態のバラツキはさほど問題とはならない。しかし第１の部材と第２の部材とを接合して密閉容器を形成する場合等、その溶着部における水密性（シール性）が必要な場合には、溶着状態の悪い部位において漏れが生じる虞がある。このような不具合を防ぐべく、予め第１の部材および第２の部材の製作精度を高めておくこと等が考えられるが、第１および第２の部材の製造コストの上昇を招く等の問題がある。   By the way, if the joint surface of the first and / or second member described above is warped, warped, sinked, or distorted, even if these members are brought into contact with each other, they do not completely adhere to each other. It cannot be denied that the welding state becomes unstable due to this. Incidentally, the variation in the welded state is not a problem as long as the joining strength between the first and second members is only ensured. However, when watertightness (sealability) is required at the welded portion, such as when the first member and the second member are joined to form an airtight container, leakage may occur at a poorly welded portion. There is. In order to prevent such problems, it may be possible to increase the manufacturing accuracy of the first member and the second member in advance. However, there is a problem that the manufacturing cost of the first and second members is increased. is there.

本発明はこのような事情を考慮してなされたもので、その目的は、レーザ光を透過する第１の樹脂材と、レーザ光を吸収する第２の樹脂材とを互いに突き合わせてレーザ溶着するに際して、接合強度が高く、しかも水密性（シール性）を十分に確保し得る安定した状態の溶着部を容易に形成することのできるレーザ溶着方法を提供することにある。
また本発明は、上記レーザ溶着方法を用いて実現される、例えば光電センサに好適な構造の筐体を提供することにある。 The present invention has been made in view of such circumstances, and the object thereof is to laser-weld a first resin material that transmits laser light and a second resin material that absorbs laser light. At this time, it is an object of the present invention to provide a laser welding method capable of easily forming a welded portion in a stable state with high bonding strength and sufficient water-tightness (sealing property).
Another object of the present invention is to provide a housing having a structure suitable for, for example, a photoelectric sensor, which is realized by using the laser welding method.

本発明は、レーザ光を透過し易い第１の樹脂材と、この第１の樹脂材に比較してレーザ光を透過し難い第２の樹脂材とを互いに突き合わせ、その突き合わせ面の幅よりも小さいスポット径のレーザ光を照射位置を移動させながら前記第１および第２の樹脂材をレーザ溶着する実験過程において、線状に溶着部を形成した１本目のレーザ溶着痕に比較して、その近傍に線状に溶着部を形成した２本目のレーザ溶着痕の方が均一で、その溶着幅の変動がないことに着目してなされている。そして１本目のレーザ溶着痕と２本目のレーザ溶着痕について検証したところ、第２のレーザ溶着痕には第１のレーザ溶着痕中に見られた発泡が減少する等、その溶着状態が安定していることを見出し、これに立脚して本発明がなされている。   In the present invention, a first resin material that easily transmits laser light and a second resin material that does not easily transmit laser light compared to the first resin material are butted together, and the width of the butted surface In the experimental process of laser welding the first and second resin materials while moving the irradiation position of the laser beam with a small spot diameter, compared to the first laser welding trace in which the welded portion is linearly formed, The second laser welding trace in which a linear weld portion is formed in the vicinity is more uniform and there is no variation in the welding width. Then, when the first laser welding trace and the second laser welding trace are verified, the second laser welding trace has a stable state of welding, such as a decrease in foaming observed in the first laser welding trace. The present invention has been made based on this fact.

そこで前述した目的を達成するべく本発明に係るレーザ溶着方法は、レーザ光を透過する第１の樹脂材と、レーザ光を吸収する第２の樹脂材とを互いに突き合わせ、前記第１の樹脂材側から前記第２の樹脂材に向けてレーザ光を照射して前記第１の樹脂材と前記第２の樹脂材とを互いに密着させて接合するに際して、
前記第１の樹脂材側からレーザ光を照射して前記第１および第２の樹脂材との突き合わせ部に溶着部を予備的に形成した後、この溶着部の近傍に再度レーザ光を照射して前記第１および第２の樹脂材を互いに密着させて溶着（本溶着）することを特徴としている。 Therefore, in order to achieve the above-described object, the laser welding method according to the present invention includes a first resin material that transmits a laser beam and a second resin material that absorbs the laser beam, which are brought into contact with each other. When the first resin material and the second resin material are bonded to each other by irradiating a laser beam from the side toward the second resin material,
After irradiating laser light from the first resin material side to preliminarily form a weld portion at the abutting portion with the first and second resin materials, laser light is again irradiated in the vicinity of the weld portion. The first resin material and the second resin material are welded to each other in close contact (main welding).

ちなみに前記レーザ光としては、その照射部位でのスポット径が前記第１の樹脂材と前記第２の樹脂材との突き合わせ部の幅よりも小径のものを用い、また前記レーザ光の照射は、互いに突き合わせた前記第１の樹脂材と前記第２の樹脂材との間を加圧した状態で行うことが望ましい。
また前記第１の樹脂材および第２の樹脂材が、互いに突き合わせて接合されて密閉容器を形成するものである場合には、前記第１の樹脂材と前記第２の樹脂材との突き合わせ部がなす前記密閉容器の接合端面の連なり方向に沿って前記レーザ光の照射位置を移動させて前記溶着部を線状に形成した後（予備溶着処理）、更にこの線状の溶着部の近傍に該溶着部に沿って前記レーザ光の照射位置を連続移動させることで前記第１の樹脂材と前記第２の樹脂材との間を水密に溶着する（本溶着処理）ことが望ましい。 Incidentally, as the laser beam, the spot diameter at the irradiation site is smaller than the width of the butt portion between the first resin material and the second resin material, and the irradiation of the laser beam is as follows: It is desirable to carry out in a state where a pressure is applied between the first resin material and the second resin material which are abutted with each other.
Further, in the case where the first resin material and the second resin material are butted together to form a sealed container, a butt portion between the first resin material and the second resin material The welding position of the laser beam is moved along the continuous direction of the joining end surfaces of the sealed container formed to form the welded portion in a linear shape (preliminary welding treatment), and further in the vicinity of the linear welded portion. It is desirable to weld the first resin material and the second resin material in a water-tight manner (main welding process) by continuously moving the irradiation position of the laser beam along the welding portion.

