Protective shell structure of PCB (Printed Circuit Board)

By designing the metal shell and conductive repulsing parts in the PCB board protective shell structure to form a Faraday cage structure, the damage problem of electrostatic discharge to the chip in the prior art is solved, effective shielding of static electricity and high-frequency energy is achieved, and the The service life of electronic devices.

CN222302300UActive Publication Date: 2025-01-03SHANGHAI JINMAI ELECTRONICS TECH
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202420741670.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-11
Publication Date
2025-01-03
Estimated Expiration
2034-04-11

AI Technical Summary

Technical Problem

The metal protective shell structure of the existing PCB board cannot effectively protect the chip during electrostatic discharge, resulting in failure of electrostatic discharge, and in severe cases it will damage the chip, affecting the working reliability and service life of electronic devices.

Method used

A PCB board protective shell structure is designed, including a metal shell and a conductive repulsing member, forming a Faraday cage structure, with the metal ring grounded, and the conductive repulsing member tightly against the surface of the PCB board, ensuring that the electrostatic energy is released outside without affecting the chip.

Benefits of technology

Effectively protect the chip from electrostatic discharge damage, extends the service life of electronic devices, and improves the shielding effect of high-frequency energy.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN222302300U_ABST
    Figure CN222302300U_ABST
Patent Text Reader

Abstract

The utility model belongs to the technical field of electronic components, and discloses a PCB protective shell structure, which comprises a metal shell, the metal shell comprises an upper shell part and a lower shell part, a PCB can be accommodated in the lower shell part, a metal ring is arranged around the outer edge of the PCB in the lower shell part, the metal ring is grounded, a chip is positioned in the metal ring, the upper shell part covers the lower shell part, and the lower shell part covers the lower shell part. The side, facing the lower shell part, of the upper shell part is provided with a conductive abutting piece, the conductive abutting piece is in a closed loop shape, and the conductive abutting piece is suitable for abutting against the surface of the PCB when the lower shell part is covered with the upper shell part. According to the PCB protection shell structure provided by the utility model, the grounding metal ring is arranged on the outer edge of the PCB in a surrounding manner, and the conductive pressing piece is arranged, so that the chip on the PCB can be surrounded when the upper shell part and the lower shell part are covered to form a Faraday cage structure, high-voltage and high-frequency energy generated by external static electricity cannot be released to the chip, and the reliability of the PCB protection shell structure is improved. Therefore, electrostatic protection of the chip is achieved.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model relates to the technical field of electronic components, in particular to a PCB board protective shell structure. Background Art

[0002] The application of high-speed circuit electronic products has the characteristics of low voltage, high speed, weak anti-interference ability, and sensitivity to external high voltage and high-frequency interference signals. In particular, the ESD (Electro-Static discharge) phenomenon that is often generated during the operation of the equipment is a major hidden danger that causes equipment damage.

[0003] In the prior art, a protective shell structure made of metal is provided outside the PCB board. When the electronic device is working, ESD discharge generates high-frequency radiation energy, which is easily coupled to the chip on the PCB board through the gap inside the protective shell structure, causing electrostatic discharge failure. In severe cases, it may cause damage to the chip on the PCB board, affecting the working reliability and service life of the electronic device. Utility Model Content

[0004] The utility model aims to provide a PCB protective shell structure with a simple structure, which can avoid the damage of electrostatic discharge to the chip on the PCB and realize electrostatic protection for the chip.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A PCB board protective shell structure comprises a metal shell, wherein the metal shell comprises an upper shell portion and a lower shell portion; wherein:

[0007] The lower shell part can accommodate a PCB board, and a chip is arranged on the PCB board. A metal ring is arranged around the outer edge of the PCB board in the lower shell part, and the metal ring is grounded, and the chip is located inside the metal ring;

[0008] The upper shell portion is covered on the lower shell portion, and a conductive pressing piece is provided on the side of the upper shell portion facing the lower shell portion. The conductive pressing piece is in a closed loop shape and is suitable for tightly pressing against the surface of the PCB board when the upper shell portion is covered on the lower shell portion.

