Regarding the point "through hole cover oil" and "through hole open window" (the usage of VIA and PAD), many customers and design engineers often ask what this means when ordering a system, which option should I choose for my files? The following is the explanation of this problem point:
Sometimes the conductive hole is treated with PAD attribute, and sometimes the key hole is treated with VIA attribute. The via attribute and pad attribute design are confused, which leads to wrong processing. This is also one of the problems frequently complained about. And for the circuit board production factory, in the processing of CAM data, some processing film engineers, because the customer design document is not standardized, and wrong, to help customers modify the document, the non-standard design to do right, with their own experience to process engineering data, so that led to and contributed to the customer's design is not standardized, Prinlin circuit hereby stated: Just because you did it right last time, doesn't mean your file is right! All engineers must pay attention to the design standards and specifications! Princetron will again strictly require all processing film engineers, as far as possible to maintain the status of customer documents! As far as possible to do according to the design specification and standard processing, not according to the so-called experience processing! Reflect the problem, so that you can design engineers do a reference, improve the quality of design and reduce the occurrence of problems!
This paper mainly explains conductive holes, key holes, and the connection between protel /pads/ and geber files Conductive holes: via key holes: pad is particularly prone to several problems: 1. pad is mixed with via, leading to problem 1. When your files are pads or protel, send them to the factory and ask for cover oil. Be aware that you need to carefully check if your pad is also using via, otherwise you will get green oil on your PAD and not be able to weld points: The plug-in hole must be sprayed with tin. Why did you cover the oil and how did I use it? Please check the file when saying this, whether it was designed by pad or via!
2. When your files are pads or protel, send the files to the factory, and the order requirement is through hole cover oil. Many customers use pad(plug-in holes) to represent conductive holes, thus causing your conductive holes to open the window. Then please check your document design!
Princ circuit at this point, again as follows, if you are via, press via, if you are pad, press pad! Because no one will know that yours is a conductive hole, that is a plug-in hole, and via and pad are the only identifiers, please be clear!
Two, via in the conversion process, because of the design is not standard or you are not clear on the conversion gerber setting rules, and cause problems when you send the gerber file the factory can not distinguish those are through the hole those are plug holes, the only can identify is according to the file processing, which helps the welding layer that there is a window! Points of contention: The gerber you sent out is just a film file. The factory has no way to check whether it is a conductive hole or a keyhole. Please check the gerber file to see if it is conducive to welding layer. Three, how to design holes in protel or pads cover oil! This is the most standard practice, if the design standard, it will not go wrong!
In protel, there is a tenting option in the via property. If you check it, it must be cover oil. Then what you turn out is all cover oil. When you output soldermask (solder layer), just check the soldermask top -- via below, which means all pass through the hole to open the window. If you do not check, pass through the hole cover oil. You have two choices via. If you provide the original file, you can choose when placing the order. If you provide the gerber file, please check whether the gerber file meets your requirements!