WO2018133180A1

WO2018133180A1 - Multilayer circuit board protection mechanism

Info

Publication number: WO2018133180A1
Application number: PCT/CN2017/075903
Authority: WO
Inventors: 杜红伟; 李科林
Original assignee: 华为技术有限公司
Priority date: 2017-01-17
Filing date: 2017-03-07
Publication date: 2018-07-26
Also published as: CN108702860A

Abstract

A multilayer circuit board protection mechanism comprises a first circuit board (1), a second circuit board (2), and a connecting component (3). The first circuit board (1) and the second circuit board (2) are adjacent and are disposed in parallel to each other. A first shielding case (4) is disposed on the first circuit board (1), a second shielding case (5) is disposed on the second circuit board (2). The first shielding case (4) and the second shielding case (5) are located between the first circuit board (1) and the second circuit board (2) and are relatively disposed. An opening (40, 50) is formed in each of the first shielding case (4) and the second shielding case (5), The connecting component (3) is disposed in a manner of penetrating through the openings (40, 50). A limit structure is disposed between the first shielding case (4) and the second shielding case (5), and the limiting structure can limit relative movement of the first shielding case (4) and the second shielding case (5) along a direction parallel to the first circuit board (1).

Description

Multilayer circuit board protection mechanism

This application claims the priority of the Chinese Patent Application, filed on Jan. 17, 2017, filed Jan.

Technical field

The present invention relates to the field of multi-layer circuit boards, and in particular, to a multi-layer circuit board protection mechanism.

Background technique

MBB (Mobile Broadband) part of the product uses the main and sub-board architecture, that is, two-layer circuit board structure, the two-layer circuit board is connected by BTB (Board to Board board-to-board) connector, in the mechanical reliability test, two The layer circuit board is easily moved in a direction parallel to the circuit board due to the external action. When the motion displacement of the two layers is too large, the BTB connector is easily damaged by the circuit board, thereby causing the product to be powered off or Damage problem. How to limit the relative motion between the boards in the direction parallel to the board becomes a problem that designers need to solve.

The following two structural design schemes are adopted in the existing main and sub-board architectures: (1) designing screws between two circuit boards and on both sides of the BTB connector; (2) two-layer circuit by large-area adhesive form The boards are reliably glued together.

Although the above two structural design schemes can limit the relative motion between the two layers of boards during the mechanical reliability test, for the first structural design, the screw studs need to be added, which is not only costly but also occupies More board space, which has a greater impact on the layout of the board; for the second structure design, the solution requires a large area of bonding space between the two boards, so that the RF performance of the board is certain The impact also increases the maintenance cost of the board.

Summary of the invention

The present invention provides a multi-layer circuit board protection mechanism capable of limiting relative motion occurring between circuit boards without affecting circuit board layout and radio frequency performance.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

In a first aspect, an embodiment of the present invention provides a multi-layer circuit board protection mechanism, including a first circuit board and a second circuit board, and a connection device disposed between the first circuit board and the second circuit board, the first circuit The first circuit board is disposed adjacent to the second circuit board, and the first circuit board is provided with a first shielding cover, and the second circuit board is provided with a second shielding cover. The first shielding cover and the second shielding cover are located at the first a first opening is formed between the circuit board and the second circuit board, a first opening is defined in the first shielding cover, and a second opening is defined in the second shielding cover, and the connecting device is disposed through the first opening and the second opening, first A limiting structure is disposed between the shielding cover and the second shielding cover, and the limiting structure limits the relative movement of the first shielding cover and the second shielding cover in a direction parallel to the first circuit board.

According to the multi-layer circuit board protection mechanism provided by the embodiment of the present invention, since the limiting structure is disposed between the first shielding cover and the second shielding cover, the limiting structure can limit the first shielding cover and the second shielding cover to be parallel to the first circuit. The relative movement of the plates in the direction such that no additional parts are required on the first circuit board and the second circuit board to limit their relative movement in a direction parallel to the first circuit board, thereby reducing the first circuit board and the second circuit Shadow of component layout on the board Because the limiting structure is disposed between the first shielding cover and the second shielding cover, the first shielding cover and the second shielding cover can reduce the influence of the external environment on the RF performance of the first circuit board and the second circuit board, Therefore, the setting of the limiting structure has less influence on the radio frequency performance of the first circuit board and the second circuit board. Therefore, compared with the prior art, the multi-layer circuit board protection mechanism provided by the embodiment of the present invention can limit the relative motion between the shields without affecting the layout of the circuit board and the radio frequency performance, thereby limiting the relationship between the boards. Relative movement occurs, thereby avoiding damage to the connecting devices between the boards (such as the BTB connector) due to excessive movement between the boards.

In conjunction with the first aspect, in a first possible implementation manner of the first aspect, the first shielding cover includes a first cover bottom and a first side plate formed on a peripheral edge of the first cover bottom, the first An opening is formed on the first cover bottom, the first side plate is fixedly connected to the first circuit board; the second shielding cover includes a second cover bottom and a peripheral edge formed on the second cover bottom The second side plate is opened on the second cover bottom, and the second side plate is fixedly connected to the second circuit board.

The first shielding cover and the second shielding cover may also be configured as follows: the first shielding cover includes a first cover body, the first cover body is formed with a plurality of mesh holes, and the first cover body is formed with a first cover opening, a rim of the cover is fixedly connected to the first circuit board, the first opening is formed on the first cover; the second cover comprises a second cover, the second cover is formed with a plurality of meshes, and the second cover A second cover is formed on the second cover, and the second cover is fixedly connected to the second circuit board, and the second opening is formed on the second cover. Compared with the structure of the first shield cover and the cover of the second shield cover having a plurality of mesh structures, the first shield cover and the second shield cover of the former solution have higher structural strength and are less prone to deformation, when the limit is When the structure is disposed on the first shield or the second shield, it can have sufficient strength to limit the relative motion between the two

In conjunction with the first possible implementation of the first aspect, in a second possible implementation manner of the first aspect, the limiting structure includes a flanged rib disposed on a first opening edge, and the flanged rib fits The utility model is disposed in the second opening. The method of fitting the limit by the flange and the second opening is simple in structure, easy to disassemble and convenient to maintain, and does not need to add other parts, which is beneficial to reduce the cost.

In conjunction with the first or second possible implementation of the first aspect, in a third possible implementation manner of the first aspect, the first cover bottom defines a slot, and the second cover is provided The limiting ribs are disposed in the limiting slot. Thus, the flange on the first shield is inserted into the second opening of the second shield, and the limiting rib on the second shield is inserted into the limiting slot on the first shield to form an inter-insertion structure. The first shield and the second shield can be further restricted to move in a direction parallel to the first circuit board, thereby improving the limiting effect between the first circuit board and the second circuit board.

In conjunction with the first possible implementation of the first aspect, in a fourth possible implementation manner of the first aspect, the limiting structure includes a limiting protrusion disposed on the first cover and opening a limiting hole on the second cover bottom, wherein the limiting protrusion fits through the limiting hole. The limiting hole can limit the movement of the limiting protrusion in a direction parallel to the first circuit board, thereby restricting the relative movement of the first shielding cover and the second shielding cover, thereby limiting the first circuit board and the second circuit. The relative movement of the plates, the connecting device will not be damaged by the relative movement of the first circuit board and the second circuit board.

In conjunction with the fourth possible implementation of the first aspect, in a fifth possible implementation manner of the first aspect, the limiting protrusion is a plurality, and the plurality of the limiting protrusions surround the first The opening is disposed; the plurality of limiting holes are disposed around the second opening, and are in one-to-one correspondence with the plurality of limiting protrusions. The plurality of limiting protrusions are matched with the plurality of limiting holes in one-to-one correspondence, when the first shielding cover and the second shielding cover are parallel When the first circuit board is relatively moved in the direction of the first circuit board, the force of the limiting protrusion can be greatly reduced, and the deformation occurring is also greatly reduced, thereby facilitating the improvement of the limiting effect between the first circuit board and the second circuit board; The plurality of limiting protrusions are disposed around the first opening, and the plurality of limiting holes are disposed around the second opening, so that the first shielding cover and the second shielding cover can be more accurately restricted, avoiding the first opening and the second opening The inner wall of the opening contacts the connecting device when the first shield and the second shield move relative to each other in a direction parallel to the first circuit board, which is more advantageous for the protection of the connecting device.

In conjunction with the second possible implementation of the first aspect, in a sixth possible implementation of the first aspect, the rib is formed by bending or stretching. The ribs are made by a process of stretching or bending the material of the first shield itself, which is advantageous in reducing the manufacturing cost.

In conjunction with the second possible implementation of the first aspect, in a seventh possible implementation of the first aspect, the connection between the flange and the first cover is provided with a reinforcing rib. In this way, the connection strength between the flange and the first cover bottom can be increased, and the rigidity of the flange can be increased, so that the flange can be greatly reduced in the direction in which the first shield and the second shield are parallel to the first circuit board. Deformation that occurs during exercise.

