通讯模块 FS211/N
线路与图面(Pattern):线路是做为原件之间导通的工具,在设计上会另外设计大铜面作为接地及电源层。线路与图面是同时做出的。
介电层(Dielectric):用来保持线路及各层之间的绝缘性,俗称为基材。
孔(Throughhole/via):导通孔可使两层次以上的线路彼此导通,较大的导通孔则做为零件插件用,另外有非导通孔(nPTH)通常用来作为表面贴装定位,组装时固定螺丝用。
防焊油墨(Solderresistant/SolderMask):并非全部的铜面都要吃锡上零件,因此非吃锡的区域,会印一层隔绝铜面吃锡的物质(通常为环氧树脂),避免非吃锡的线路间短路。根据不同的工艺,分为绿油、红油、蓝油。
丝印(Legend/Marking/Silkscreen):此为非必要之构成,主要的功能是在电路板上标注各零件的名称、位置框,方便组装后维修及辨识用。
表面处理(SurfaceFinish):由于铜面在一般环境中,很容易氧化,导致无法上锡(焊锡性不良),因此会在要吃锡的铜面上进行保护。保护的方式有喷锡(HASL),化金(ENIG),化银(ImmersionSilver),化锡(ImmersionTIn),**保焊剂(OSP),方法各有优缺点,统称为表面处理。Ebara A30W Multi-Stage Dry Vacuum Pump 2273
Ebara A30W Multi-Stage Dry Vacuum Pump 20092
Ebara A30W Multi-Stage Dry Vacuum Pump 9008
Ebara A10S Multi-Stage Dry Vacuum Pump with 10071
Ebara A10S Multi-Stage Dry Vacuum Pump with 16581
T1000P Toyota VP210-00000 Dry Vacuum Pump 9633
Ebara A10S Multi-Stage Dry Vacuum Pump with 41186
Ebara A10S Multi-Stage Dry Vacuum Pump with 30634
Ebara A10S Multi-Stage Dry Vacuum Pump with 30997
Ebara A10S Multi-Stage Dry Vacuum Pump with 11581
Ebara A10S Multi-Stage Dry Vacuum Pump with 49499
Ebara A10S Multi-Stage Dry Vacuum Pump with 50538
Ebara A10S Multi-Stage Dry Vacuum Pump with 10552
Ebara A10S-S Multi-Stage Dry Vacuum Pump 10968
zma1122.cn.b2b168.com/m/