また本発明に係る筐体は、レーザー光に対する透光性を有する第１の樹脂材と、前記第１の樹脂材に比較してレーザ光を透過し難い第２の樹脂材とを備え、前記第１および第２の樹脂材の互いに突き合わせた突き合わせ部に対して前記第１の樹脂材側から前記第２の樹脂材に向けてレーザ光を照射して前記第１の樹脂材と前記第２の樹脂材との突き合わせ部を互いに密着させて接合して形成されるものであって、
前記第１および第２の樹脂材は、前記接合部の長手方向に対して線状に形成された第１のレーザ溶着部位と、前記第１のレーザ溶着部位の近傍に線状に形成された第２のレーザ溶着部位とによって接合されていることを特徴としている。 Further, a housing according to the present invention includes a first resin material having translucency with respect to laser light, and a second resin material that is less likely to transmit laser light than the first resin material, The first resin material and the second resin material are irradiated with laser light from the first resin material side toward the second resin material with respect to the butted portions of the first and second resin materials that are butted against each other. The butt portion with the resin material is formed in close contact with each other,
The first and second resin materials are linearly formed in the vicinity of the first laser welding portion formed linearly with respect to the longitudinal direction of the joint portion and the first laser welding portion. It is characterized by being joined by the second laser welding portion.

ちなみに前記第１樹脂材および第２の樹脂材は、互いに突き合わせて接合されて密閉容器を形成するものからなる。   By the way, the first resin material and the second resin material are formed to be in contact with each other to form a sealed container.

本発明に係るレーザ溶着方法によれば、予備的に形成した溶着部の近傍に形成した主たる溶着部により、第１の樹脂材と第２の樹脂材とを簡易に、しかも安定に接合（レーザ溶着）することができる。特に第１の樹脂材と第２の樹脂材との接合強度を十分に高くすることができ、またその突き合わせ部（接合部）での水密性（シール性）が必要な場合であっても、その要求を十分に満たし得る安定した状態のレーザ溶着部を容易に形成することができる。   According to the laser welding method of the present invention, the first resin material and the second resin material can be easily and stably joined (laser) by the main weld portion formed in the vicinity of the preliminarily formed weld portion. Welding). In particular, it is possible to sufficiently increase the bonding strength between the first resin material and the second resin material, and even when water tightness (sealability) at the butt portion (joining portion) is necessary, A laser welding portion in a stable state that can sufficiently satisfy the requirement can be easily formed.

また本発明に係る筐体によれば、第１の樹脂材と第２の樹脂材との接合強度を十分に高めた構造を実現し得る。   Moreover, according to the housing | casing which concerns on this invention, the structure which fully heightened the joint strength of the 1st resin material and the 2nd resin material can be implement | achieved.

本発明に係るレーザ溶着方法を用いて組み立てられる光電センサの構造例を示す図。The figure which shows the structural example of the photoelectric sensor assembled using the laser welding method which concerns on this invention. 図１に示す光電センサの筐体の概略的な断面構造を示す図。The figure which shows schematic sectional structure of the housing | casing of the photoelectric sensor shown in FIG. 第１の部材と部位２の部材とのレーザ溶着部分の構造を模式的に示す図。The figure which shows the structure of the laser welding part of the 1st member and the member of the site | part 2 typically. 本発明に係るレーザ溶着方法の処理概念を示す図。The figure which shows the process concept of the laser welding method which concerns on this invention. 本発明に係るレーザ溶着方法による効果を確認する為の検証実験の形態を示す図。The figure which shows the form of the verification experiment for confirming the effect by the laser welding method which concerns on this invention. 本発明に係るレーザ溶着方法による効果を確認する為の別の検証実験の形態を示す図。The figure which shows the form of another verification experiment for confirming the effect by the laser welding method which concerns on this invention.

以下、本発明の一実施形態に係るレーザ溶着方法について説明する。
本発明に係るレーザ溶着方法は、基本的にはレーザ光を透過する第１の樹脂材（例えばＰＡＲ；ポリアリレート）、およびレーザ光を吸収する第２の樹脂材（例えばＰＣ；ポリカーボネート）の各接合面を互いに突き合わせ、第１の樹脂材側から第２の樹脂材に向けてその突き合わせ面（接合面）の幅よりも小さいスポット径のレーザ光を照射して上記接合面におけるレーザ光の照射部位を溶融させた後、冷却（除熱）によってその溶融部を固化することにより前記第１および第２の樹脂材を相互に接合（溶着）するものである。 Hereinafter, a laser welding method according to an embodiment of the present invention will be described.
The laser welding method according to the present invention basically includes each of a first resin material that transmits laser light (for example, PAR; polyarylate) and a second resin material that absorbs laser light (for example, PC; polycarbonate). The joining surfaces are brought into contact with each other, and laser light having a spot diameter smaller than the width of the joining surface (joining surface) is irradiated from the first resin material side toward the second resin material to irradiate laser light on the joining surface. After the portion is melted, the melted portion is solidified by cooling (heat removal), thereby joining (welding) the first and second resin materials to each other.

このようなレーザ溶着方法は、例えば図１に示すような光センサ装置の筐体組立に利用される。ちなみに光センサ装置は、発光素子１と受光素子２とを搭載した回路基板３を、合成樹脂製の密閉筐体４の内部に収納して構成される。この密閉筐体４は、例えば平板状の底面部の周縁を囲む立ち上がり壁を有し、その一端側を開放した箱形形状の第１の部材５および第２の部材６の各開放端面５ａ,６ａを互いに突き合わせ、その突き合わせ面（接合面）間を水密に接合することによって形成される。   Such a laser welding method is used, for example, for assembling a housing of an optical sensor device as shown in FIG. Incidentally, the optical sensor device is configured by housing a circuit board 3 on which the light emitting element 1 and the light receiving element 2 are mounted in a sealed housing 4 made of synthetic resin. The hermetic casing 4 has, for example, a rising wall that surrounds the periphery of a flat bottom surface, and each of the open end faces 5a of the box-shaped first member 5 and the second member 6 with one end thereof open. 6a is abutted against each other, and the abutting surfaces (joint surfaces) are joined in a watertight manner.