[0009] Preferably, the metal ring is arranged in a closed loop shape.

[0010] Preferably, the conductive pressing member is made of elastic material.

[0011] Preferably, the lower shell, the PCB board and the upper shell are fixedly connected by a connector; wherein,

[0012] The lower shell portion is provided with a first hole, the PCB board is provided with a second hole, the upper shell portion is provided with a third hole, the connecting member passes through the first hole, the second hole and the third hole, and is fixedly connected to the first hole, the second hole and the third hole.

[0013] Preferably, the connecting member is configured as a screw, and the third hole is correspondingly configured as a threaded hole. The screw passes through the first hole and the second hole and is threadedly connected to the third hole.

[0014] Preferably, a sealing protrusion is provided on the side of the lower shell portion facing the upper shell portion, and a sealing groove is provided on the side of the upper shell portion facing the lower shell portion, and the sealing protrusion is suitable for being inserted into the sealing groove when the upper shell portion is covered on the lower shell portion.

[0015] Preferably, a pressing groove corresponding to the conductive pressing member is provided on the surface of the PCB board;

[0016] The conductive pressing member is suitable for partially extending into the pressing groove and tightly pressing against the groove bottom of the pressing groove when the upper shell part is covered on the lower shell part.

[0017] Preferably, a positioning groove is provided in the lower shell portion, and the PCB board is placed in the positioning groove.

[0018] Preferably, the conductive pressing member is glued to the upper shell portion.

[0019] Preferably, the material of the metal ring is copper.

[0020] Beneficial effects:

[0021] The utility model provides a PCB board protection shell structure, wherein the lower shell part can accommodate the PCB board, the PCB board is provided with a chip, the lower shell part is provided with a metal ring around the outer edge of the PCB board, the metal ring is grounded, the chip is located inside the metal ring, the upper shell part is covered on the lower shell part, the upper shell part is provided with a conductive pressing piece on the side facing the lower shell part, the conductive pressing piece is in a closed loop shape, and the conductive pressing piece is suitable for tightly pressing against the surface of the PCB board when the upper shell part is covered on the lower shell part. By surrounding the outer edge of the PCB board with a grounded metal ring and providing a conductive pressing piece, the chip on the PCB board can be surrounded when the upper and lower shell parts are covered, forming a Faraday cage structure, so that the high voltage and high frequency energy generated by external static electricity cannot be released to the chip, thereby achieving electrostatic protection of the chip, avoiding damage to the PCB board, ensuring reliable operation of electronic devices, and extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the PCB half protective shell structure provided by the utility model;

[0023] Figure 2 It is a schematic diagram of a PCB board in a PCB semi-protective shell structure provided by the utility model;

[0024] Figure 3 This is an exploded schematic diagram of the PCB half protective shell structure provided by the utility model;

[0025] Figure 4 It is a cross-sectional schematic diagram of the PCB half protective shell structure provided by the utility model;

[0026] Figure 5 This utility model Figure 4 A local enlarged schematic diagram of point A in the middle.

[0027] In the figure:

[0028] 1. upper shell; 101. third hole; 11. conductive pressing member; 12. sealing groove;

[0029] 2. lower shell; 201. first hole; 21. metal ring; 22. sealing protrusion;

[0030] 3. PCB board; 301. second hole; 31. chip; 32. pressing groove. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] The utility model provides a PCB board protective shell structure. Figures 1 to 5 As shown, the PCB board protection shell structure includes a metal shell, and the metal shell includes an upper shell part 1 and a lower shell part 2. Among them, the lower shell part 2 can accommodate a PCB board 3, and a chip 31 is arranged on the PCB board 3. A metal ring 21 is arranged around the outer edge of the PCB board 3 in the lower shell part 2, and the metal ring 21 is grounded, and the chip 31 is located inside the metal ring 21; the upper shell part 1 is covered on the lower shell part 2, and a conductive pressing member 11 is arranged on the side of the upper shell part 1 facing the lower shell part 2. The conductive pressing member 11 is in a closed loop shape, and the conductive pressing member 11 is suitable for tightly pressing against the surface of the PCB board 3 when the upper shell part 1 is covered on the lower shell part 2.

