WO2018099170A1

WO2018099170A1 - Electrostatic shielding device

Info

Publication number: WO2018099170A1
Application number: PCT/CN2017/103462
Authority: WO
Inventors: 王玉龙
Original assignee: 广州视源电子科技股份有限公司; 广州视睿电子科技有限公司
Priority date: 2016-11-30
Filing date: 2017-09-26
Publication date: 2018-06-07
Also published as: CN206251571U

Abstract

Disclosed is an electrostatic shielding device, comprising a first shielding cover and a second shielding cover. An accommodation cavity is defined by matching the first shielding cover with the second shielding cover. The accommodation cavity is provided with a circuit board. The first shielding cover is provided with a connecting member in fit connection with the second shielding cover. A first conductive layer is covered on the connecting member, and is connected with a grounding position of the circuit board. When entering the gap where the first shielding cover is connected with the second shielding cover, static electricity is attracted by the first conductive layer, to form a current thereon, and the current then flows into the grounding position of the circuit board to prevent the static electricity from entering the accommodation cavity and contacting with an important circuit on the circuit board to cause breakdown of the circuit board. The electrostatic shielding device has a good shielding effect.

Description

Electrostatic shielding device

Technical field

The present invention relates to electronic equipment accessories, and more particularly to an electrostatic shielding device.

Background technique

With the continuous advancement of technology and the needs of the market, electronic products are constantly moving toward thinner and lighter, and the size of circuit boards, which are one of the important components of electronic products, is also decreasing. In order to prevent the circuit board from being disturbed by static electricity, the upper and lower covers are generally used to form a shielding cover to cover the circuit board. Due to the space limitation in the electronic product, the circuit board is closer to the inner wall of the shielding cover, especially when the circuit board size is small, the shielding cover is The size is also reduced, the board is too close to the inner wall of the shield, and static electricity can enter the insulating cover from the connection of the upper and lower covers.

Summary of the invention

Based on this, the present invention overcomes the deficiencies of the prior art and provides an electrostatic shielding device with good shielding effect.

Its technical solutions are as follows:

An electrostatic shielding device includes a first shielding cover and a second shielding cover, wherein the first shielding cover and the second shielding cover cooperate to form a receiving cavity, and the receiving cavity is provided with a circuit board, the first shielding The cover is provided with a connecting portion that is mated with the second shielding cover, the connecting portion is covered with a first conductive layer, and the first conductive layer is connected to a grounding point of the circuit board.

The following is a further description of a technical solution:

In one embodiment, the inner wall of the first shielding cover is provided with ribs, the ribs abut the grounding points of the circuit board, and the surface of the ribs is provided with a second conductive layer. The first conductive layer is connected to the second conductive layer.

In one embodiment, the rib is extended from an edge of the inner wall of the first shielding cover toward a middle portion of the first shielding cover, and the first conductive layer is along an inner wall of the first shielding cover. The middle portion of the first shielding cover extends, and the first conductive layer is connected to the second conductive layer on the side of the rib.

In one embodiment, the connecting portion is provided with a protrusion, the protrusion is circumferentially disposed along the first shielding cover, and the second shielding cover is disposed at a position corresponding to the protruding portion. There is a recessed portion, and the first shielding cover and the second shielding cover are coupled to each other by the protrusion and the recessed portion.

In one embodiment, the protrusion is disposed at an edge of the inner wall of the first shielding cover, and the protrusion is connected to an end of the rib adjacent to an edge of the first shielding cover.

In one embodiment, the first conductive layer is disposed on a surface of the protrusion, and the first conductive layer on the protrusion is connected to the second conductive layer on the rib.

In one embodiment, a fixing post is disposed on an inner wall of the first shielding cover or the second shielding cover, and the fixing post is provided with a fixing hole, and the circuit board is corresponding to the fixing hole a matching hole is disposed at a position, and a fastener passes through the matching hole, and the circuit board and the fixing post are coupled with the thread of the fixing hole through the fastener, and the circuit board is located away from the a junction of the first shielding cover and the second shielding cover.

In one embodiment, the first shielding cover and the second shielding cover are both plastic covers, and the first shielding cover and the second shielding cover are both circular covers.

In one embodiment, a third conductive layer is disposed on the second shielding cover at a corresponding position of the first conductive layer.

