Flex PCB project mein kai baar nuksan material cost se nahi, balki visible defect ko der se pakadne se hota hai. Ek solder bridge, reverse polarity ya coverlay shift prototype aur pilot build ko turant rework aur delay ki taraf le ja sakta hai.
Isliye buyer aur SQE ke liye sahi sawal yeh nahi hai ki supplier ke paas AOI machine hai ya nahi. Sahi sawal yeh hai ki AOI kis process gate par chalti hai, flex circuit ko kaise support kiya jata hai, aur kab electrical test ya X-ray jodna zaruri hota hai.
"AOI tabhi value create karti hai jab defect ko mehenga hone se pehle roka jaye. Sirf machine hona process control nahi hota."
— Hommer Zhao, Engineering Director at FlexiPCB
AOI asal mein kya karti hai
AOI panel ya assembly ki real image ko digital reference se compare karti hai. Flex PCB par yeh opens, shorts, missing component, polarity error, rotation, visible solder bridge aur coverlay ya stiffener registration issue jaise defects ko achchhi tarah pakadti hai. Lekin yeh 100% electrical continuity prove nahi karti aur hidden joints ko bharosemand tarike se nahi dekh pati.
Process mein AOI kahan fit hoti hai
Sabse strong flow AOI ko bare flex etching ke baad, SMT placement ke baad aur reflow ke baad lagata hai. Flex circuit mein mechanical support bahut critical hota hai; agar board stable nahi hai to false call badh jate hain. Zyada context ke liye flex PCB manufacturing process guide aur reliability testing guide bhi dekhiye.
| Defect / condition | AOI result | Extra method |
|---|---|---|
| Trace open / nick | Strong on bare flex | Flying probe confirms continuity |
| Copper short / spacing issue | Strong on bare flex | Electrical test for full coverage |
| Missing or wrong component | Strong on assembly | Usually no extra method |
| Visible solder bridge | Strong on assembly | Electrical test still recommended |
| Hidden joint under BGA/QFN | Weak | X-ray |
| Coverlay or stiffener misregistration | Strong to moderate | Dimensional check when tolerance is tight |
AOI kab enough nahi hoti
Agar product mein BGA, QFN, hidden joints ya high reliability requirement hai, to AOI akeli kafi nahi hoti. Aise cases mein AOI ke saath electrical test aur kai baar X-ray bhi zaruri hota hai.
Quote se pehle kya bhejna chahiye
- Gerber ya ODB++, assembly drawing aur stackup
- MPN aur package type ke saath BOM
- Centroid file
- Prototype, pilot aur production quantity
- Bend zones, stiffeners, unsupported tails aur ZIF thickness target
- Use environment, target lead time aur compliance target
In data ke saath supplier quote stage par hi sahi inspection plan define kar sakta hai.
FAQ
Kya AOI har flex assembly ke liye enough hai?
Nahi. Visible defects ke liye strong hai, lekin electrical test ko replace nahi karti.
Kya bare flex par bhi AOI hoti hai?
Haan, aur yeh early-stage gate bahut useful hota hai.
Flex PCB par false calls zyada kyon aate hain?
Geometry kam stable hoti hai, local warpage hota hai aur optical variation bhi hota hai.
X-ray kab demand karna chahiye?
Jab hidden joints, BGA, QFN ya camera-se-na-dikhne wali structures hon.
Buyer ki sabse common galti kya hoti hai?
Yeh poochna ki AOI hai ya nahi, lekin yeh na poochna ki AOI product-specific flow mein kaise use hoti hai.
Agla step
Agar aap naya program launch kar rahe hain, to drawing, BOM, quantity, environment, target lead time aur compliance target bhejiye. Saath hi batayein ki AOI, flying probe, X-ray, FAI ya traceability chahiye ya nahi. Hum DFM feedback, inspection plan aur quote bhejenge. Quote request karein ya engineering team se contact karein.
