PCB, PCB mounting box, case assembly, and case

A case assembly, comprising:

• a PCB and a mounting box, wherein
• the PCB includes a PCB body and a grounding region on a side surface of the PCB body, the grounding region being connected to a GND network in the PCB body, wherein the grounding region is connected to a GND network in the PCB body, the GND network in the PCB body is wirings for grounding in a wiring layer of the PCB, and the grounding region is a metal plate formed by the GND network in the PCB body extending to the side surface of the PCB body;
• wherein the PCB mounting box includes a cuboid mounting box body having an opening on one side, and a grounding plate placed over the opening of the mounting box body, a fixing assembly being disposed around the opening of the mounting box body, through which the mounting box body is fixed to the grounding plate, a guide groove for fixing the PCB being further provided on an inner wall of the mounting box body in a direction perpendicular to the opening, and a conductive component in contact with the grounding region of the PCB being provided inside the grounding plate;
• and
• wherein the PCB is mounted into a guide groove in the mounting box;
• and the grounding region of the PCB is in contact with the conductive component inside the grounding plate.