In one embodiment, the first conductive layer, the second conductive layer, and the third conductive layer are both metal coatings.

The advantages or principles of the foregoing technical solutions are described below:

The electrostatic shielding device uses a first shielding cover and a second shielding cover to enclose a receiving cavity, and the circuit board is mounted in the receiving cavity. The first shielding cover cooperates with the second shielding cover to function as an electrostatic shielding, and at the same time in the first shielding. The cover is provided with a connecting portion with the second shielding cover, the connecting portion is covered with the first conductive layer, and the first conductive layer is connected with the grounding position of the circuit board, and when the static electricity enters the first shielding cover and the second shielding cover is connected When the gap is in the middle, the static electricity is attracted by the first conductive layer, and a current is formed on the first conductive layer to flow into the grounding position of the circuit board, thereby preventing static electricity from entering the receiving cavity, and preventing the static electricity from contacting the important circuit on the circuit board, thereby causing the circuit board to fail. The electrostatic shielding device is connected to the grounding position of the circuit board by the first conductive layer, so that the static electricity is attracted by the first conductive layer to form a current flowing into the grounding position of the circuit board, and shielding The effect is better.

DRAWINGS

1 is a schematic cross-sectional view of an electrostatic shielding device;

2 is a schematic structural view of a first shielding cover;

3 is a schematic structural view of a second shielding cover.

Description of the reference signs:

100, a first shielding cover, 110, a connecting portion, 120, a first conductive layer, 130, a rib, 140, a second conductive layer, 150, a protrusion, 200, a second shielding cover, 210, a recess, 220, Fixed column, 300, housing cavity, 400, circuit board.

detailed description

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 and FIG. 2, the electrostatic shielding device includes a first shielding cover 100 and a second shielding cover 200. The first shielding cover 100 and the second shielding cover 200 cooperate to form a receiving cavity 300. The receiving cavity 300 is provided with a circuit board. 400. The first shielding cover 100 is provided with a connecting portion 110 that is mated with the second shielding cover 200. The connecting portion 110 is covered with the first conductive layer 120, and the first conductive layer 120 is connected to the grounding position of the circuit board 400. The first shielding cover 100 and the second shielding cover 200 cooperate to function as an electrostatic shield, and the first conductive layer 120 is disposed on the connecting portion of the first shielding cover 100 and the second shielding cover 200, and the first conductive layer 120 and The grounding position of the circuit board 400 is connected. When static electricity enters the gap between the first shielding cover 100 and the second shielding cover 200, the static electricity is attracted by the first conductive layer 120, and a current flowing into the circuit is formed on the first conductive layer 120. The grounding position of the board 400 prevents static electricity from entering the accommodating cavity 300 and contacting the important circuit on the circuit board 400, thereby causing the circuit board 400 to fail. In addition, the mating connection of the first shielding cover 100 and the second shielding cover 200 is convenient for the circuit board. Repair and replacement, while low cost.

As shown in FIG. 2, the inner wall of the first shielding cover 100 is provided with a rib 130, and the ribs 130 and the grounding position of the circuit board 400 abut each other, and the surface of the rib 130 is provided with a second conductive layer 140, the first conductive Layer 120 is coupled to second conductive layer 140. When static electricity is attracted by the first conductive layer 120 and a current is formed on the first conductive layer 120, current flows into the second conductive layer 140 and flows into the electricity through the second conductive layer 140. The grounding position of the circuit board 400 and the second conductive layer 140 on the rib 130 serve as a draining function to ensure that current flows into the grounding position of the circuit board 400.

As shown in FIG. 2 , the rib 130 extends from the edge of the inner wall of the first shielding cover 100 toward the middle of the first shielding cover 100 , and the first conductive layer 120 faces the middle of the first shielding cover 100 along the inner wall of the first shielding cover 100 . The first conductive layer 120 is connected to the second conductive layer 140 on the side of the rib 130. Since the first conductive layer 120 extends toward the middle of the first shielding cover 100, if the static electricity enters the receiving cavity 300 through the gap between the first shielding cover 100 and the second shielding cover 200, the extended portion of the first conductive layer 120 may be opposite. The static electricity is attracted to enhance the electrostatic shielding effect of the electrostatic shielding device, and the portion of the first conductive layer 120 extending is connected to the second conductive layer 140 on the side of the rib 130 to ensure that the current in the first conductive layer 120 can smoothly flow into the second Conductive layer 140.

