シャドーイング練習: What is SMT (Surface Mount Technology)? PCB Assembly (Part 1) - 動画で英語スピーキングを学ぶ
レッスンを作成中...
1
Music Welcome to the next video in the series of PCBs.
2
Here we're going to be looking at what is an SMT.
3
So using a surface mount technology to assemble PCBs Part 1.
4
Surface Mount Technology Overview.
5
Now, Surface Mount Technology, which is the SMT, is a method for producing electrical circuits in which the components are mounted
6
or placed directly onto the surface of printed circuit boards or PCBs.
7
An electrical device that is soldered to the PCB is called a Surface Mount Device or an SMD for short.
8
By employing SMT, the production process speeds up
9
but the risk of defects also increases due to the component miniaturization and to the denser packing of boards.
10
In these conditions, detection of failures has become critical for any SMT manufacturing process.
11
Let's have a look at the PCBA production process.
12
So manufacturing PCBs with SMA techniques.
13
Manufacturing of printed circuit boards with an automated surface mount assembly,
14
or SMA line, consists of the following sequence of operations.
15
Solder paste application Component placement reflow soldering, cleaning and electrical test In this video,
16
we will concentrate on the first two steps in this process.
17
So we'll look at preassembly steps.
18
So the PCB design and manufacture.
19
Once the PCB has been designed and the components selected, it is time to get the PCB produced and the components ordered.
20
PCBs that are populated on a serviceman assembly line are normally produced in panel formats, as shown on the right hand side here.
21
The SMDs come packaged in different methods from trays for larger components and on tape bound on a reel for smaller components.
22
All the SMDs need to be sourced and made ready to load into the manufacturing line machines.
23
SodaPaste application Let's have a look at the solder paste application process.
24
So once the PCB is loaded into the machine, the stencil is positioned over the panels.
25
Solder paste is then added in front of the squeegee.
26
Let's have a look at that in a diagram format.
27
So we can see here the stencil is lowered onto the PCB, the squeegee is in position,
28
and the solder paste loaded just before the squeegee.
29
The squeegee lowers onto the stencil such that it is applying a very specific amount of pressure.
30
The squeegee moves along the length of the stencil while the solder paste is deposited into the stencil apertures.
31
And you can see that in this image here,
32
where the squeegee has completed its journey and left the solder deposits in the stencil apertures.
33
At the end of the travel, the squeegee raises up and the stencil is separated from the panels.
34
That is depicted here in this image.
35
You can see the stencil is raised leaving the soda paste on the correct positions on the pads.
36
Solder paste issues.
37
So this first one is the acceptable deposit onto a pad.
38
This is what it should be looking like.
39
Some of the issues that could follow are: Slumped deposit of solder paste onto the pad, which just looks like it's just dumped on.
40
Scavenged deposits of solder, and this is where the middle has been scooped out, and you can see that here.
41
Ridging is where a solid paste is connected between Two pads.
42
The last one we're going to look at is peaking or dog ears effect.
43
And you can see that depicted here.
44
So component placement process Let's have a look at that in the PCB design and manufacture.
45
So basic placement sequence generally includes board indexing,
46
board registration, fiducial vision alignment, component pickup component centering or vision inspection,
47
component placement and board indexing, and automated optical inspection, Component pickup.
48
component centering and vision inspection, component placement are repeated for each component.
49
And you can see an example of a component placed on the wet soda pads here.
50
Thank you.
51
Let's have a look at PCB positioning.
52
and the PCB positioning method.
53
Through the process of board indexing, The PCP is loaded to the appropriate position.
54
Fiducial marks provide common measurable points for all steps in the assembly process.
55
The three main types of fiduciary marks are: 1.
56
Panel.
57
This is a global fiducial mark on a multiple printed circuit board fabrication panel
58
that are located outside the parameters of the end product printed circuit boards.
59
You can see an example of that here.
60
2. Global.
61
These are fiduciary marks used to locate the position of all the features on an individual printed circuit port.
62
Again, this is shown here. And three, local.
63
These are fiduciary marks or marks used to locate the position of an individual allowance pattern
64
or component that may require more precision location such as a QFP.
65
and again you can see that here in this image Pick and place types.
66
Let's have a look at the chip shooter type.
67
Now chip shooters are generally fast.
68
They can range between 20 ,000 and 80 ,000 placements per hour
69
and can even range up to 100 ,000 placements per hour with relatively low accuracy, generally in a range of 70 microns.
70
As a result, chip shooters are not generally used for placing a active components which require better accuracy.
71
There are three major types of chip shooters Stationary turret overhead gantry and revolver head.
72
You can see an example of a chip shooter in this picture here.
73
Let's have a look at a flexible placer type Now comparing to chip shooters, these are flexible places are slow.
