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yl发现新技术:优化钢网开口,缩小接地焊盘开口,验证如下(原始钢网开口:外排引脚尺寸:0.55*0.20mm,内排引脚尺寸:0.50*0.20mm,接地焊盘5*5圆形开口,直径0.80mm):①一次优化:外排引脚开口不变,内排引脚尺寸:0.50*0.19mm,接地焊盘4*4圆形开口,直径0.80mm,炉后不良由45%降至12%; .. (2018-10-22 15:25)
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