Hardware communicates with you on the impact analysis of the design of the white copper screen cover motherboard

As we know before, a shielding cover that affects the shielding effect, it is best to achieve its shielding effect before designing. As for a nickel-nickel alloy shield, what design details should we pay attention to when designing? 1. After other design standards of the nickel silver shielding cover are flattened, the width of the punching area is 0.5mm; the width of the shielding cover pad is between 0.7~1.0mm, too small is not conducive to the patch, and too large is easy to be interfered by the outside; 2. Direct The height of floating tin is 0.1mm in SMT, and the flatness of lid is 0.1mm. 3. After the shielding cover is assembled, the gap between the upper device or the shell should be at least 0.2mm; 4. The center of gravity of the shielding bracket should be pre-designed with a suction cup area of u200bu200b5mm in diameter, and there should be 1 or 2 on each side of the surrounding wall with a diameter of 0.7~1.0mm Through hole, used for card shielding cover. The card hole should not be too many, otherwise it is difficult to disassemble, it can be made by the supplier, and the design gives the position and size; 5. The bottom surface of the wall around the shielding cover should be 0.5mm away from the PCB to prevent the shielding bracket from eating too much tin to withstand it Shield cover. The diameter of the heat dissipation hole of the shielding cover is 1mm; if the shielding cover or the shielding bracket has a flat drop, pay attention to the cut through the side of the drop boundary, otherwise it cannot be processed. In addition, a hole with a diameter of 3mm should be punched at the corner of the drop in the plane, otherwise it will tear; 6. If The shielding cover or shielding bracket has a plane drop, pay attention to the drop angle of 35~40° (too big angles are broken when processing), the gap between the bracket and the cover surface at the drop is not 0, should be 0.1mm; the shield is directly cut out in the plane The distance from the outer wall of the side wall should be more than 1mm. If there is a downward bending inside, the side wall of the bend is 0.5mm away from the outer wall. At this time, the plane is directly attached to the side wall and cut; the shielding directly cuts the inner corner R0.5mm; the shielding bracket and The PCBs are not welded on the entire surface. The 2-1-2mm method of Great Wall pin welding should be used, with 2mm contact and 1mm hanging for easy tin climbing, which can increase the adhesion strength of the shielding cover. Knowing these, in the design, in the actual shielding performance of the nickel silver shield, it will bring about the results that affect the benign results. If you need to know about other shielding covers, please add Xiaoshuo's WeChat ID: