JP6287897B2 - 照明装置、電子機器、フレーム構造、フレーム構造の製造方法 - Google Patents
照明装置、電子機器、フレーム構造、フレーム構造の製造方法 Download PDFInfo
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- JP6287897B2 JP6287897B2 JP2015046306A JP2015046306A JP6287897B2 JP 6287897 B2 JP6287897 B2 JP 6287897B2 JP 2015046306 A JP2015046306 A JP 2015046306A JP 2015046306 A JP2015046306 A JP 2015046306A JP 6287897 B2 JP6287897 B2 JP 6287897B2
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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
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
- B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
-
- 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
- B29C66/303—Particular design of joint configurations the joint involving an anchoring effect
- B29C66/3032—Particular design of joint configurations the joint involving an anchoring effect making use of protrusions or cavities belonging to at least one of the parts to be joined
- B29C66/30325—Particular design of joint configurations the joint involving an anchoring effect making use of protrusions or cavities belonging to at least one of the parts to be joined making use of cavities belonging to at least one of the parts to be joined
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- 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
- B29C66/73—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
- B29C66/731—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 intensive physical properties of the material of the parts to be joined
- B29C66/7311—Thermal properties
- B29C66/73111—Thermal expansion coefficient
- B29C66/73112—Thermal expansion coefficient of different thermal expansion coefficient, i.e. the thermal expansion coefficient of one of the parts to be joined being different from the thermal expansion coefficient 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
-
- 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
- B29C66/7394—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 thermoset
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B17/00—Connecting constructional elements or machine parts by a part of or on one member entering a hole in the other and involving plastic deformation
