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孔内气泡可能性不大,因為此孔型不易形成。可檢查化銅段狀況!
树脂残留可能性大。鐳射條件,DESMEAR 條件,表面處理之黑棕化會對鐳射能量有影響!
It should be smear, which kind of the laser drill. UV +CO2 or UV ?
From the pic, I think the via was drilled by UV.
You can adjust the laser energy.and the shape of the via is not good.
which cann't pass the reliability test.
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