TWI428088B - Shield can and printting circuit board device - Google Patents

Description

Electromagnetic shield and printed circuit board device

The present invention relates to an electromagnetic shield and a printed circuit board device using the same.

In the electronic communication industry, in order to suppress the interference of electromagnetic waves transmitted through space to electronic components, or the electromagnetic waves emitted by the electronic components themselves interfere with other electronic components, generally, the electromagnetic shielding cover is fixed to the printed circuit board to be on the printed circuit board. The electronic components are shielded. The way in which the conventional electromagnetic shielding cover is fixed to the printed circuit board is to directly solder the electromagnetic shielding cover to the printed circuit board, or to first solder a plurality of fixing clips on the printed circuit board, so that the clamping port of the fixing clip faces upward, and the electromagnetic The shield is fixed by the clamping of the side wall of the fixing clip. However, the fixing manner of the electromagnetic shielding cover mentioned above may cause inconvenience in repairing or replacing components in the shielding cover, or the structure of the printed circuit board is complicated, and the manufacturing process is cumbersome.

In view of the above, it is necessary to provide an electromagnetic shield which is simple in structure and easy to be attached to a printed circuit board.

In addition, it is necessary to provide a printed circuit board device that is easy to manufacture.

An electromagnetic shielding cover for shielding electronic components on a printed circuit board, the sidewalls of the electromagnetic shielding cover are formed with a resisting edge and a holding edge spaced apart, and the resisting edge is pressed against the upper surface of the printed circuit board The hooking edge is used to pass through the printed circuit board The hole is such that the end of the hooking edge abuts against the lower surface of the printed circuit board.

A printed circuit board device includes an electromagnetic shielding cover and a printed circuit board, the electromagnetic shielding cover is formed with an abutting edge and a hooking edge, the hooking edge is hook-shaped, and comprises an elastically pressable hook Holding the arm, the printed circuit board has an upper surface and a lower surface, and the printed circuit board is provided with a through hole penetrating the upper and lower surfaces and corresponding to the hooking edge, and the electromagnetic shielding cover is mounted to a printed circuit board, the hooking edge passes through the through hole of the circuit board, so that the end of the hooking arm abuts against the lower surface of the printed circuit board, and the resisting edge is pressed against the upper surface of the printed circuit board, so that the circuit board is The holding edge and the hooking edge are clamped.

Compared with the prior art, the printed circuit board device has a simple structure, is convenient to manufacture, and is convenient for the electromagnetic shielding cover to be mounted. The electromagnetic shielding cover only needs to form a resisting edge and a hooking edge, and only a through hole is needed on the printed circuit board. Passing through the through hole through the hooking edge, so that the end of the hooking arm abuts against the lower surface of the printed circuit board, and the resisting edge is pressed against the upper surface of the printed circuit board, so that the electromagnetic shielding cover is fixed on the printed circuit board When the electromagnetic shielding cover needs to be removed, simply press the hooking arm to make the hooking edge exit the through hole.

100‧‧‧Printed circuit board assembly

10‧‧‧Electromagnetic shield

12‧‧‧ top wall

122‧‧‧ vents

14‧‧‧ side wall

16‧‧‧Resistance

162‧‧‧ convex hull

18‧‧‧ affiliation

182‧‧‧Extension arm

184‧‧‧Holding arms

20‧‧‧Printed circuit board

21‧‧‧ upper surface

212‧‧‧Electronic components

22‧‧‧through hole

23‧‧‧ Lower surface

24‧‧‧ recess

25‧‧‧Conductive circuit

1 is an exploded perspective view of a printed circuit board device according to a preferred embodiment of the present invention; FIG. 2 is another perspective view of the electromagnetic shield of the printed circuit board device shown in FIG. 1; FIG. 3 is a printed circuit board shown in FIG. A schematic cross-sectional view of the device after assembly.

Referring to FIG. 1 and FIG. 2, a printed circuit board device 100 according to a preferred embodiment of the present invention includes an electromagnetic shielding cover 10 and a printed circuit board 20, and the electromagnetic shielding cover 10 is detachably mounted. Mounted on the printed circuit board 20 to shield the electronic components of the printed circuit board 20.