尚、前記第１および第２の部材５,６は、例えば縦幅１０ｍｍ、横幅５ｍｍ、高さが２ｍｍ程度の外観形状を有し、底板部および壁部の厚みを０.８ｍｍ程度としてその内部に前記回路基板３を収容する空間部を凹状に形成した箱形形状の射出成形品からなる。特に前記第２の部材６は、前述したレーザ光を吸収する第２の樹脂材からなり、その内側には前記回路基板３を各方向（幅、奥行き、深さ）に対して位置決めして収容する為のボス（図示せず）が設けられている。また第１の部材５は、前述したレーザ光を透過する第１の樹脂材からなり、その底面部にはレンズ５ｂ,５ｂが一体に形成されている。尚、別体として製造したレンズ５ｂ,５ｂを第１の部材５に接着することで、これらを一体化しておくことも可能である。これらのレンズ５ｂ,５ｂは、前記回路基板３を内部に収納して前記第１および第２の部材５,６の各開放端面５ａ,６ａを互いに突き合わせたとき、回路板３に搭載された発光素子１および受光素子２にそれぞれ対峙して、その光学系を形成するものである。   The first and second members 5 and 6 have, for example, an external shape having a vertical width of 10 mm, a horizontal width of 5 mm, and a height of about 2 mm, and the thickness of the bottom plate portion and the wall portion is set to about 0.8 mm. And a box-shaped injection-molded product in which the space for accommodating the circuit board 3 is formed in a concave shape. In particular, the second member 6 is made of the above-described second resin material that absorbs the laser beam, and the circuit board 3 is positioned and accommodated in each direction (width, depth, depth) inside thereof. A boss (not shown) is provided. The first member 5 is made of the first resin material that transmits the laser light described above, and lenses 5b and 5b are integrally formed on the bottom surface thereof. It should be noted that the lenses 5b and 5b manufactured separately can be integrated with each other by bonding them to the first member 5. These lenses 5b and 5b are light-emitting elements mounted on the circuit board 3 when the circuit board 3 is housed inside and the open end surfaces 5a and 6a of the first and second members 5 and 6 are brought into contact with each other. The optical system is formed facing the element 1 and the light receiving element 2, respectively.

そして前記第１および第２の部材５,６のレーザ溶着は、先ず上述した構造の第１および第２の部材５,６を互いに突き合わせ、図示しない治具を用いて第１および第２の部材５,６に歪みが生じない程度の圧力を加えて上記状態を維持する。次いでこの状態において図２に示すように前記第１の部材５側からその突き合わせ面である開放端面５ａ,６ａに向けて、例えばビーム径を０.１〜０.４ｍｍに絞り込んだ微小径の、波長が８００〜１０００ｎｍの赤外レーザ光Ｌを照射し、そのレーザ光の照射部位において第１および第２の部材５,６間を溶着（レーザ溶着）する。この際、上記レーザ光Ｌの照射位置を、いわゆる一筆書きの要領にて前記開放端面５ａ,６ａに沿って連続移動させることにより、前記各開放端面５ａ,６ａ間を、その全周に亘って連続してシーム溶着する。尚、本発明において言うシーム溶着とは上記センサ装置の使用環境において、例えば周囲の水分等がセンサ装置の内部に侵入することによって当該センサ装置の動作に異常が生じない程度の水密性（シール性）を与える溶着形態を指す。   In the laser welding of the first and second members 5 and 6, first, the first and second members 5 and 6 having the above-described structure are brought into contact with each other, and the first and second members are used using a jig (not shown). The above-mentioned state is maintained by applying a pressure that does not cause distortion to the fifth and sixth members. Next, in this state, as shown in FIG. 2, from the first member 5 side toward the open end surfaces 5a and 6a that are the butting surfaces, for example, the beam diameter is narrowed to 0.1 to 0.4 mm, An infrared laser beam L having a wavelength of 800 to 1000 nm is irradiated, and the first and second members 5 and 6 are welded (laser welding) at the irradiated portion of the laser beam. At this time, the irradiation position of the laser beam L is continuously moved along the open end surfaces 5a and 6a in a so-called one-stroke manner, so that the entire circumference of the open end surfaces 5a and 6a is extended. Continuous seam welding. The seam welding referred to in the present invention is a water-tightness (sealing property) that does not cause an abnormality in the operation of the sensor device when, for example, ambient moisture enters the sensor device in the environment where the sensor device is used. ).

尚、ここでのレーザ溶着は、図３に示すように互いに突き合わせた第１および第２の部材５,６の各開放端面（突き合わせ面）５ａ,６ａ間に未溶着領域Ａを残しながら、上述した微小径のレーザ光Ｌの照射部位だけを局部的に溶融させ、これによって第１および第２の部材５,６間を溶着する。この際、第２の部材６の溶融は、第１の部材５を透過したレーザ光のエネルギを吸収して発熱することにより局部的に生じ、また第１の部材５の溶融は上記第２の部材６の溶融熱が伝播することによって生起される。そしてレーザ光Ｌの照射位置の移動に伴って上記レーザ光が照射されなくなった部位では温度が低下し、上述した如く溶融した第１および第２の部材５,６の構成材料が互いに混ざり合って硬化する。これらの溶融部の硬化によって第１および第２の部材５,６間の溶着が短時間のうちに行われ、またレーザ光Ｌが照射されなかった部位は、未溶着領域Ａとして前記レーザ光Ｌの照射軌跡（図１の破線Ｘ）の両側に残される。   The laser welding here is performed as described above while leaving an unwelded region A between the open end surfaces (butting surfaces) 5a and 6a of the first and second members 5 and 6 butted to each other as shown in FIG. Only the irradiated portion of the laser beam L having a small diameter is locally melted, and thereby the first and second members 5 and 6 are welded. At this time, the melting of the second member 6 is locally generated by generating heat by absorbing the energy of the laser beam transmitted through the first member 5, and the melting of the first member 5 is the second This is caused by the propagation of the heat of fusion of the member 6. Then, as the irradiation position of the laser beam L is moved, the temperature of the portion where the laser beam is not irradiated is lowered, and the constituent materials of the first and second members 5 and 6 melted as described above are mixed with each other. Harden. The portion where the first and second members 5 and 6 are welded in a short time due to the curing of these melted portions and the laser beam L is not irradiated is the unwelded region A as the laser beam L. Are left on both sides of the irradiation locus (broken line X in FIG. 1).