[0036] In this embodiment, a grounded metal ring 21 is arranged around the outer edge of the PCB board 3, and a conductive pressing member 11 is provided, so that the structure is simple and the space occupied is small. When the upper shell 1 and the lower shell 2 are covered, the chip 31 on the PCB board 3 can be surrounded to form a complete Faraday cage structure. The high-voltage and high-frequency energy generated by external static electricity can only be released on the outer surface of the Faraday cage and cannot be released to the chip 31, thereby achieving electrostatic protection for the chip 31, avoiding damage to the PCB board 3, ensuring reliable operation of electronic devices, and extending the service life.

[0037] In this embodiment, the conductive pressing member 11 is made of elastic material, so as to avoid a gap between the conductive pressing member 11 and the PCB board 3 when the upper shell 1 and the lower shell 2 are covered, thereby ensuring a tight contact and a reliable seal.

[0038] Exemplarily, the conductive pressing member 11 may be made of conductive TPE material.

[0039] Exemplarily, the material of the metal ring 21 is copper, which has low cost and good conductivity.

[0040] In this embodiment, the metal ring 21 is arranged in a closed loop shape. Such an arrangement can ensure that the entire outer edge of the PCB board 3 has a good and reliable grounding effect, ensuring that the charges can flow to the ground.

[0041] In this embodiment, the lower shell 2, the PCB board 3, and the upper shell 1 are fixedly connected by a connector (not shown). The lower shell 2 is provided with a first hole 201, the PCB board 3 is provided with a second hole 301, and the upper shell 1 is provided with a third hole 101. The connector penetrates the first hole 201, the second hole 301, and the third hole 101, and is fixedly connected to the first hole 201, the second hole 301, and the third hole 101.

[0042] As an optional implementation, the connecting member is configured as a screw, and the third hole 101 is correspondingly configured as a threaded hole. The screw passes through the first hole 201 and the second hole 301 and is threadedly connected to the third hole 101 .

[0043] In some other embodiments, the connecting member can also be configured as a bolt assembly, which includes a bolt and a nut. The bolt passes through the first hole 201, the second hole 301 and the third hole 101 and is threadedly connected to the nut, thereby realizing a fixed connection between the lower shell 2, the PCB board 3 and the upper shell 1.

[0044] In this embodiment, the upper shell 1, the PCB board 3 and the lower shell 2 are all configured as rectangular plates, wherein the first holes 201 are evenly distributed on the periphery of the upper shell 1, the second holes 301 are evenly distributed on the periphery of the PCB board 3, and the third holes 101 are evenly distributed on the periphery of the lower shell 2.

[0045] As an optional embodiment, a sealing protrusion 22 is provided on the side of the lower shell 2 facing the upper shell 1, and a sealing groove 12 is provided on the side of the upper shell 1 facing the lower shell 2, and the sealing protrusion 22 is suitable for being inserted into the sealing groove 12 when the upper shell 1 is covered on the lower shell 2. Specifically, by providing the sealing protrusion 22 and the sealing groove 12, when the upper shell 1 and the lower shell 2 are covered, the sealing protrusion 22 is inserted into the sealing groove 12, and together with the sealing groove 12, a labyrinth structure is formed, so as to further improve the sealing between the upper shell 1 and the lower shell 2, and further ensure the sealing effect.

[0046] As an optional embodiment, a pressing groove 32 corresponding to the conductive pressing member 11 is provided on the surface of the PCB board 3. The conductive pressing member 11 is adapted to partially extend into the pressing groove 32 and abut against the bottom of the pressing groove 32 when the upper shell 1 is covered on the lower shell 2. By providing the pressing groove 32, on the one hand, it can ensure that the conductive pressing member 11 can be pressed into place, thereby achieving the positioning of the conductive pressing member 11; on the other hand, a labyrinth structure can be formed between the pressing end of the conductive pressing member 11 and the pressing groove 32, further ensuring the internal sealing effect.

[0047] As an optional embodiment, a positioning groove (not shown) is provided in the lower shell 2, and the PCB board 3 is placed in the positioning groove. By providing the positioning groove, the PCB board 3 can be easily installed in place relative to the lower shell 2, realizing a rapid positioning function.