The electromagnetic shielding cover 10 includes a top wall 12, a plurality of side walls 14 formed at the edge of the top wall 12 and bent downward, and a plurality of abutting edges 16 and a plurality of hooking edges 18 extending at the bottom of the side walls 14 and spaced apart from each other. .

In this embodiment, the top wall 12 has a rectangular shape, and correspondingly four side walls 14 are formed at the edges thereof. A plurality of heat dissipation holes 122 are defined in the top wall 12 for dissipating heat from the electronic components shielded in the electromagnetic shielding cover 10. Each of the side walls 14 is substantially bent downwardly perpendicular to the top wall 12. Each of the abutting edges 16 has a plate shape extending outward from the bottom of the side wall 14 and parallel to the top wall 12 for resisting the upper surface of the printed circuit board 20 after assembly. A plurality of convex hulls 162 are formed on the resisting edge 16, and the convex hulls 162 are protruded from the lower surface of the resisting edge 16 and can be formed on the upper surface of the stamping resisting edge 16 for forming electricity with the printed circuit board 20. Sexual communication. The hooking edge 18 has a hook shape and includes an extending arm 182 and a hooking arm 184. The extension arm 182 extends downward along the side wall 14 at the bottom of the side wall 14. The extension arm 182 has a length greater than the thickness of the printed circuit board 20. The hooking arm 184 is bent upwardly to the end of the extending arm 182, forming an angle with the extending arm 182, and extending upwardly less than the length of the extending arm 182. The hooking arm 184 has a certain elasticity and can be pressed against the extending arm 182, that is, the hooking arm 184 can be pressed to the extending arm 182 under the action of an external force, and after the external force is removed, The hooking arm 184 is returned to the original state with respect to the extension arm 182.

The printed circuit board 20 has an upper surface 21 and an opposite lower surface 23. A plurality of electronic components 212 are disposed on the upper surface 21, and the electronic components 212 need to be shielded by the electromagnetic shield 10 in order to avoid electromagnetic interference. The printed circuit board 20 is provided with a plurality of through holes 22 penetrating through the upper surface 21 and the lower surface 23 and at a position The hooking edge 18 corresponds to allow the hooking edge 18 to pass through so that the electromagnetic shield 10 is hooked on the printed circuit board 20. Each of the through holes 22 is a rectangular hole having a small hole width, so that when the hooking edge 18 passes through the through hole 22, the hooking arm 184 needs to be pressed against the extending arm 182 and the angle is reduced to pass. The printed circuit board 20 is further formed with a plurality of recesses 24 for engaging the convex hulls 162 on the resisting edges 16, so that the resisting edges 16 are more stable against the printed circuit board 20. At the same time, a solder joint (not shown) is formed in each of the recesses 24 for resisting the convex hull 162 such that the convex hull 162 forms an electrically conductive connection with the solder joint. The solder joints in the plurality of recesses 24 are electrically connected through a conductive circuit 25, and the conductive circuit 25 is connected to a ground circuit (not shown) on the printed circuit board 20, so that the electromagnetic shield 10 and the ground circuit are electrically connected. The conduction is such that the static electricity formed on the electromagnetic shield 10 can be removed in time.

When the printed circuit board device 100 is assembled, the electromagnetic shielding cover 10 is placed on the printed circuit board 20 such that the hooking edge 18 is correspondingly inserted into the through hole 22; then the electromagnetic shielding cover 10 is pressed down. The hooking arm 184 of the hooking edge 18 is elastically pressed against the extending arm 182 and passes through the through hole 22, and then the hooking arm 184 is unfolded, and the end of the hooking arm 184 and the printed circuit board 20 are The lower surface 23 abuts. At this time, the resisting edge 16 is pressed against the upper surface 21 of the printed circuit board 20 , and the convex hull 162 on the resisting edge 16 is correspondingly received in the recess 24 and abuts against the solder joint in the recess 24 . Thus, the printed circuit board 20 is clamped by the retaining edge 16 and the hooking arm 184 of the hooking edge 18, and the electromagnetic shield 10 can be stably mounted on the printed circuit board 20, and the electronic component 212 is shielded. .

When the electromagnetic shielding cover 10 needs to be disassembled, only the hooking arm 184 needs to be pressed, so that the angle between the hooking arm 184 and the extending arm 182 becomes smaller, and the hooking edge 18 is pushed upwards, so that the hooking edge 18 can pass through. The hole 22 is withdrawn, so that the electromagnetic shield 10 can be easily removed .

