Cb manufacturers talk about the three via processing methods and differences of PCB

***Type of via cover oil. Via cover oil means that the solder ring of the via is not exposed and covered with ink. In order to avoid short circuits when the board is in use, the via cover oil is generally selected to ensure both The electrical performance is also avoided, and the risk of short circuit with other components during use is also avoided.

　　 The second type of via opening window, via opening window refers to the exposed surface of the solder ring of the via hole without ink. This processing method is similar to the processing method of the plug-in hole, and the plug-in hole is usually opened and tinned. Via window opening is generally performed when the designer has special requirements. If the surface treatment is tin spraying, the vias processed in this way can be soldered like patch pads.

The third type of via plug oil, via plug oil refers to filling the full hole of the via to plug the via hole, so that the oil on the solder mask will not flow into the via hole, and use it in the hole. The ink is plugged. A good standard for via plugging is that the via is opaque, and when viewed from one side of the hole, the other side cannot be seen through.

The difference between via cover oil and via plug oil: the via cover oil means that the welding ring of the via is covered with ink. The purpose of this is to cover the edge of the welding ring of the via with green oil. Hole plugging oil refers to filling all holes with ink to block the holes. Here, it means that the holes are filled with ink and are opaque.

The difference between the via cover oil and the via window: the via cover oil refers to the ink covering the welding ring of the via. The purpose here is that the edge of the welding ring of the hole is covered with green oil to insulate the green oil. effect. On the contrary, the via hole opening window is exposed on the solder ring of the via hole, and the ink is not covered. If the surface treatment is sprayed with tin, the solder ring here is similar to the tin on the patch pad, which can be used for soldering.

　　 The difference between via opening window and via plugging oil: one is that the via solder ring is exposed, and the via is exposed to light, and the other is that the via is all covered with ink, and the inside of the hole is also blocked by ink, making it opaque.