- F16B17/008—Connecting constructional elements or machine parts by a part of or on one member entering a hole in the other and involving plastic deformation of sheets or plates mutually
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
- Laser Beam Processing (AREA)
- Health & Medical Sciences (AREA)
- Electromagnetism (AREA)
- Toxicology (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Description
また、本発明による照明装置は、導光板と、導光板の側面に配置される光源と、導光板と光源とを保持するフレーム構造とを備える。フレーム構造は、導光板の背面に配置される金属製の板状部材と、板状部材の外縁部に配置される樹脂製の枠体と、板状部材と枠体との間に配置される樹脂製の光学部品とを含む。板状部材には開口を有する穿孔部が形成されている。穿孔部は、深さ方向において表面側から底部に向けて開口径が大きくなる拡径部と、深さ方向において表面側から底部に向けて開口径が小さくなる第1縮径部とを有する。拡径部が表面側に形成され、第1縮径部が底部側に形成されている。板状部材の穿孔部に光学部品が嵌合され、枠体と光学部品とが溶着されている。
まず、図1〜図3を参照して、本発明の第1実施形態による面光源装置1について説明する。なお、面光源装置1は、本発明の「照明装置」の一例である。
面光源装置1は、複数のLED(発光ダイオード)21と、導光板22と、拡散シート23と、プリズムシート24および25と、反射シート26と、これらを収容するフレーム構造3とを備えている。この面光源装置1は、LED21から導光板22に入射された光が、導光板22の表面全体から均一に出射されるように構成されている。なお、LED21は、本発明の「光源」の一例である。
フレーム構造3は、面光源装置1を補強する金属製の板状部材30と、樹脂製の枠体20とを備えている。このフレーム構造3は、薄型化により剛性が低下した面光源装置1を補強するために設けられている。また、フレーム構造3は、LED21や導光板22などを保持する機能を有する。
ここで、板状部材30の接合領域A1には、図2に示すように、穿孔部31が形成され、その穿孔部31の内周面には、内側に突出する突出部32が形成されている。そして、板状部材30の穿孔部31には、枠体20が充填されて固化されている。すなわち、穿孔部31に枠体20が嵌合されている。なお、図2は、板状部材30および枠体20の接合界面を拡大して模式的に示した図であり、実際には穿孔部31が複数設けられているが、図2では1つだけ示した。
次に、図1〜図4を参照して、第1実施形態による面光源装置1の製造方法について説明する。
第1実施形態では、上記のように、面光源装置1を補強する金属製の板状部材30と、板状部材30の外縁部に配置される樹脂製の枠体20とを備え、突出部32を有する穿孔部31を板状部材30に形成するとともに、その穿孔部31に枠体20が充填されている。このように構成することによって、板状部材30と枠体20とをアンカー効果により機械的に接合することができるので、補強用の金属製の板状部材30から樹脂製の枠体20が外れるのを抑制することができる。また、枠体20と板状部材30とが接合されたフレーム構造3を用いて面光源装置1を補強することにより、面光源装置1の薄型化を図りながら剛性を確保するとともに、面光源装置1を組み立てやすくすることができる。さらに、板状部材30に対して予め枠体20を形成することにより、枠体20の幅を狭くして狭額縁化を図ることができる。
次に、図5〜図9を参照して、フレーム構造3の変形例について説明する。第1実施形態では、板状部材に対する枠体の接合強度が高いので、枠体の形状や配置の自由度を高くすることができる。たとえば、枠体は、板状部材の四辺の少なくとも一辺に設けられていればよい。
次に、図10〜図13を参照して、板状部材30の穿孔部31の変形例について説明する。
次に、図14および図15を参照して、上記した第1実施形態の効果を確認するために行った実験例1について説明する。なお、以下では、フレーム構造の接合評価を行うために、板状部材に対応する金属部材と、枠体に対応する樹脂部材との接合構造体を作製し、その接合構造体についての接合評価を行った。
レーザ:ファイバレーザ(波長1062nm)
周波数:10kHz
出力:3.0W
走査速度:650mm/sec
走査回数:20回
照射間隔:65μm
サブパルス数:20
なお、周波数は、複数(この例では20)のサブパルスによって構成されるパルスの周波数である。つまり、この照射条件では、1秒間に650mm移動しながら65μmの間隔で1万回レーザ(パルス)を照射し、そのパルスが20のサブパルスによって構成されている。なお、走査回数は、レーザが同じ箇所に繰り返し照射される回数である。