In summary, the printed circuit board device has a simple structure, is convenient to manufacture, and is convenient for the electromagnetic shield cover to be taken. A through hole is formed in the printed circuit board by forming a resisting edge and a hooking edge on the electromagnetic shielding cover, and the hooking edge passes through the through hole, so that the end of the hooking arm abuts against the lower surface of the printed circuit board, The resisting edge is pressed against the upper surface of the printed circuit board, and thus the electromagnetic shield is fixed on the printed circuit board. When the electromagnetic shielding cover needs to be removed, it is only necessary to press the hooking arm to make the hooking edge exit the through hole.

100‧‧‧Printed circuit board assembly

10‧‧‧Electromagnetic shield

12‧‧‧ top wall

122‧‧‧ vents

14‧‧‧ side wall

16‧‧‧Resistance

162‧‧‧ convex hull

18‧‧‧ affiliation

182‧‧‧Extension arm

184‧‧‧Holding arms

20‧‧‧Printed circuit board

21‧‧‧ upper surface

212‧‧‧Electronic components

22‧‧‧through hole

23‧‧‧ Lower surface

24‧‧‧ recess

25‧‧‧Conductive circuit

Claims (8)

An electromagnetic shielding cover for shielding electronic components on a printed circuit board, wherein the electromagnetic shielding cover is formed with a resisting edge and a hooking edge for pressing against an upper surface of the printed circuit board. The hooking edge is configured to pass through the through hole of the printed circuit board, so that the end of the hooking edge abuts against the lower surface of the printed circuit board, and the lower surface of the resisting edge is formed with a plurality of convex hulls for Holding the printed circuit board. The electromagnetic shielding cover of claim 1, wherein the electromagnetic shielding cover comprises a top wall, a plurality of side walls formed at an edge of the top wall and bent downward, the abutting edge and the hooking edge extending at The bottom of the side walls are spaced apart. The electromagnetic shield of claim 2, wherein the abutting edge has a plate shape extending outward from the bottom of the side wall and parallel to the top wall. The electromagnetic shielding cover of claim 1, wherein the hooking edge is hook-shaped, and comprises an extending arm and a hooking arm, the extending arm extending downward along a bottom of the side wall, the hook The holding arm is bent upwardly to the end of the extension arm and forms an angle with the extension arm. The hooking wall has elasticity and can be pressed against the extension arm. A printed circuit board device comprising an electromagnetic shielding cover and a printed circuit board, wherein the electromagnetic shielding cover is formed with a resisting edge and a hooking edge, the hooking edge is hook-shaped, and comprises an elastic Pressing the hooking arm, the printed circuit board has an upper surface and an opposite lower surface, and the printed circuit board is provided with a through hole penetrating the upper and lower surfaces and corresponding to the hooking edge, and the mounting Electromagnetic shielding cover to the printed circuit board, the hooking edge passes through the through hole of the circuit board, so that the end of the hooking arm abuts against the lower surface of the printed circuit board, and the resisting edge is pressed against the upper surface of the printed circuit board, thereby the circuit The plate is sandwiched by the abutting edge and the hooking edge, and a plurality of convex hulls are formed on the lower surface of the resisting edge, and the printed circuit board is formed with a corresponding convex hull Concave. The printed circuit board device of claim 5, wherein a solder joint is formed in each of the recesses, and the solder joint abuts against the convex hull, so that the convex hull and the solder joint form an electrically conductive connection. The solder joints in the plurality of recesses are electrically conducted through a conductive circuit, and the conductive circuit is connected to the ground circuit on the printed circuit board. The printed circuit board device of claim 5, wherein the electromagnetic shielding cover comprises a top wall, a plurality of side walls formed at an edge of the top wall and bent downward, the resisting edge and the hooking edge extending Arranged at the bottom of the side walls and spaced apart, the abutting edges extend toward the outside and are parallel to the top wall. The printed circuit board device of claim 7, wherein the hooking edge is hook-shaped, and includes an extending arm extending downward along a bottom of the side wall, the hooking arm facing outward Attached to the end of the extension arm in an upwardly bent manner, forming an angle with the extension arm.