When the
PCB circuit board opens the window to make the circuit layer, the windowing on the positive film is the part that needs to be retained. If it's a negative film, the window on the film is the part that needs to be removed.
The circuit board opens the window is the resistance welding opens the window, namely does not cover the solder resist layer the meaning. Layer windowing is the top solder layer (or bottom solder layer), in need of a copper-clad tool to drag out the corresponding graphics on it, although also with copper-clad tools, but not copper-clad, it just means that the part of the ring does not resist welding, no network concept. 1) Top solder is a soldering layer, that is, where there is no green oil, if there is a line on the place sprayed tin, there is no line on the place is the light plate, usually this layer with the line layer, can be used as tin treatment. 2) top paster is a steel mesh layer, which is made of steel mesh factory.
PCB circuit board industry has many windows in many processes, it is only a professional term in this industry.
Including: line window: that is, when making line layer, the film on the window is the need to retain the part. If it's a negative film, the window on the film is the part that needs to be removed.
Weld-proof window opening: Film window opening method, the need to weld or heat dissipation of PAD exposed outside the green oil layer, in order to achieve customer needs.
And text windows.
"Open the window" is to dig a hole. There is no solder mask in that place, exposing the copper foil underneath. Because the solder mask is there will be no graphics, so filling is "window opening".
Welding resistance window refers to the need to weld the position exposed to the size of copper, that is, the size of the non-covered ink part, the cover line refers to the size and number of oil covered the circuit part. The distance between the lid lines is too small to cause dew lines in the production process.
1. aperture window opening: because there are many customers do not need ink plug hole, if not open the window, ink will enter the hole. (this is for small holes) if the big hole plugs into the ink, the customer can't get on the key. In addition, if it is a gold plate, it must also open windows.
2.PAD (copper) windows: customers need welding, surface treatment (gold / tin spray, etc.).
