There are many vias on double-sided boards and multi-layer boards. Many board vias are handled differently. There are generally three types: via hole opening, via hole cap oil, and via hole plug oil. What is the difference between them? The following editor will introduce in detail.
The difference between circuit board via hole cover oil and via hole opening window:
1. Introduction of Via Window
Via opening means that the solder ring of the via hole is exposed and not covered with 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.
2. Introduction 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, which not only guarantees the electrical performance, but also avoids the use process. In the risk of short circuit with other components.
3. Introduction of via plug oil
Via plug oil means to plug the via hole with oil to plug the via hole, so that the oil on the solder mask will not flow into the via hole, and plug the hole with ink. 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.
4. The difference between via hole cover oil and via window opening
The via hole cover oil means that the welding ring of the via is covered with ink. The purpose here is that the edge of the hole welding ring is covered with green oil, which is green Oil insulation. On the contrary, the via hole opening window is exposed on the solder ring of the via hole and not covered with ink. 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.
5. The difference between via hole opening and via hole plugging oil
One is that the via hole solder ring is exposed, and the via hole is exposed to light, and the other is that the via hole is completely covered with ink, and the hole is also blocked by ink and is impenetrable. Light.