この未溶着領域Ａによって第１および第２の部材５,６間の機械的な組み付け位置関係が規定され、その組立精度（寸法精度）が確保される。換言すれば第１および第２の部材５,６の各開放端面（突き合わせ面）５ａ,６ａの全てをレーザ溶着するものとすると、第１および第２の部材５,６の上記各突き合わせ面５ａ,６ａの溶融と、第１および第２の部材５,６間の加圧によって、その組み付け寸法にずれが生じる虞がある。このような不具合を防ぐべく、上記未溶着領域Ａによって組み付け寸法を維持しながら、第１および第２の部材５,６間をレーザ溶着する。   This unwelded region A defines the mechanical assembly positional relationship between the first and second members 5 and 6 and ensures the assembly accuracy (dimensional accuracy). In other words, assuming that all of the open end faces (butting faces) 5a, 6a of the first and second members 5, 6 are laser welded, the above-mentioned butting faces 5a of the first and second members 5, 6 are as follows. , 6a and pressurization between the first and second members 5 and 6 may cause a deviation in the assembly dimensions. In order to prevent such a problem, laser welding is performed between the first and second members 5 and 6 while maintaining the assembly size by the unwelded region A.

ここで本発明に係るレーザ溶着方法について説明すると、その概念を図４(ａ)〜(ｃ)に示すように、先ず予備溶着処理として前記第１の部材（第１の樹脂材）５側からレーザ光Ｌを照射して前記第１および第２の樹脂材（第１の樹脂材）６との突き合わせ部に溶着部Ｂ１を形成した後、本溶着処理として上記溶着部Ｂ１の近傍に再度レーザ光Ｌを照射することで前記第１および第２の部材（樹脂材）５,６を互いに密着させて完全溶着することにある。   Here, the laser welding method according to the present invention will be described. As shown in FIGS. 4 (a) to 4 (c), the concept is as follows. First, as a preliminary welding process, the first member (first resin material) 5 side is used. After irradiating the laser beam L to form the welded portion B1 at the abutting portion with the first and second resin materials (first resin material) 6, the laser is again applied in the vicinity of the welded portion B1 as the main welding process. By irradiating light L, the first and second members (resin materials) 5 and 6 are brought into close contact with each other and completely welded.

具体的には前記第１および第２の部材５,６の各接合面間を互いに突き合わせ、これらの第１および第２の部材５,６に歪みが生じない程度の圧力を加えてその突き合わせ状態を維持する。この状態において、先ず予備溶着処理として１回目のレーザ溶着処理を実行し（図４(ｂ)を参照）、引き続いて上記１回目のレーザ溶着部の近傍に本溶着処理として２回目のレーザ溶着処理を実行する（図４(ｃ)を参照）。   Specifically, the joint surfaces of the first and second members 5 and 6 are butted against each other, and pressure is applied to the first and second members 5 and 6 so as not to cause distortion. To maintain. In this state, first, the first laser welding process is performed as the preliminary welding process (see FIG. 4B), and then the second laser welding process is performed as the main welding process in the vicinity of the first laser welding part. Is executed (see FIG. 4C).

ここで第１および第２の部材５,６を直線状にレーザ溶着した際の、１回目（１本目）の溶着処理（予備溶着）における溶着痕Ｃ１と、２回目（２本目）の溶着処理（本溶着）における溶着痕Ｃ２について調べてみたところ、概略的には図４(ａ)に示すように予備溶着による溶着痕Ｃ１の幅は不規則であるが、これに比して本溶着による溶着痕Ｃ２の幅は均一で安定していることが確認できた。またその接合断面について調べてみたところ、図４(ｃ)に示すように予備溶着による溶着部Ｂ１の近傍には第１の部材５と第２の部材６との間に微小な隙間が存在し、本溶着による溶着部Ｂ２の近傍においては第１および第２の部材５,６が高度に密着していることが確認できた。   Here, when the first and second members 5 and 6 are linearly laser welded, the welding mark C1 in the first (first) welding process (preliminary welding) and the second (second) welding process are performed. When examining the welding mark C2 in (main welding), the width of the welding mark C1 by the preliminary welding is irregular as shown in FIG. 4 (a). It was confirmed that the width of the welding mark C2 was uniform and stable. Further, when the cross section of the joint was examined, as shown in FIG. 4C, a minute gap exists between the first member 5 and the second member 6 in the vicinity of the welded portion B1 formed by the preliminary welding. It was confirmed that the first and second members 5 and 6 were in close contact with each other in the vicinity of the welded part B2 by the main welding.

