Card Edge connector is computer hardware, such as between the memory module and the memory socket, and between the graphics card and the graphics card socket. All signals are transmitted through Card Edge connector. Card Edge connector is composed of many golden yellow conductive contacts. Because its surface is plated with gold and the conductive contacts are arranged like fingers, it is called "golden finger". The gold finger is actually coated with a layer of gold on the copper clad laminate through the electroplating process, because the gold has strong oxidation resistance, can protect the internal circuit from corrosion, and has strong conductivity, and will not cause signal loss. At the same time, the gold has very strong ductility, which can make the contact area between contacts larger under appropriate pressure, so as to reduce the contact resistance and improve the signal transmission efficiency. Because the coating thickness is only a few tens of microns, it is very easy to wear. Therefore, it should be avoided to insert and unplug the original with Card Edge connector under unnecessary conditions to prolong the service life.All data streams and electronic streams of the memory processing unit are exchanged with the PC system through the contact between Card Edge connector and the memory socket. It is the output and input port of the memory. Therefore, its manufacturing process is very important for the memory connection.