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Generally, regarding the "via cap oil" and "via opening window" in PCB circuit board design (the distinction between VIA and PAD), many customers and design engineers often don't know how to choose when placing orders in the system. Which option should I choose for my file? Here is an explanation of this problem as follows:
I often encounter such problems. The PCB design is seriously non-standard, and it is impossible to distinguish between the pad and the usage of via. Sometimes the conductive hole is processed by the attribute of the pad, and sometimes the key hole is processed by the attribute of the via. The design of VIA attributes and PAD attributes is confusing, which leads to incorrect processing. This is also one of the frequent complaints. For circuit board production plants, when processing CAM data, some processing film engineers, because the customer’s design documents are not standardized, and Make mistakes, help customers revise documents, make irregular designs right, and deal with engineering data based on their own experience,
which has led to and contributed to the irregular design of customers. Hereby, it is hereby explained: the last time you did the right thing, no Your file is correct! All engineers must pay attention to design standards and specifications. Keep the current status of customer documents as much as possible! Try to deal with the design specifications and standards as much as possible, not according to the so-called experience! The problem can be reflected, so that you can be a reference for the design engineers to improve the design quality and reduce the occurrence of problems!
This article mainly explains the conductive hole, the key hole, and the connection between the protel /pads/ and the geber file. The conductive hole: via key hole: pad is particularly prone to several problems: 1. Pad and via are mixed together, resulting in Problem 1. When the file is pads or protel, it is sent to the factory. It requires via hole cover oil. Please pay attention to carefully check whether the plug-in hole (pad) is also available with via, otherwise the plug-in hole will also be used. Putting green oil on it leads to the inability to solder. Disputes: The plug hole must be sprayed with tin on it. How do I cover the oil? How do I use it? Please check the file when you say this, whether it is a pad design or a via design!
When the file is pads or protel, send the file to the factory. The order requirement is via hole cover oil. Many customers use pads (plug-in holes) to indicate conductive holes, which causes the conductive holes to open windows. What you may want is Via hole cover oil, the point of dispute at that time is that what I want is conductive hole cover oil. Why is the window opened? Please check and confirm the design again.
Again, in the printed circuit board design, if it’s via, then press via, if it’s a pad, then press the pad! Because no one knows which conductive hole is in the design and which is the plug-in hole, and the only difference between via and pad is Logo, please be clear!
There is a tenting option in the via attribute in Protel. If you check it, it must be covered with oil. Then all the transferred files are covered with oil. In pads, when you transfer files from pads, you need to think about the method of covering oil through holes (via): When outputting the soldermask, that is, the solder mask, just check the solder mask top-the via below represents all vias and open windows. If you don’t check it, the vias are capped. Summarize: Press the pad to do it, this is the plug-in hole. Via you have two options. If you provide the original file, you can choose when you place the order. If you provide the gerber file, please check whether the gerber file meets the requirements!
During the via conversion process, due to the non-standard PCB design or the unclear conversion gerber setting rules, the problem is caused. When the gerber file is sent, the factory manufacturer cannot tell which are vias and those are keyholes, which are the only ones. What can be recognized is to process according to the file. If there is a solder layer, then there will be a window! Dispute point: I want the via to be covered with oil. Now the window is opened for me, which may cause a short circuit. Then please check the file. Gerber is the film. File, the factory has no way to check whether it is a conductive hole or a key hole. Please check the gerber file to see if there is a soldering layer. If there is a solder layer, open the window, if not, cover it with oil. 3. How to design it in protel or pads Hole cover oil! This is the most standard practice, if the design is standard, there will be no mistakes!
