シャドーイング練習: PCB 101 Academy - Learn how printed circuit boards are assembled - 動画で英語スピーキングを学ぶ

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72 文
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I am here at Roy Electronics in Northern Italy
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and I'm going to share with you now the PCB assembly
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process as it starts from the bareboard PCBs to the end customers.
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ProElectronics have implemented a very advanced
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Industry 4 .0 PCB assembly shop floor.
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As you can see, there are hardly any operators in this production floor because they have chosen to implement a very high level of automation.
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This is the shop floor of the future.
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Let's go have a look.
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The burr board goes into the laser marking machine.
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The machine marks a unique serial number which comes from the ERP
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and reports to the output file that the Valor IoT can then collect the data.
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The serial number will enable us to track this specific board and know exactly what happened to it.
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At ROI, the serial numbers are generated by the ERP and are unique to each PCB.
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The screen printer applies the paste through the stencil.
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Each job has a different stencil which is planned with Valor process preparation.
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It must be precise per product and per revision.
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At this station, we can expect a relatively high rate of defects.
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It is very sensitive to environment condition, temperature, humidity, time.
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This is the reason for many tests and inspections after this stage.
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With Valor material management, we can conduct stencil verification by scanning the stencil barcode and reporting the exact stencil and paste we have used.
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The solder paste inspection machine, referenced as SPI, tests the quality of the printer to verify
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that everything was printed according to the plan and there is paste only where it should be.
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The SPI will run the test program and report the findings in a file, including pass -fail as well as measurements.
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This data is later on collected by Valor IoT.
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Roy have three types of pick -and -place machines.
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A fast pick -and -place machine, a machine with a camera for small and subtle components when accuracy is highly important,
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and a very strong machine with high pressure for boards that require force in implementing its components.
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Having different pick -and -place machines is typical to many manufacturers.
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It allows for high accuracy and flexibility.
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Valor process preparation can help in generating the assembly programs.
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Valor IoT manufacturing connects to the pick and place machine and can collect data regarding machine utilization.
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Valor material management helps manage the material on the machine and replacement of material when it's consumed.
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At the visual inspection station, operators can validate that the correct components were placed on the board before continuing in the manufacturing process.
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Valor process preparation can create a documentation which will define for the operator what should be inspected at this stage.
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Here the soldering is done.
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The plan for the oven is referred to as an oven profile.
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The reflow oven is divided into several chambers.
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The speed through each chamber can be different, and each chamber can have a different temperature.
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Valo IoT Manufacturing connects to the reflow oven and receives information regarding the actual temperature and speed of the oven.
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At this station, we wish to ensure
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that each component was placed correctly in the right angle and that the soldering is good.
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Valor process preparation can help us prepare a test program so
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that the exact location where the pins contact the pads will be examined.
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At this point, the SMT process is complete.
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Following the SMT process, we have additional placement technologies such as through -hole and manual assembly.
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At the through -hole station at Roy, we can see that the through -hole components are placed manually on the PCB,
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but they are then soldered in a selective soldering oven.
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There are two methods which are used to perform electrical tests on the PCB.
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Bed of nails for high volume,
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which allows for shorter time of testing but requires expensive development of fixtures or flying probe for high mix small volume.
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It takes longer to program the flying probe and run the test but is much easier to handle new products.
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Valor process preparation can help plan the fixture of the bed
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of nail as well as generate a program for the flying probe machine.
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In addition, Valor IoT will collect data from the different testers including the different electrical measurement as well as the pass fail.
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All Valor manufacturing solutions have been integrated into the CamStar electronics suite.
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Data is sent to the MES, which now runs the entire process.
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For large BGA components, we need to check that the pins reach the right layer.
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These pins are usually behind the component and therefore cannot be tested with AOI machines.
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In this case, we use an x -ray to take an x -ray image of the PCB
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and make sure that the connectivity and the soldering is adequate.
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Now we can actually test the functionality of the completed product.
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The preference is always to find issues through the different processes
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and avoid finding defects at the last stage of the functional test.
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Here, mechanical parts are assembled manually or by a robot.
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At this point, the product assembly is complete.
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That's it.
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The product is ready to be delivered.
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We can package it and send it to the end customer.
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The PCB assembly process has been completed.
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Now that we've learned how PCBs are made, come and join us in leading this industry.
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Siemens.
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Ingenuity for life.