ちなみに溶着部Ｂ１の近傍に存在する微小な隙間は、第１および第２の部材５,６に存在する反り（ソリ）や退け（ヒケ）等の部品精度（接合面の平坦度）に起因するものであると考えられる。また本溶着による２本目の溶着部Ｂ２の近傍が高度に密着し、均一で安定したレーザ溶着痕Ｃ２が得られた理由は、１本目のレーザ溶着（予備溶着）において第１および第２の部材５,６が局部的に昇熱（例えば３００℃）した後に常温に戻る際、レーザ光Ｌの照射部位の近傍においてもその厚み方向に冷却による収縮が発生して上述した微小な隙間が圧縮されて更に小さく（狭く）なった結果である、或いは１本目のレーザ溶着（予備溶着）において第１および第２の部材５,６におけるレーザ光Ｌの照射部位およびその近傍が熱変形温度以上となり、これによって第１および第２の部材５,６が前述した微小な隙間を埋める形で熱変形した結果であると考えられる。そして予備溶着による１本目のレーザ溶着痕Ｃ１の近傍の、前述した如く微小な隙間が圧縮された部位に２本目のレーザ溶着（本溶着）を施すことにより、第１および第２の部材５,６が互いに密着した状態で溶着され、良好なレーザ溶着痕Ｃ２が得られたものと推定される。   Incidentally, the minute gap existing in the vicinity of the welded portion B1 is caused by the accuracy of parts (flatness of the joint surface) such as warpage or sinking (sink) present in the first and second members 5 and 6. It is thought to be a thing. The reason why the vicinity of the second welding portion B2 by the main welding is highly adhered and a uniform and stable laser welding mark C2 is obtained is that the first and second members in the first laser welding (preliminary welding). When 5 and 6 are heated locally (for example, at 300 ° C.) and then returned to room temperature, shrinkage due to cooling occurs in the thickness direction even in the vicinity of the irradiated portion of the laser beam L, and the above-described minute gap is compressed. In the first laser welding (preliminary welding), the irradiated portion of the laser beam L in the first and second members 5 and 6 and the vicinity thereof are equal to or higher than the thermal deformation temperature, This is considered to be a result of the first and second members 5 and 6 being thermally deformed so as to fill the minute gap described above. Then, by applying the second laser welding (main welding) to the portion where the minute gap is compressed as described above in the vicinity of the first laser welding mark C1 by the preliminary welding, the first and second members 5, It is presumed that 6 was welded in close contact with each other, and a good laser welding mark C2 was obtained.

このような予備溶着と本溶着とによる効果を確かめるべく、本発明者等は次のような検証実験を行った。具体的には厚みが３ｍｍの平板からなる第１の樹脂材（ＰＡＲ；ポリアリレート）５と第２の樹脂材（ＰＣ；ポリカーボネート）６とを用意し、これらを重ね合わせると共に一対のガラス板（治具）の間に挟み込んで０.５ＭＰａの圧力を加えて保持し、図５(ａ)〜(ｅ)に示すように第１および第２の樹脂材５,６を円形にレーザ溶着した。   In order to confirm the effects of such preliminary welding and main welding, the present inventors conducted the following verification experiment. Specifically, a first resin material (PAR; polyarylate) 5 and a second resin material (PC: polycarbonate) 6 made of a flat plate having a thickness of 3 mm are prepared, and are superposed and a pair of glass plates ( The first and second resin materials 5 and 6 were laser welded in a circular shape as shown in FIGS. 5 (a) to 5 (e).

尚、図５(ａ),(ｂ)は、スポット径を０.０５ｍｍと細く絞り込んだレーザ光Ｌにて直径１０ｍｍ、および直径２０ｍｍの円をそれぞれ描いてレーザ溶着（微細溶着）した様子を示している。また図５(ｃ)はスポット径を０.１５ｍｍと太くすると共に、その強度を高くしたレーザ光Ｌにて直径１５ｍｍの円を描いてレーザ溶着（強溶着）した様子を示している。そして図５(ｄ)は図５(ｃ)に示す如く強溶着したレーザ溶着部を予備溶着とし、その内側にスポット径が０.０５ｍｍのレーザ光Ｌを用いて直径１０ｍｍの円をレーザ溶着（微細溶着）した様子を示している。また図５(ｅ)は、更に図５(ｃ)に示す如く強溶着したレーザ溶着部を予備溶着し、その外側にスポット径が０.０５ｍｍのレーザ光Ｌを用いて直径２０ｍｍの円をレーザ溶着（微細溶着）した様子を示している。   5 (a) and 5 (b) show how laser welding (fine welding) is performed by drawing circles having a diameter of 10 mm and a diameter of 20 mm with laser light L narrowed down to a spot diameter of 0.05 mm. ing. FIG. 5C shows a state in which the spot diameter is increased to 0.15 mm and laser welding (strong welding) is performed by drawing a circle having a diameter of 15 mm with the laser beam L having an increased intensity. In FIG. 5 (d), a laser welded portion strongly welded as shown in FIG. 5 (c) is used as a preliminary weld, and a laser beam L having a spot diameter of 0.05mm is used for laser welding of a circle having a diameter of 10mm. It shows the appearance of fine welding. Further, FIG. 5 (e) shows a laser welding portion preliminarily welded with laser welding as shown in FIG. 5 (c), and a laser beam L having a spot diameter of 0.05mm is used as a laser beam L on the outer side. The state of welding (fine welding) is shown.