As shown in FIG. 2 and FIG. 3, the connecting portion 110 is provided with a protruding portion 150. The protruding portion 150 is circumferentially disposed along the first shielding cover 100, and the second shielding cover 200 is provided with a recess at a position corresponding to the protruding portion 150. The first shield cover 100 and the second shield cover 200 are coupled to the recessed portion 210 by the protrusion 150. The protrusion 150 is disposed at the edge of the inner wall of the first shield cover 100, and the protrusion 150 is adjacent to the rib 130. One end of the edge of the shielding cover 100 is connected, and the first conductive layer 120 is disposed on the surface of the protrusion 150. The first conductive layer 120 on the protrusion 150 is connected to the second conductive layer 140 on the rib 130. The protrusions 150 can prevent static electricity from entering the accommodating cavity, and the cooperation of the protrusions 150 and the recesses 210 makes the shape of the gap between the first shielding cover 100 and the second shielding cover 200 relatively curved, thereby increasing the static electricity entering the accommodating cavity 300 through the gap. The difficulty of the shielding effect of the electrostatic shielding device is enhanced. The protruding portion 150 is disposed at the edge of the inner wall of the first shielding cover 100, and the protruding portion 150 is connected to the rib 130, and the first conductive layer is disposed on the surface of the protruding portion 150. 120. At this time, the second conductive layer 140 on the rib 130 is directly connected to the first conductive layer 120, and the current formed by the first conductive layer 120 after being attracted to the static electricity can be quickly introduced into the second conductive layer 140.

In this embodiment, the longitudinal section of the protrusion 150 is square, but the cross section of the protrusion 150 may also be a triangle or a trapezoid or the like, and the protrusion 150 may also be disposed on the first shielding cover 100 and the second shielding cover 200. Match any area of the connection.

As shown in FIG. 3, the inner wall of the first shielding cover 100 or the second shielding cover 200 is provided with a fixing post 220. The fixing post 220 is provided with a fixing hole, and the circuit board 400 is provided with a matching hole at a corresponding position with the fixing hole. , The fastener passes through the mating hole, and the circuit board 400 and the fixing post 220 are coupled to the screw of the fixing hole by a fastener, and the circuit board 400 is located away from the joint of the first shielding cover 100 and the second shielding cover 200. The fixing post 220 can fix the circuit board 400. When fixing the circuit board 400, the circuit board 400 should be ensured to be away from the connection between the first shielding cover 100 and the second shielding cover 200 to prevent static electricity from being blocked by the first shielding cover 100. After the gap connecting the second shield cover 200 enters the accommodating cavity 300, direct contact with an important circuit on the circuit board 400 causes the circuit board 400 to fail.

In this embodiment, the circuit board 400 is fixed by the connection of the fixing post 220 and the circuit board 400. The fixing post 220 is disposed on the inner wall of the second shielding cover 200. According to the specific structure of the circuit board 400, a plurality of fixing columns can be disposed. 220, the fixing post 220 may also be disposed on the inner wall of the first shielding cover 100. In addition, the circuit board 400 can be fixed by using the connection between the grounding position of the circuit board 400 and the rib 130, for example, the grounding position of the conductive rib board 130 and the circuit board 400, or the grounding position of the circuit board 400, and the ribs. A hole is provided in the plate 130 at a position corresponding to the grounding position, and the circuit board 400 is fixed to the rib 130 by the cooperation of the screw and the hole.

As shown in FIG. 1 and FIG. 2 , the first shielding cover 100 and the second shielding cover 200 are both plastic covers, and the first shielding cover 100 and the second shielding cover 200 are both circular.

In this embodiment, the first shielding cover 100 and the second shielding cover 200 are both plastic covers. The plastic cover has good insulation effect, can isolate external current and prevent short circuit of the circuit board, and the plastic is easy to form, and the cost is low, but the first The shielding cover 100 and the second shielding cover 200 may also be other insulating materials.

In this embodiment, the first shielding cover 100 and the second shielding cover 200 are both circular covers, but according to the shape of the circuit board 400, the first shielding cover 100 and the second shielding cover 200 may have other shapes, such as a square shape. Cover and so on.