74
and they range between 6 ,000 to 40 ,000 placements per hour.
75
But they have a high accuracy, as low as 25 microns.
76
As a result, flexible placers are used to place complex and high I -O active components,
77
such as QFPs, as high -performance I -O components generally require higher accuracy.
78
There are three major types of flexible placer, Split axes.
79
Thank you.
80
Vacuum nozzles and grips.
81
Let's have a look at vacuum nozzles.
82
Vacuum nozzles are commonly used for handling all the components during the placement operations.
83
There are a variety of vacuum nozzle sizes for different component sizes.
84
For handling small components, positive pressure is often supplied in addition to vacuum at the moment of placement
85
so that the component will be completely released from the nozzle.
86
You can see a selection of vacuum nozzles in this image here.
87
You can see the different sizes for the vacuum pickup.
88
We also have mechanical grips.
89
Self -centering mechanical grippers allow simultaneous pickup and automatic centering without a need for vacuum.
90
A pair of tweezer type grippers would hold the part while centering it along one axis.
91
Vision inspection.
92
Upward facing vision system.
93
The vision inspection part of the process checks the critical components have been picked correctly.
94
their orientation and other features such as Pin 1 location.
95
All of this data is then fed into the machine to
96
ensure the device is placed into position with the highest accuracy possible.
97
Inline Automated Optical Inspection or AOI.
98
AOI is an automated visual inspection for printed circuit board manufacture
99
where a camera autonomously scans the device under test for both catastrophic failure, in other words missing component,
100
and quality defects such as fillet size or shape of component skew.
101
And this is what that looks like.
102
See the difference between these two.
103
One is up facing and the other is down facing or in this case, top and bottom vision.
104
Don't forget to check out our other videos in this PCB series
105
and you can contact us if you need any help with your projects in China.
106
So don't forget to like, share and subscribe to our channel.
107
And if you hit this little bell symbol that will notify you of every new content that we upload.
108
So thanks for listening, my name is Paul Adams and I shall see you in the next video.
📺 同じチャンネル
C17
What is SMT (Surface Mount Technology)? PCB Assembly (Part 2)
Business EnglishWorking Adults
C1Sofeast PCB Video Series Introduction
Business EnglishUniversity StudentsWorking Adults
B22
DFM And DFA Explained
Business EnglishUniversity StudentsWorking Adults
C13
What is SMT (Surface Mount Technology)? PCB Assembly (Part 3)
Business EnglishUniversity StudentsWorking Adults
C14
PCB Inspection Methods & Common PCB Defects
Business EnglishUniversity StudentsWorking Adults
C13
NPI Process 1: Why A Pilot Run Before Mass Production Is Very Useful
Business EnglishUniversity StudentsWorking Adults
B2BONUS: Should we do PCB or enclosure design first? (Feat Andrew Amirnovin)
Business EnglishUniversity StudentsWorking Adults
B2What are PCBs and PCBAs? The 'PCB basics'
University StudentsWorking Adults
B1Don’t Approve a Product Until You’ve Lived With It
Business EnglishWorking Adults
B1The Product Passed the Safety Test, But Was Still Too Hot to Hold
Business EnglishWorking Adults
B2The Product Worked, But the Packaging Made It Look Dead
Business EnglishWorking Adults
B2Why User Experience Is Harder Than Engineering
Business EnglishUniversity StudentsWorking Adults
C14 NPI Tips Before You Move Into Mass Production
Business EnglishWorking Adults
C1The Production Validation Test (PVT) Phase of the NPI Process
Business EnglishWorking Adults
C1The Three NPI Phases Explained
Business EnglishUniversity StudentsWorking Adults
C1When Can The NPI Process Begin?
Business EnglishUniversity StudentsWorking Adults
C1NPI Process #3: Why A Feasibility Study With Suppliers Saves Time & Prevents Issues
Business EnglishWorking Adults
C1NPI Process 2: New Product Development Process (Why Planning Before Prototyping Saves Time)
Business EnglishUniversity StudentsWorking Adults
C1PCBs | Electronic Goods Reliability Testing
Business EnglishUniversity StudentsWorking Adults
✨ おすすめ動画
C12
12 文
Plastic Injection Molding
Business EnglishUniversity StudentsWorking Adults
C11
64 文
What is SCADA?
Business EnglishUniversity StudentsWorking Adults
C12
153 文
S3 Speech1 short
Business EnglishUniversity StudentsWorking Adults
C11
282 文
什麼是屏蔽罩(shielding can)？工程師對屏蔽罩的愛恨情仇
Business EnglishUniversity StudentsWorking Adults
C11
4 文
Ambr®️ 250 High Throughput Perfusion Product Tutorial - Learn with Sartorius
Business EnglishUniversity StudentsWorking Adults
C1101 文
BGP Overview
Business EnglishUniversity StudentsWorking Adults
C11
40 文
The Engineering that Runs the Digital World 🛠️⚙️💻 How do CPUs Work?