予備乾燥:120℃×5時間
金型温度:120℃
シリンダ温度:270℃
保圧:100MPa
このようにして、実施例1の接合構造体500を作製した。なお、樹脂部材502は、板状に形成されており、長さが100mmであり、幅が25mmであり、厚みが3mmである。
不合格(×):「熱衝撃試験後の接合強度」/「熱衝撃試験前の接合強度」<90%
上記した表1に示すように、熱衝撃試験前では、実施例1の接合構造体500は、比較例1の接合構造体に比べて、せん断方向および剥離方向の接合強度が高くなっていた。これにより、実施例1の接合構造体500のように、穿孔部の内周面に突出部を形成することにより、接合強度が向上することが判明した。なお、熱衝撃試験後においても、実施例1の接合構造体500は、比較例1の接合構造体に比べて、せん断方向および剥離方向の接合強度が高くなっていた。
次に、図16〜図18を参照して、本発明の第2実施形態によるフレーム構造3jについて説明する。なお、第2実施形態では、第1実施形態と異なり、板状部材30jおよび枠体20jの間に反射シート26jが挟み込まれている。
まず、板状部材30jの接合領域A2に、複数の穿孔部(図示省略)を形成するとともに、その穿孔部の内周面に突出部(図示省略)を形成する。なお、接合領域A2は、図18に示すように、反射シート26jが配置されない領域であり、かつ、枠体20jが配置される領域に設けられている。また、穿孔部および突出部は、たとえば1パルスが複数のサブパルスで構成されたレーザを照射することによって形成される。具体例としては、上記したファイバレーザマーカMX−Z2000またはMX−Z2050を用いて形成する。
次に、図19および図20を参照して、本発明の第3実施形態によるフレーム構造3kについて説明する。なお、第3実施形態では、第1実施形態と異なり、枠体20kが反射シート26kを介して板状部材30kに接合されている。
まず、板状部材30kの接合領域A3に、複数の穿孔部(図示省略)を形成するとともに、その穿孔部の内周面に突出部(図示省略)を形成する。なお、接合領域A3は、図20に示すように、側面34kに沿って矩形状に設けられている。また、穿孔部および突出部は、たとえば1パルスが複数のサブパルスで構成されたレーザを照射することによって形成される。具体例としては、上記したファイバレーザマーカMX−Z2000またはMX−Z2050を用いて形成する。
次に、図21を参照して、本発明の第4実施形態によるフレーム構造3lについて説明する。なお、第4実施形態では、第1実施形態と異なり、穿孔部31lに縮径部311lが形成されている。
次に、図22〜図25を参照して、板状部材30lの穿孔部31lの変形例について説明する。
次に、上記した第4実施形態の効果を確認するために行った実験例2について説明する。なお、以下では、フレーム構造の接合評価を行うために、板状部材に対応する金属部材と、枠体に対応する樹脂部材との接合構造体を作製し、その接合構造体についての接合評価を行った。
レーザ:ファイバレーザ(波長1062nm)
周波数:10kHz
出力:3.8W
走査速度:650mm/sec
走査回数:20回
照射間隔:65μm
サブパルス数:20
実施例2の接合構造体では、1パルスが複数のサブパルスで構成されるレーザを照射することにより、金属部材の表面には穿孔部が形成されるとともに、その穿孔部の表面から入り込んだ位置に突出部が形成される。すなわち、表2に示すように、開口径R4(図21参照)が、表面の開口径R3(図21参照)および開口径R5(図21参照)よりも小さくなっている。なお、比較例2の金属部材には、すり鉢状(円錐状)の穿孔部が形成されており、実施例2の開口径R4およびR5に対応する形状が形成されていない。
次に、図26を参照して、本発明の第5実施形態によるスマートフォン100について説明する。なお、スマートフォン100は、本発明の「電子機器」の一例である。
なお、今回開示した実施形態は、すべての点で例示であって、限定的な解釈の根拠となるものではない。したがって、本発明の技術的範囲は、上記した実施形態のみによって解釈されるものではなく、特許請求の範囲の記載に基づいて画定される。また、本発明の技術的範囲には、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれる。
3、3a、3b、3c、3d、3e、3j、3k、3l フレーム構造
20、20a、20b、20c、20d、20e、20j、20k 枠体
21 LED(光源)
22 導光板
26j、26k 反射シート(光学部品)
30、30b、30c、30d、30e、30f、30g、30h、30i、30j、30k、30l、30m、30n、30o、30p 板状部材
31、31g、31h、31i、31l、31m、31n、31o、31p 穿孔部
33 表面
100 スマートフォン(電子機器)
102 表示装置
311、312l 拡径部
312、313l 縮径部(第1縮径部)
311l 縮径部(第2縮径部)
313、314l 底部
