The basic material is rigid copper-clad plate, and the surface wiring material is copper foil. The brown or green part of the circuit board is solder resistance paint, which is an insulating protective layer to protect the copper wire.
In addition, the resistance inside the phone is the most used component of all electronic circuits. Resistance is divided into many kinds, the common resistance of the mobile phone is jumper resistance, thermistor, varistor, the common material is carbon and metal conductive material.
Another important material for mobile phones is electromagnetic shielding material. In view of the increasing requirements of electromagnetic compatibility (emc) of industrial products, electromagnetic shielding technology is particularly important. The commonly used electromagnetic shielding materials are conductive rubber, conductive cloth, conductive foam, conductive cloth tape, beryllium bronze finger reed, metal mesh wire shielding strip, conductive coating, microwave absorption material.