protel99se help中:
1.working in PCB documents>>pcb design objects,中有这样一句话:Keep in mind that most objects placed on a PCB document will define copper areas or voids in the physical PCB. This applies to both electrical objects, such as tracks and pads, and non-electrical objects, such as text and dimensioning。不解。。。文字注释为什么用copper呀?
2.working in PCB documents>>pcb design objects>>PCB solder mask layer中有这样一句话:pads or other objects placed on these layers represent voids in the copper.不解。。。这层是绿漆,和copper也无关吧?