Claims (9)
- 導光板と、
前記導光板の側面に配置される光源と、
前記導光板と前記光源とを保持するフレーム構造とを備え、
前記フレーム構造は、前記導光板の背面に配置される金属製の板状部材と、前記板状部材の外縁部に配置される樹脂製の枠体と、前記板状部材と前記枠体との間に配置される光学部品とを含み、
前記板状部材の前記枠体が接合される接合領域に、開口を有する穿孔部が形成され、
前記穿孔部は、深さ方向において表面側から底部に向けて開口径が大きくなる拡径部と、深さ方向において表面側から底部に向けて開口径が小さくなる第1縮径部とを有し、
前記拡径部が表面側に形成され、前記第1縮径部が底部側に形成され、
前記板状部材の前記穿孔部に前記枠体が嵌合され、前記接合領域以外の領域で前記板状部材と前記枠体との間に前記光学部品が挟み込まれていることを特徴とする照明装置。 - 導光板と、
前記導光板の側面に配置される光源と、
前記導光板と前記光源とを保持するフレーム構造とを備え、
前記フレーム構造は、前記導光板の背面に配置される金属製の板状部材と、前記板状部材の外縁部に配置される樹脂製の枠体と、前記板状部材と前記枠体との間に配置される樹脂製の光学部品とを含み、
前記板状部材には開口を有する穿孔部が形成され、
前記穿孔部は、深さ方向において表面側から底部に向けて開口径が大きくなる拡径部と、深さ方向において表面側から底部に向けて開口径が小さくなる第1縮径部とを有し、
前記拡径部が表面側に形成され、前記第1縮径部が底部側に形成され、
前記板状部材の前記穿孔部に前記光学部品が嵌合され、前記枠体と前記光学部品とが溶着されていることを特徴とする照明装置。 - 請求項1または2に記載の照明装置において、
前記板状部材は、平面的に見て矩形状に形成され、
前記枠体は、前記板状部材の四辺の少なくとも一辺に設けられていることを特徴とする照明装置。 - 請求項1〜3のいずれか1つに記載の照明装置において、
前記穿孔部は、深さ方向において表面側から底部に向けて開口径が小さくなる第2縮径部を有し、
前記第2縮径部が前記拡径部よりも表面側に形成されていることを特徴とする照明装置。 - 表示装置と、
請求項1〜4のいずれか1つに記載の照明装置とを備えることを特徴とする電子機器。 - 金属製の板状部材と、
前記板状部材の外縁部に配置される樹脂製の枠体と、
前記板状部材と前記枠体との間に配置される光学部品とを備え、
前記板状部材の前記枠体が接合される接合領域に、開口を有する穿孔部が形成され、
前記穿孔部は、深さ方向において表面側から底部に向けて開口径が大きくなる拡径部と、深さ方向において表面側から底部に向けて開口径が小さくなる第1縮径部とを有し、
前記拡径部が表面側に形成され、前記第1縮径部が底部側に形成され、
前記板状部材の前記穿孔部に前記枠体が嵌合され、前記接合領域以外の領域で前記板状部材と前記枠体との間に前記光学部品が挟み込まれていることを特徴とするフレーム構造。 - 金属製の板状部材と、
前記板状部材の外縁部に配置される樹脂製の枠体と、
前記板状部材と前記枠体との間に配置される樹脂製の光学部品とを備え、
前記板状部材には開口を有する穿孔部が形成され、
前記穿孔部は、深さ方向において表面側から底部に向けて開口径が大きくなる拡径部と、深さ方向において表面側から底部に向けて開口径が小さくなる第1縮径部とを有し、
前記拡径部が表面側に形成され、前記第1縮径部が底部側に形成され、
前記板状部材の前記穿孔部に前記光学部品が嵌合され、前記枠体と前記光学部品とが溶着されていることを特徴とするフレーム構造。 - 金属製の板状部材と、前記板状部材の外縁部に配置される樹脂製の枠体と、前記板状部材と前記枠体との間に配置される光学部品とを備えるフレーム構造の製造方法であって、
前記板状部材の前記枠体が接合される接合領域に、開口を有する穿孔部を形成する工程と、
前記板状部材の前記穿孔部に前記枠体を嵌合するとともに、前記接合領域以外の領域で前記板状部材と前記枠体との間に前記光学部品を挟み込む工程とを備え、
前記穿孔部は、深さ方向において表面側から底部に向けて開口径が大きくなる拡径部と、深さ方向において表面側から底部に向けて開口径が小さくなる第1縮径部とを有し、
前記拡径部が表面側に形成され、前記第1縮径部が底部側に形成されることを特徴とするフレーム構造の製造方法。 - 金属製の板状部材と、前記板状部材の外縁部に配置される樹脂製の枠体と、前記板状部材と前記枠体との間に配置される樹脂製の光学部品とを備えるフレーム構造の製造方法であって、
前記板状部材に開口を有する穿孔部を形成する工程と、
前記板状部材の前記穿孔部に前記光学部品を嵌合するとともに、前記枠体と前記光学部品とを溶着する工程とを備え、
前記穿孔部は、深さ方向において表面側から底部に向けて開口径が大きくなる拡径部と、深さ方向において表面側から底部に向けて開口径が小さくなる第1縮径部とを有し、
前記拡径部が表面側に形成され、前記第1縮径部が底部側に形成されることを特徴とするフレーム構造の製造方法。
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