これらのレーザ溶着した各サンプルのレーザ溶着痕を観察したところ、図５(ａ),(ｂ)にそれぞれ示すように直径１０ｍｍ、および直径２０ｍｍの円を微細溶着しただけのレーザ溶着痕には、気泡が含まれたり、その溶着幅が変動している等の不安定な現象が見られた。また図５(ｃ)に示す如く強溶着したレーザ溶着痕においても、若干ではあるが気泡が含まれたり、その溶着幅が変動している等の不安定な現象が見られた。これに対して図５(ｄ),(ｅ)にそれぞれ示すように、図５(ｃ)に示す如く強溶着したレーザ溶着部を予備溶着とし、その内側および外側に直径１０ｍｍ、および直径２０ｍｍの円を微細溶着（本溶着）したレーザ溶着痕には気泡が減少し、またその溶着幅も全周に亘って略均一であることが確認できた。換言すればスポット径が０.０５ｍｍのレーザ光Ｌを用いて直径１０ｍｍまたは直径２０ｍｍの円をレーザ溶着（微細溶着）するに際し、図５(ｃ)に示す如く予備溶着した円形の溶着痕の近傍に形成することで、非常に安定したレーザ溶着を行い得ることが確認できた。   When laser welding traces of these laser welded samples were observed, as shown in FIGS. 5 (a) and 5 (b), the laser welding traces in which a circle having a diameter of 10 mm and a diameter of 20 mm was finely welded were Unstable phenomena such as bubbles were included and the weld width varied. Further, even in the laser welding traces that were strongly welded as shown in FIG. 5 (c), unstable phenomena such as the inclusion of air bubbles and fluctuations in the welding width were observed. On the other hand, as shown in FIGS. 5 (d) and 5 (e), the laser-welded portion strongly welded as shown in FIG. 5 (c) is pre-welded, and has a diameter of 10 mm and a diameter of 20 mm inside and outside thereof. It was confirmed that bubbles were reduced in the laser welding trace formed by finely welding the circle (main welding), and that the welding width was substantially uniform over the entire circumference. In other words, when a laser beam L having a spot diameter of 0.05 mm is used for laser welding (fine welding) of a circle having a diameter of 10 mm or 20 mm, the vicinity of a circular weld mark preliminarily welded as shown in FIG. It was confirmed that very stable laser welding can be performed by forming the film in the thickness.

尚、第１の樹脂材（ＰＡＲ）５と第２の樹脂材（ＰＣ）６とを重ね合わせて挟み込む圧力を０.５ＭＰａから０.３ＭＰａへと低減し、その他について上述した条件と同様にしてレーザ溶着実験を行ったところ、先の実験と同様な効果が得られることが確認できた。このことから第１の樹脂材（ＰＡＲ）５と第２の樹脂材（ＰＣ）６とを挟み込む圧力についてはレーザ溶着結果に殆ど依存せず、むしろ良好なレーザ溶着が得られるか否かは、予備溶着を行ったか否かであると考えられる。   It should be noted that the pressure for overlapping the first resin material (PAR) 5 and the second resin material (PC) 6 is reduced from 0.5 MPa to 0.3 MPa, and the other conditions are the same as described above. When laser welding experiment was conducted, it was confirmed that the same effect as the previous experiment was obtained. From this, the pressure for sandwiching the first resin material (PAR) 5 and the second resin material (PC) 6 hardly depends on the result of laser welding, and rather whether or not good laser welding can be obtained. This is considered to be whether or not preliminary welding has been performed.

また前述した第１の樹脂材（ＰＡＲ；ポリアリレート）５と第２の樹脂材（ＰＣ；ポリカーボネート）６とを用い、直線状にレーザ溶着した場合についても検証した。図６(ａ)は、スポット径を０.０５ｍｍと細く絞り込んだレーザ光Ｌにて直線状にレーザ溶着（微細溶着）した様子を示しており、図６(ｂ)は、スポット径を０.１５ｍｍと太くし、その強度を高くしたレーザ光Ｌにて直線状にレーザ溶着（強溶着）した様子を示している。そして図６(ｃ)は図６(ｂ)に示す如く強溶着したレーザ溶着部を予備溶着とし、この溶着部から１ｍｍ離れた位置にスポット径が０.０５ｍｍのレーザ光Ｌを用いて上記溶着部と平行に直線状にレーザ溶着（微細溶着）した様子を示している。更に図６(ｄ)は、図６(ｂ)に示す如く強溶着したレーザ溶着部を予備溶着とし、この溶着部から１ｍｍおよび２ｍｍ離れた位置にスポット径が０.０５ｍｍのレーザ光Ｌを用いて上記溶着部と平行にそれぞれ直線状にレーザ溶着（微細溶着）した様子を示している。   Moreover, it verified also about the case where the 1st resin material (PAR; polyarylate) 5 and the 2nd resin material (PC; polycarbonate) 6 which were mentioned above were used and laser-welded linearly. FIG. 6 (a) shows a state where laser welding (fine welding) is performed linearly with a laser beam L narrowed down to a spot diameter of 0.05 mm, and FIG. 6 (b) shows a spot diameter of 0.5mm. The figure shows a state in which laser welding (strong welding) is linearly performed with a laser beam L which is as thick as 15 mm and has an increased intensity. In FIG. 6C, the laser welding portion strongly welded as shown in FIG. 6B is used as a preliminary welding, and the above welding is performed using a laser beam L having a spot diameter of 0.05 mm at a position 1 mm away from the welding portion. A state in which laser welding (fine welding) is performed linearly in parallel with the portion is shown. Further, in FIG. 6D, the laser welding portion strongly welded as shown in FIG. 6B is used as a preliminary welding, and a laser beam L having a spot diameter of 0.05 mm is used at positions 1 mm and 2 mm away from the welding portion. The laser welding (fine welding) is shown in a straight line parallel to the welded portion.

このように直線状にレーザ溶着を行った場合であっても、図６(ａ),(ｂ)にそれぞれ示すように、単に１本のラインを形成してレーザ溶着を行った場合には、その溶着痕の中央部に気泡が見られたり、その溶着幅が不安定になることが見出された。しかし図６(ａ),(ｂ)にそれぞれ示すように、図６(ｂ)に示した１本目のレーザ溶着を予備溶着とし、その溶着部の近傍に２本目のレーザ溶着（本溶着）を行った場合、本溶着におけるレーザ溶着痕が非常に安定していることが確認できた。   Even when laser welding is performed linearly in this way, as shown in FIGS. 6A and 6B, when laser welding is performed by simply forming one line, It was found that bubbles were observed at the center of the welding mark and that the welding width became unstable. However, as shown in FIGS. 6 (a) and 6 (b), the first laser welding shown in FIG. 6 (b) is used as a preliminary welding, and the second laser welding (main welding) is performed in the vicinity of the welding portion. When it performed, it has confirmed that the laser welding trace in this welding was very stable.