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このレッスンの語彙とスピーキングのポイント

このスピーキングレッスンは、動画「PCB 101 Academy - Learn how printed circuit boards are assembled」を教材にしています。 繰り返し出てくる語は次のとおりです：machine, process, pcb, valor, test。 この動画には、シャドーイング用の文が32文、単語が904語あります。 音声の長さは6:13です。 話す速さは1分あたり約145語で安定しており、シャドーイングしやすいペースです。 英語の頻出3,000語に含まれる単語は78%だけなので、語彙は難しめです。

この動画の重要語彙

動画に出てくる覚えておきたい単語15語を、発音と意味つきで紹介します。

単語発音意味
component 名詞/kəmˈpoʊ.nənt/部分
oven 名詞/ˈʌ.vn̩/オーブン
preparation 名詞/ˌpɹɛpəˈɹeɪʃ(ə)n/準備, 支度
collect 動詞/ˈkɑlɪkt/集める, 収集する
pasta 名詞/ˈpɑ.stə/パスタ
chamber 名詞/ˈt͡ʃeɪ̯mbɚ/寝室, 部屋
operator 名詞/ˈɑpəˌɹeɪtɚ/交換手
pin 名詞/pɪn/ピン, 鋲
generate 動詞/ˈd͡ʒɛn.ə.ɹeɪt/生む, 生み出す
implement 動詞/ˈɪmpləmənt/実行する, 実現する
electronics 名詞/ɪˌlɛkˈtɹɑ.nɪks/電子工学, エレクトロニクス
inspection 名詞/ɪnˈspɛkʃən/検査
connect 動詞/kəˈnɛkt/繋げる
accuracy 名詞/ˈæk.jɚ.ə.si/正確性, 正確さ
nail 名詞/neɪl/爪

この動画の文法

話し手がよく使っている文型を、動画の実際の表現とともに紹介します。

文型動画での表現
受動態 be + 過去分詞 — 誰がするかより、何が起きるかに焦点を当てるare generated · is planned · was printed
現在完了形 have/has + 過去分詞 — 過去の出来事が今も関係しているhave implemented · have chosen · have been integrated
関係詞節 who / which + 節 — 人や物について情報を加えるstencil which is · documentation which will · methods which are

注意したい発音

話し手はI'm, they're, we'veなど、短縮形や弱形を3回使っています。聞こえたとおりの短い形で発音しましょう。

  • 「sh」と「zh」の音: preparation /ˌpɹɛpəˈɹeɪʃ(ə)n/, inspection /ɪnˈspɛkʃən/, measurement /ˈmɛʒ.ə.mənt/, documentation /ˌdɑkjəmɛnˈteɪʃən/, revision /ɹəˈvɪʒ.ən/
  • 長い単語（アクセントの位置に注意）: preparation /ˌpɹɛpəˈɹeɪʃ(ə)n/, operator /ˈɑpəˌɹeɪtɚ/, electronics /ɪˌlɛkˈtɹɑ.nɪks/, electrical /ɪˈlɛktɹɪkəl/, accuracy /ˈæk.jɚ.ə.si/

日本語話者が苦手な音：

  • /r/ と /l/ の区別 — /l/ は舌先を歯茎につけ、/r/ はどこにもつけない: serial /ˈsɪɹ.i.əl/, electronics /ɪˌlɛkˈtɹɑ.nɪks/, electrical /ɪˈlɛktɹɪkəl/, replacement /ɹɪˈpleɪsmənt/, correctly /kəˈɹɛk(t).li/
  • /v/ — /b/ にならないように、上の歯を下唇に当てる: oven /ˈʌ.vn̩/, sensitive /ˈsɛn.sɪt.ɪv/, divide /dɪˈvaɪd/, selective /səˈlɛktɪv/, verify /ˈvɛɹɪfaɪ/
  • /f/ — 「フ」ではなく、上の歯と下唇で出す: defect /ˈdiːfɛkt/, fixture /ˈfɪks.t͡ʃə/, refer /ɹɪˈfɜː/, define /dɪˈfaɪn/, functional /ˈfʌŋkt͡ʃənəl/

この動画での練習方法

  1. まず声を出さずに動画を最後まで聞き、知らない単語をメモします。
  2. 通常の速度で一文ずつシャドーイングし、話し手のリズムに合うまで繰り返します。
  3. 自分の声を録音して元の音声と比べます。component, oven, preparationなどの単語に特に注意しましょう。

シャドーイングとは？英語上達に効果的な理由

シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。

シャドーイングのやり方: ステップ別の完全ガイドを読む →