Business EnglishUniversity StudentsWorking Adults
C11
150 文
Parallel Pump Operation
Business EnglishUniversity StudentsWorking Adults
C11
114 文
BAS Bootcamp: Day 6 Setting up IO Internally
Business EnglishUniversity StudentsWorking Adults
C13
47 文
What is APQP (Advanced Product Quality Planning)? 🚗 | Opexity
Business EnglishUniversity StudentsWorking Adults
このレッスンの語彙とスピーキングのポイント
このC1レベルのスピーキングレッスンは、動画「What is SMT (Surface Mount Technology)? PCB Assembly」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：component, Pcb, placement, board, solder。 この動画には、シャドーイング用の文が108文、単語が1290語あります。 音声の長さは10:18です。 話す速さは1分あたり約125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72%だけなので、語彙は難しめです。
この動画の重要語彙
動画の中で特に難しい単語15語を、発音と意味つきで紹介します。
| 単語 | 発音 | 意味 |
|---|---|---|
| solder 名詞 | /ˈsɒl.də(ɹ)/ | 半田 |
| pasta 名詞 | /ˈpɑ.stə/ | パスタ |
| stencil 名詞 | /ˈstɛnsəl/ | ステンシル, テンプレート |
| vacuum 名詞 | /ˈvæ.kjuːm/ | 真空 |
| squeegee 名詞 | /ˈskwiˌd͡ʒi/ | スクイージー, スキージー |
| nozzle 名詞 | /ˈnɒzəl/ | ノズル |
| shooter 名詞 | /ˈʃuːtəː/ | 射手 |
| automate 動詞 | /ˈɔ.təˌmeɪt/ | 自動化する |
| pad 名詞 | /pæd/ | パッド |
| aperture 名詞 | /ˈæp.ɚˌt͡ʃʊɹ/ | 隙間 |
| depict 動詞 | /dɪˈpɪkt/ | 描く |
| micron 名詞 | /ˈmaɪkɹɒn/ | ミクロン |
| defect 名詞 | /ˈdiːfɛkt/ | 欠陥, 欠点 |
| soda 名詞 | /ˈsoʊdə/ | ソーダ, 炭酸ナトリウム |
| revolver 名詞 | /ɹɪˈvɒl.vɚ/ | リボルバー |
動画に出てくる句動詞
| 単語 | 発音 | 意味 |
|---|---|---|
| check out 動詞 | 試験する, 検査する | |
| speed up 動詞 | /spiːdˈʌp/ | スピードを出す |
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 |
|---|---|
| 「used to」 used to + 動詞 — 今はもう違う過去の習慣や状態 | used to locate |
| 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 mounted · is soldered · has been designed |
| 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 | has become · has been designed · has completed |
注意したい発音
話し手はdon't, we're, we'llなど、短縮形や弱形を5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: shooter /ˈʃuːtəː/, fiducial /fəˈd(j)uːʃəl/, fiduciary /fəˈduːʃ.i.eɹ.i/, fabrication /fæbɹɪˈkeɪʃən/, measurable /ˈmɛʒəɹəbəl/
- 長い単語（アクセントの位置に注意）: fiduciary /fəˈduːʃ.i.eɹ.i/, fabrication /fæbɹɪˈkeɪʃən/, measurable /ˈmɛʒəɹəbəl/, simultaneous /ˌsaɪ̯.məlˈteɪ̯.ni.əs/, parameter /pəˈɹæm.ə.tɚ/
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: solder /ˈsɒl.də(ɹ)/, placer /ˈpleɪsə(ɹ)/, measurable /ˈmɛʒəɹəbəl/, revolver /ɹɪˈvɒl.vɚ/, reel /ˈɹiːl/
- /v/ — /b/ にならないように、上の歯を下唇に当てる: vacuum /ˈvæ.kjuːm/, revolver /ɹɪˈvɒl.vɚ/, scavenge /ˈskæv.ɪndʒ/, overhead /ˈəʊvəˌhɛd/
- /f/ — 「フ」ではなく、上の歯と下唇で出す: fiducial /fəˈd(j)uːʃəl/, fiduciary /fəˈduːʃ.i.eɹ.i/, defect /ˈdiːfɛkt/, fabrication /fæbɹɪˈkeɪʃən/, fillet /fɪˈleɪ/
この動画での練習方法
- 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。
- 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。
- 自分の声を録音して元の音声と比べます。solder, pasta, stencil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。