A third conductive layer is disposed on the second shielding cover 200 at a corresponding position with the first conductive layer 120. In order to ensure that static electricity does not enter the accommodating cavity 300 by the gap at which the first shielding cover 100 and the second shielding cover 200 are connected, a third conductive layer may be disposed on the second shielding cover 200 at a position corresponding to the first conductive layer 120. When the first shielding cover 100 is mated with the second shielding cover 200, the third conductive layer is in contact with the first conductive layer 120, and the third conductive layer can also attract static electricity and conduct to the first conductive layer, thereby increasing the electrostatic shielding device. Electrostatic shielding effect.

The first conductive layer 120, the second conductive layer 140 and the third conductive layer are both metal coatings. In this implementation In the example, the first conductive layer 120, the second conductive layer 140, and the third conductive layer are all metal coatings, and the metal coatings are of the same type, and the processing is: first spraying a coating containing metal ions Then, the above coating is scanned by a laser, and the metal ion-containing coating releases the metal atom under the induction of the laser, and finally immersed in a solution containing the same metal ion, and the metal ion is deposited by using the metal atom as a core, and finally forms a conductive. Metal coating.

In this embodiment, the first conductive layer 120, the second conductive layer 140 and the third conductive layer are both metal coatings, but materials capable of attracting static electricity and converting them into internal currents of the conductive layer can be used for the above-mentioned A conductive layer 120, a second conductive layer 140 and a third conductive layer.

The technical features of the above-described embodiments may be arbitrarily combined. For the sake of brevity of description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be considered as the scope of this manual.

The above-described embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

An electrostatic shielding device, comprising: a first shielding cover and a second shielding cover, wherein the first shielding cover and the second shielding cover cooperate to form a receiving cavity, and the receiving cavity is provided with a circuit board, The first shielding cover is provided with a connecting portion that is mated with the second shielding cover, and the connecting portion is covered with a first conductive layer, and the first conductive layer is connected to a grounding point of the circuit board.
The electrostatic shielding device according to claim 1, wherein the inner wall of the first shielding cover is provided with a rib, and the rib and the grounding point of the circuit board abut each other, and the surface of the rib A second conductive layer is disposed, and the first conductive layer is connected to the second conductive layer.
The electrostatic shielding device according to claim 2, wherein the rib is extended from an edge of the inner wall of the first shielding cover toward a middle portion of the first shielding cover, and the first conductive layer is along the An inner wall of the first shielding cover extends toward a middle portion of the first shielding cover, and the first conductive layer is connected to a second conductive layer on a side of the rib.
The electrostatic shielding device according to claim 3, wherein the connecting portion is provided with a protrusion, the protrusion is circumferentially disposed along the first shielding cover, and the second shielding cover is A recess is provided at a position corresponding to the protrusion, and the first shield cover and the second shield cover are coupled to each other by the protrusion and the recess.
The electrostatic shielding device according to claim 4, wherein the protrusion is provided at an edge of the inner wall of the first shielding cover, and the protrusion is adjacent to the edge of the first shielding cover Connected at one end.
The electrostatic shielding device according to claim 5, wherein said first conductive layer is disposed on a surface of said protrusion, said first conductive layer on said protrusion and said first on said rib Two conductive layers are connected.
The electrostatic shielding device according to any one of claims 1 to 6, wherein the inner wall of the first shielding cover or the second shielding cover is provided with a fixing post, and the fixing post is provided with a fixing hole. And the circuit board is provided with a matching hole at a position corresponding to the fixing hole, the fastener passes through the matching hole, and the circuit board and the fixing post pass the fastener and the fixing hole The threaded mating connection is located at a junction away from the first shield cover and the second shield cover.
The electrostatic shielding device according to any one of claims 1 to 6, wherein said first A shielding cover and the second shielding cover are both plastic covers, and the first shielding cover and the second shielding cover are both circular covers.
The electrostatic shielding device according to any one of claims 1 to 6, wherein a third conductive layer is disposed on the second shielding cover at a position corresponding to the first conductive layer.
The electrostatic shielding device according to claim 9, wherein the first conductive layer, the second conductive layer and the third conductive layer are both metal coating layers.