Shielding device of portable DVD player and complete machine having the same

[0024] (Example 1 Circuit board shielding device of portable DVD player)

[0025] see figure 1 The circuit board shielding device 3 includes a circuit board 32, an upper cover 31, a base 33, a polycarbonate sheet 34 and screws 35; the circuit board 32 is located between the upper cover 31 and the base 33; the polycarbonate sheet 34 is lined on the upper cover Between 31 and the circuit board 32, to prevent the upper cover 31 from contacting the conductive elements on the circuit board 32, for the same reason, the polycarbonate sheet 34 can also be used between the circuit board 32 and the base 33; the screw 35 connects the upper cover 31 and circuit board 32 ground. see figure 2 , The upper cover 31 of the circuit board shielding device 3 is a steel stamping piece, with a flat surface and a vertical side extending downward from the edge of the flat surface. The lower edge of the side has an outwardly protruding convex strip 31-3 (see image 3 ), used to buckle with the base 33, the convex strip 31-3 is also integrally stamped and formed by the side; the plane part of the upper cover 31 is provided with a threaded hole 31-1 for mounting the screw 35, so that the upper cover and the circuit board 32 Threaded hole 32-1 is also provided in the corresponding position of the host circuit board. The threaded hole 31-1 can also be set on the base 33, and the mounting screw 35 makes the base and the host circuit board 32 The ground wire of the upper cover 31 and the base 33 can also be connected to ground; the flat part of the upper cover 3 is also opened with evenly distributed circular heat dissipation holes 31-2, the purpose is to accelerate the heat dissipation of the circuit board 32; the upper cover 31 side There are irregular notches 31-4 on the side, which is convenient for accommodating the electronic components on the circuit board 32 when it is matched and installed.

[0026] see Figure 4 The general shape of the base 33 of the circuit board shielding device 3 is the same as that of the upper cover 31, which is a steel stamping piece. The plane part of the base 33 is provided with a circular heat dissipation hole 33-2, which corresponds to the upper cover 31, which has an inward protrusion at the lower edge of its side. Of the convex strip 33-3 (see Figure 5 ), can be buckled with the protruding strip 31-3 of the upper cover 31 and make the buckling portion of the upper cover 31 and the base 33 close contact under the action of elastic force.

[0027] It should be noted that during installation and use, there are many gaps on the side of the shielding device. That is the gap between the upper cover and the side of the base. It should be carefully sealed with conductive tape to minimize the leakage to enhance the shielding effect.

[0028] (Embodiment 2 Portable DVD video disc player with the above-mentioned circuit board shielding device)