PCB的各层定义及描述2018-06-14 09:59·电子工程师笔记1、TOP LAYER（顶层布线层）：设计为顶层铜箔走线。如为单面板则没有该层。2、BOMTTOM LAYER（底层布线层）：设计为底层铜箔走线。3、TOP/BOTTOM SOLDER（顶层/底层阻焊绿油层）：顶层/底层敷设阻焊绿油，以防止铜箔上锡，保持绝缘。在焊盘、过孔及本层非电气走线处阻焊绿油开窗。焊盘在设计中默认会开窗（OVERRIDE：0.1016mm），即焊盘露铜箔，外扩0.1016mm，波峰焊时会上锡。建议不做设计变动，以保证可焊性；过孔在设计中默认会开窗（OVERRIDE：0.1016mm），即过孔露铜箔，外扩0.1016mm，波峰焊时会上锡。如果设计为防止过孔上锡，不要露铜，则必须将过孔的附加属性SOLDER MASK（阻焊开窗）中的PENTING选项打勾选中，则关闭过孔开窗。另外本层也可单独进行非电气走线，则阻焊绿油相应开窗。如果是在铜箔走线上面，则用于增强走线过电流能力，焊接时加锡处理；如果是在非铜箔走线上面，一般设计用于做标识和特殊字符丝印，可省掉制作字符丝印层。4、TOP/BOTTOM PASTE（顶层/底层锡膏层）：该层一般用于贴片元件的SMT回流焊过程时上锡膏，和印制板厂家制板没有关系，导出GERBER时可删除，PCB设计时保持默认即可。5、TOP/BOTTOM OVERLAY（顶层/底层丝印层）：设计为各种丝印标识，如元件位号、字符、商标等。6、MECHANICAL LAYERS（机械层）：设计为PCB机械外形，默认LAYER1为外形层。其它LAYER2/3/4等可作为机械尺寸标注或者特殊用途，如某些板子需要制作导电碳油时可以使用LAYER2/3/4等，但是必须在同层标识清楚该层的用途。7、KEEPOUT LAYER（禁止布线层）：设计为禁止布线层，很多设计师也使用做PCB机械外形，如果PCB上同时有KEEPOUT和MECHANICAL LAYER1，则主要看这两层的外形完整度，一般以MECHANICAL LAYER1为准。建议设计时尽量使用MECHANICAL LAYER1作为外形层，如果使用KEEPOUT LAYER作为外形，则不要再使用MECHANICAL LAYER1，避免混淆！8、MIDLAYERS（中间信号层）：多用于多层板，我司设计很少使用。也可作为特殊用途层，但是必须在同层标识清楚该层的用途。9、INTERNAL PLANES（内电层）：用于多层板，我司设计没有使用。10、MULTI LAYER（通孔层）：通孔焊盘层。11、DRILL GUIDE（钻孔定位层）：焊盘及过孔的钻孔的中心定位坐标层。12、DRILL DRAWING（钻孔描述层）：焊盘及过孔的钻孔孔径尺寸描述层。
2024年12月26日，他喜欢薛芳菲，但是比起前途和家人，这份喜欢根本不值一提。
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八、张久礼烧鸡——匠心独运味蕾的极致礼赞
688299 长阳科技 -113.27 -3.14 3.36 1.06只不过格瑞维亚造型更年轻化运动化一些。
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道指涨354.09点，涨幅为1.01%，报35419.71点；纳指涨25.22点，涨幅为0.18%，报13934.46点；标普500指数涨28.86点，涨幅为0.64%，报4506.89点。1966年温碧霞出生于香港调景岭一个穷的揭不开锅的家庭，家中加上父母和兄弟姊妹一共有十口人。...观看破除》刑侦剧-4碍手机免费在线观看-环球文化影院
继昨日大涨后今天早盘中国电信低开高走截至上午收盘中国电信报5.8元涨10.06%封单超过130万手另外两大通信巨头同步大涨中国联通涨5.94%中国移动涨4.64%中国移动最新市值已经超过1.1万亿元
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