かくして本発明に係るレーザ溶着方法に示されるように、レーザ光を透過する第１の樹脂材と、レーザ光を吸収する第２の樹脂材とを互いに突き合わせてレーザ溶着するに際して、予め第１および第２の樹脂材を予備溶着を行った後、その近傍に本溶着を行うことで第１および第２の樹脂材を非常に良好に溶着することができる。特に第１の樹脂材と第２の樹脂材とを線状に連続して溶着する場合、線状のレーザ溶着痕に沿って第１の樹脂材と第２の樹脂材とを確実に密着させて、その溶着部を均一な幅で安定に形成することができるので、当該溶着部での水密性（シール性）を安定に、しかも確実に確保することが可能となる。しかも予備溶着した部位の近傍に本溶着を施すだけで、簡易に安定した高品質な溶着を実現することができると言う、実用上優れた効果を発揮し得る。   Thus, as shown in the laser welding method according to the present invention, when the first resin material that transmits laser light and the second resin material that absorbs laser light are brought into contact with each other and laser welding is performed, first and After the second resin material is pre-welded, the first and second resin materials can be welded very well by performing main welding in the vicinity thereof. In particular, when the first resin material and the second resin material are continuously welded in a linear shape, the first resin material and the second resin material are securely adhered along the linear laser welding trace. Since the welded portion can be stably formed with a uniform width, it is possible to stably and reliably ensure water tightness (sealability) at the welded portion. Moreover, it is possible to achieve a practically excellent effect that a stable and high-quality welding can be realized simply by performing the main welding in the vicinity of the pre-welded portion.

従って第１および第２の樹脂材からなる第１の部品および第２の部品の製造精度（仕上げ面精度）を或る程度確保するだけで、換言すれば接合面の仕上げ面精度を十分に高めることなく、第１の部品と第２の部品とを確実にレーザ溶着することができる。更に溶着部での水密性（シール性）が要求される場合でも、その要求を簡易に、しかも確実に満たし得る等の効果が奏せられる。   Therefore, only a certain degree of manufacturing accuracy (finished surface accuracy) of the first and second parts made of the first and second resin materials is ensured, in other words, the finished surface accuracy of the joint surface is sufficiently increased. Without this, the first component and the second component can be reliably laser-welded. Further, even when water tightness (sealability) at the welded portion is required, such an effect that the request can be satisfied easily and reliably is exhibited.

尚、本発明は上述した実施形態に限定されるものではない。例えば第１の樹脂材としてポリメタクリル酸メチル（ＰＭＭＡ）等であっても良く、また第２の樹脂材としてカーボンフィラーを含むアクリロニトリル-ブタジエン-スチレン（ＡＢＳ）等であっても良い。即ち、第１の樹脂材および第２の樹脂材には種々の材料を適宜用いることができる。またここではレーザ溶着部を線状に形成して、その溶着部での水密性（シール性）を確保する場合を例に説明したが、溶着部をスポット状に形成して第１の樹脂材と第２の樹脂材とを確実にレーザ溶着し、その結合強度を高める場合にも同様に適用することができる。   The present invention is not limited to the embodiment described above. For example, polymethyl methacrylate (PMMA) or the like may be used as the first resin material, and acrylonitrile-butadiene-styrene (ABS) containing a carbon filler may be used as the second resin material. That is, various materials can be used as appropriate for the first resin material and the second resin material. Further, here, the case where the laser welded portion is formed in a linear shape and the water tightness (sealability) at the welded portion is secured is described as an example. However, the welded portion is formed in a spot shape and the first resin material is formed. The second resin material can be reliably laser-welded to increase the bonding strength.

特に本発明に係る筐体については、筐体内に電子回路を内包して所定の水密性が要求される機器、或いは所定の強度が要求される機器の筐体として用いるに特に好適である。例えば第１の樹脂材を用いて一面が開口した箱体を形成すると共に、第２の樹脂材を用いて前記箱体の開口を塞ぐ蓋を形成し、箱体内に電子回路を収納した上で前記箱体の開口を前記蓋体にて閉塞することにより密閉容器状の筐体を形成する場合に好適である。この場合においても前述の手法と同様に第１の樹脂材および第２の樹脂材を２本の溶着によって接合せしめることにより、両樹脂材の結合強度を高めると共に溶着部でのシール性を確保した筐体を製造するようにすれば良い。   In particular, the casing according to the present invention is particularly suitable for use as a casing of a device that encloses an electronic circuit in the casing and requires a predetermined water tightness or a device that requires a predetermined strength. For example, the first resin material is used to form a box with one side opened, and the second resin material is used to form a lid that closes the opening of the box, and the electronic circuit is stored in the box. It is suitable for forming a sealed container-like casing by closing the opening of the box with the lid. In this case as well, the first resin material and the second resin material are joined by two weldings in the same manner as described above, thereby increasing the bonding strength between the two resin materials and ensuring the sealing performance at the welded portion. What is necessary is just to manufacture a housing | casing.

尚、上述した筐体の外側に設けられる他の電子機器やバッテリー等と、当該筐体に内蔵した電子回路とを相互に接続するケーブルの敷設が必要となる場合には、前記筐体にケーブルを挿通するケーブル引き出し孔を設けておくことが必要となる。この場合、前述した溶着部でのシール性の他、ケーブルを挿通した後に上記ケーブル引き出し孔に対して別途樹脂封止する等の適宜な手法を併用すれば、筐体としてのシール性を確保することは可能である。   In addition, when it is necessary to lay a cable for mutually connecting other electronic devices or batteries provided outside the casing and an electronic circuit built in the casing, the cable is attached to the casing. It is necessary to provide a cable pull-out hole for inserting the cable. In this case, in addition to the sealing performance at the welded portion described above, the sealing performance as the housing is ensured by using an appropriate technique such as separately sealing the cable drawing hole after inserting the cable. It is possible.

