Shielding cover and circuit board fixing structure
A technology of fixed structure and circuit board, applied in the direction of magnetic field/electric field shielding, electrical components, etc., can solve the problems of interference-sensitive circuits, the shielding cover cannot achieve the expected shielding effect, etc., to achieve the effect of preventing electromagnetic wave interference
Inactive Publication Date: 2018-02-02
NANNING FUGUI PRECISION IND CO LTD
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AI Technical Summary
Problems solved by technology
In this design, since the shielding cover is only connected to the surface of the circuit board, the shielding cover can only shield the electromagnetic interference on the surface of the circuit board.
However, external interference energy can still enter the circuit board from the side of the circuit board through the gap between the inner layer of the circuit board and interfere with the sensitive circuit, so that the shielding cover cannot achieve the expected shielding effect
Method used
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Embodiment Construction
[0029] refer to figure 1 , figure 2 and image 3 , The shielding case and the circuit board fixing structure 100 provided in a specific embodiment of the present invention is used to fix the shielding case 3 on the circuit board 1 .
[0030] In this embodiment, the circuit board 1 is a four-layer circuit board including a first signal layer 111 , a ground layer 13 , a power layer 19 and a second signal layer 171 .
[0031] In other embodiments, the number of layers of the circuit board 1 can also be set according to the performance requirements of the product, for example, six layers, eight layers or other layers. A plurality of signal layers, a plurality of ground layers and a plurality of power layers can be arranged in the circuit board 1, such as Figure 4 As shown, the circuit board is a six-layer circuit board, including a first signal layer 111 disposed on the first surface 11, a second signal layer 171 disposed on the second surface 17, and a two-layer ground layer...
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A shielding cover and circuit board fixing structure provided by the present invention includes a circuit board and a shielding cover, the circuit board includes a sensitive circuit and a grounding layer, the circuit board is provided with a groove, the groove communicates with the grounding layer, and the shielding cover covers the sensitive circuit and extend into the groove of the circuit board to be electrically connected to the ground layer. The shielding cover and circuit board fixing structure can effectively prevent electromagnetic waves from entering the circuit board from the side of the circuit board through the gap between inner layers of the circuit board and interfering with sensitive circuits.
Description
technical field [0001] The invention relates to a structure for preventing electromagnetic interference, in particular to a structure for fixing a shielding case and a circuit board. Background technique [0002] The application of electronic products is more and more extensive, and as one of the important components of electronic products, the design of circuit boards is particularly important. A large number of electronic components are arranged on the circuit board, and some electronic components are sensitive circuits. When these electronic components are working, electromagnetic waves generated outside will affect the normal operation of the electronic components. In the prior art, a shielding cover is usually provided at the sensitive circuit to shield the interference of the sensitive circuit from external electromagnetic waves, and at the same time prevent the electromagnetic wave generated by the sensitive circuit from radiating outward. The shielding case is usual...
Claims
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IPC IPC(8): H05K9/00
Inventor 何裕华
Owner NANNING FUGUI PRECISION IND CO LTD