[0048] As an optional implementation, the conductive pressing member 11 is glued to the upper shell 1. The glue connection is quick and convenient, and the connection is firm and reliable.

[0049] In summary, the PCB board protective shell structure provided in this embodiment has a grounded metal ring 21 around the outer edge of the PCB board 3, and a conductive pressing piece 11 is provided on the side of the upper shell 1 facing the lower shell 2. When the upper shell 1 and the lower shell 2 are covered, the conductive pressing piece 11 and the metal tube can surround the chip 31 on the PCB board 3 to form a Faraday cage structure. The formation of the Faraday cage can prevent the high voltage and high frequency energy generated by external static electricity from being released to the chip 31, thereby achieving electrostatic protection for the chip 31, avoiding damage to the PCB board 3, ensuring that the electronic device works reliably and effectively, and extending the service life of the electronic device. Practical tests have shown that the Faraday cage has a good shielding effect on static electricity and high frequency energy. In theory, the electrostatic protection of the chip 31 on the PCB board 3 can reach more than 25kV.

[0050] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A PCB board protective shell structure, characterized in that: It comprises a metal shell, wherein the metal shell comprises an upper shell portion (1) and a lower shell portion (2); wherein, The lower shell (2) can accommodate a PCB board (3), a chip (31) is provided on the PCB board (3), a metal ring (21) is provided around the outer edge of the PCB board (3) in the lower shell (2), the metal ring (21) is grounded, and the chip (31) is located inside the metal ring (21); The upper shell portion (1) is covered on the lower shell portion (2); a conductive pressing piece (11) is provided on the side of the upper shell portion (1) facing the lower shell portion (2); the conductive pressing piece (11) is in a closed loop shape; the conductive pressing piece (11) is suitable for tightly pressing against the surface of the PCB board (3) when the upper shell portion (1) is covered on the lower shell portion (2).

2. The PCB protective shell structure according to claim 1, characterized in that: The metal ring (21) is arranged in a closed loop shape.

3. The PCB protective shell structure according to claim 1, characterized in that: The conductive pressing member (11) is made of an elastic material.

4. The PCB protective shell structure according to claim 1, characterized in that: The lower shell (2), the PCB board (3), and the upper shell (1) are fixedly connected via a connecting piece; wherein: The lower shell portion (2) is provided with a first hole (201), the PCB board (3) is provided with a second hole (301), the upper shell portion (1) is provided with a third hole (101), and the connecting member passes through the first hole (201), the second hole (301) and the third hole (101), and is fixedly connected to the first hole (201), the second hole (301) and the third hole (101).

5. The PCB board protective shell structure according to claim 4, characterized in that: The connecting member is configured as a screw, and the third hole (101) is correspondingly configured as a threaded hole. The screw passes through the first hole (201) and the second hole (301) and is threadedly connected to the third hole (101).

6. The PCB protective shell structure according to claim 1, characterized in that: A sealing protrusion (22) is provided on the side of the lower shell part (2) facing the upper shell part (1), and a sealing groove (12) is provided on the side of the upper shell part (1) facing the lower shell part (2). The sealing protrusion (22) is suitable for being inserted into the sealing groove (12) when the upper shell part (1) is covered on the lower shell part (2).

7. The PCB protective shell structure according to claim 1, characterized in that: The surface of the PCB board (3) is provided with a pressing groove (32) corresponding to the conductive pressing piece (11); The conductive pressing member (11) is suitable for partially extending into the pressing groove and tightly pressing against the bottom of the pressing groove (32) when the upper shell part (1) is covered on the lower shell part (2).

8. The PCB protective shell structure according to claim 1, characterized in that: A positioning groove is provided in the lower shell portion (2), and the PCB board (3) is placed in the positioning groove.

9. The PCB protective shell structure according to claim 1, characterized in that: The conductive pressing piece (11) is glued onto the upper shell portion (1).

10. The PCB protective shell structure according to claim 1, characterized in that: The material of the metal ring (21) is copper.