また予備溶着については、本溶着を確実に行うことができないと想定される部位に対してだけ、具体的には線状にレーザ溶接する場合における溶着開始部位の近傍や、第１および第２の部品における反り（ソリ）や退け（ヒケ）の影響が出易い部分にだけにアシスト的に行うことも可能である。また第１および第２の部品間のレーザ溶着すべき部位（溶着ライン）が予め定められている場合には、その溶着ラインと平行に予備溶着を施せば十分である。また予備溶着する部位と本溶着する部位との離反距離については、第１および第２の樹脂材の各素材（仕様）やレーザ光の強度等によっても異なるが、一般的な樹脂材をレーザ溶着する場合には、２ｍｍ程度の範囲内であれば十分である。その他、本発明はその要旨を逸脱しない範囲で種々変形して実施することができる。   In addition, with regard to the preliminary welding, only the portion where it is assumed that the main welding cannot be reliably performed, specifically, the vicinity of the welding start portion in the case of laser welding in a linear shape, the first and second portions It is also possible to perform the assisting only on the part where the part is easily affected by warpage or sinking. In addition, when a site (welding line) to be laser-welded between the first and second parts is determined in advance, it is sufficient to perform preliminary welding in parallel with the welding line. In addition, the separation distance between the pre-welded part and the main-welded part varies depending on the materials (specifications) of the first and second resin materials, the intensity of the laser beam, and the like, but a general resin material is laser-welded. In that case, it is sufficient if it is within a range of about 2 mm. In addition, the present invention can be variously modified and implemented without departing from the scope of the invention.

１ 発光素子
２ 受光素子
３ 回路基板
５ 第１の部材（第１の樹脂材）
５ｂ レンズ
６ 第２の部材（第２の樹脂材） DESCRIPTION OF SYMBOLS 1 Light emitting element 2 Light receiving element 3 Circuit board 5 1st member (1st resin material)
5b Lens 6 Second member (second resin material)

Claims (6)

レーザ光に対する透光性を有する第１の樹脂材と、この第１の樹脂材に比較してレーザ光を透過し難い第２の樹脂材とを互いに突き合わせ、前記第１の樹脂材側から前記第２の樹脂材に向けてレーザ光を照射して前記第１の樹脂材と前記第２の樹脂材とを互いに密着させて接合するに際し、
前記第１の樹脂材側からレーザ光を照射して前記第１および第２の樹脂材との突き合わせ部に溶着部を形成した後、この溶着部の近傍に再度レーザ光を照射して前記第１および第２の樹脂材を互いに密着させて溶着することを特徴とするレーザ溶着方法。 A first resin material having translucency with respect to laser light and a second resin material that is less likely to transmit laser light than the first resin material are brought into contact with each other, and the first resin material side When the first resin material and the second resin material are bonded to each other by irradiating a laser beam toward the second resin material,
After irradiating a laser beam from the first resin material side to form a welded portion at the abutting portion with the first and second resin materials, the laser beam is again irradiated in the vicinity of the welded portion and the first resin material side is irradiated with the first resin material side. A laser welding method, wherein the first resin material and the second resin material are welded in close contact with each other. 前記レーザ光は、前記第１の樹脂材と前記第２の樹脂材との突き合わせ部の幅よりも小径のスポット径のものである請求項１に記載のレーザ溶着方法。   2. The laser welding method according to claim 1, wherein the laser beam has a spot diameter smaller than a width of a butt portion between the first resin material and the second resin material. 前記レーザ光の照射は、互いに突き合わせた前記第１の樹脂材と前記第２の樹脂材との間を加圧した状態で行われる請求項１に記載のレーザ溶着方法。   2. The laser welding method according to claim 1, wherein the laser light irradiation is performed in a state in which a pressure is applied between the first resin material and the second resin material that face each other. 前記第１の樹脂材および第２の樹脂材は、互いに突き合わせて接合されて密閉容器を形成するものであって、
前記レーザ光の照射は、前記第１の樹脂材と前記第２の樹脂材との突き合わせ部がなす前記密閉容器の接合端面の連なり方向に沿ってその照射位置を移動させて前記溶着部を線状に形成した後、更にこの線状の溶着部の近傍に該溶着部に沿ってその照射位置を連続移動させて行われて、前記第１の樹脂材と前記第２の樹脂材との間を水密に溶着するものである請求項１に記載のレーザ溶着方法。 The first resin material and the second resin material are butted against each other to form a sealed container,
The laser light irradiation is performed by moving the irradiation position along the continuous direction of the joint end surface of the sealed container formed by the abutting portion between the first resin material and the second resin material, thereby forming the welded portion in a line. Is formed by continuously moving the irradiation position along the welded portion in the vicinity of the linear welded portion, and between the first resin material and the second resin material. The laser welding method according to claim 1, wherein water is welded in a watertight manner. レーザー光に対する透光性を有する第１の樹脂材と、前記第１の樹脂材に比較してレーザ光を透過し難い第２の樹脂材とを備え、
前記第１および第２の樹脂材の互いに突き合わせた突き合わせ部に対して前記第１の樹脂材側から前記第２の樹脂材に向けてレーザ光を照射して前記第１の樹脂材と前記第２の樹脂材との突き合わせ部を互いに密着させて接合して形成された筐体であって、
前記第１および第２の樹脂材は、前記接合部の長手方向に対して線状に形成された第１のレーザ溶着部位と、前記第１のレーザ溶着部位の近傍に線状に形成された第２のレーザ溶着部位とによって接合されていることを特徴とする筐体。 A first resin material having translucency with respect to laser light, and a second resin material that is less likely to transmit laser light as compared to the first resin material,
The first resin material and the first resin material are irradiated by irradiating a laser beam from the first resin material side toward the second resin material with respect to the butted portion of the first and second resin materials. A housing formed by bonding the butted portions of the two resin materials in close contact with each other,
The first and second resin materials are linearly formed in the vicinity of the first laser welding portion formed linearly with respect to the longitudinal direction of the joint portion and the first laser welding portion. A housing which is joined to the second laser welding portion. 前記第１樹脂材および第２の樹脂材は、互いに突き合わせて接合されて密閉容器を形成するものである請求項５に記載の筐体。   The housing according to claim 5, wherein the first resin material and the second resin material are butted against each other to form a sealed container.
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