In conjunction with the third possible implementation of the first aspect, in an eighth possible implementation of the first aspect, the limiting rib is formed by bending. The limit rib is made by a process of bending the material of the second shield itself, which is advantageous for reducing the manufacturing cost.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a schematic structural view of a multi-layer (two-layer) circuit board protection mechanism according to an embodiment of the present invention;

2 is a schematic structural view of a multi-layer (two-layer) circuit board protection mechanism according to an embodiment of the present invention (flange rib bending forming);

3 is a cross-sectional view of a multi-layer (two-layer) circuit board protection mechanism according to an embodiment of the present invention (flange rib bending forming);

4 is a schematic structural view of a multi-layer (two-layer) circuit board protection mechanism according to an embodiment of the present invention (a rib forming process with a rib);

5 is a cross-sectional view of a multi-layer (two-layer) circuit board protection mechanism according to an embodiment of the present invention (flange rib forming, with ribs);

6 is a schematic structural view of a multi-layer (two-layer) circuit board protection mechanism according to an embodiment of the present invention (a rib stretch forming);

7 is a cross-sectional view of a multi-layer (two-layer) circuit board protection mechanism according to an embodiment of the present invention (flange rib stretch forming);

8 is a schematic structural view of a multi-layer (two-layer) circuit board protection mechanism according to an embodiment of the present invention (folding ribs folded in half);

Figure 9 is a cross-sectional view of a multi-layer (two-layer) circuit board protection mechanism in accordance with an embodiment of the present invention (flap ribs folded in half);

10 is a schematic structural view of a multi-layer (two-layer) circuit board protection mechanism according to an embodiment of the present invention (a limiting protrusion and a limiting hole matching);

11 is a cross-sectional view of a multi-layer (two-layer) circuit board protection mechanism according to an embodiment of the present invention (a limiting protrusion, a limiting hole matching);

12 is a schematic structural view (inter-insertion structure) of a multi-layer (two-layer) circuit board protection mechanism according to an embodiment of the present invention;

Figure 13 is a cross-sectional view (inter-insertion structure) of a multi-layer (two-layer) circuit board protection mechanism in accordance with an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings.

Referring to FIG. 1 and FIG. 2, an embodiment of the present invention provides a multi-layer circuit board protection mechanism including a first circuit board 1 and a second circuit board 2 and disposed between the first circuit board 1 and the second circuit board 2. The connecting device 3, the first circuit board 1 is adjacent to the second circuit board 2 and arranged in parallel, the first circuit board 1 is covered with a first shielding cover 4, and the second circuit board 2 is covered with a second shielding cover. 5, the first shield 4 and the second shield 5 are located between the first circuit board 1 and the second circuit board 2 and are oppositely disposed. The first shield 4 is provided with a first opening 40, and the second shield 5 is A second opening 50 is defined, and the connecting device 3 is disposed through the first opening 40 and the second opening 50. A limiting structure is disposed between the first shielding cover 4 and the second shielding cover 5. The limiting structure can limit the first shielding cover. 4 and the second shield 5 are relatively moved in a direction parallel to the first circuit board 1. The circuit board may be a PCB (Printed Circuit Board), and the number of layers of the circuit board may be 2, 3, or 4 layers, which is not limited herein.

In the multi-layer circuit board protection mechanism provided by the embodiment of the present invention, since the limiting structure is disposed between the first shielding cover 4 and the second shielding cover 5, the limiting structure can limit the first shielding cover 4 and the second shielding cover 5 to be parallel. Relatively moving in the direction of the first circuit board 1, so that no additional parts need to be added on the first circuit board 1 and the second circuit board 2 to restrict their relative movement in the direction parallel to the first circuit board 1, thereby reducing the first The influence of the layout of the components on the circuit board 1 and the second circuit board 2; since the limiting structure is disposed between the first shield 4 and the second shield 5, the first shield 4 and the second shield 5 can be reduced The small external influence on the radio frequency performance of the first circuit board 1 and the second circuit board 2, whereby the setting of the limit structure has less influence on the radio frequency performance of the first circuit board 1 and the second circuit board 2. Therefore, compared with the prior art, the multi-layer circuit board protection mechanism provided by the embodiment of the present invention can limit the relative motion between the shields without affecting the layout of the circuit board and the radio frequency performance, thereby limiting the relationship between the boards. Relative movement occurs, thereby preventing the connection device 3 (such as the BTB connector) between the boards from being damaged due to excessive movement between the boards.

The structure of the first shield 4 and the second shield 5 is not unique. For example, the first shield 4 and the second shield 5 may have the following structure: the first shield 4 includes a first cover, and the first cover a plurality of mesh holes are formed on the body, and a first cover is formed on the first cover, the edge of the first cover is fixedly connected to the first circuit board 1, and the first opening 40 is opened on the first cover; The shielding cover 5 includes a second cover body. The second cover body is formed with a plurality of mesh holes, and the second cover body is formed with a second cover opening. The edge of the second cover opening is fixedly connected with the second circuit board 2, and the second The opening 50 is opened on the second cover.

In addition, as shown in FIG. 2, the first shield 4 and the second shield 5 may also have the following structure: the first screen The cover 4 includes a first cover bottom 41 and a first side plate 42 formed on the periphery of the first cover bottom 41. The first opening 40 is formed on the first cover bottom 41, and the first side plate 42 and the first circuit board 1 The second shield cover 5 includes a second cover bottom 51 and a second side plate 52 formed on the periphery of the second cover bottom 51. The second opening 50 is opened on the second cover bottom 51, and the second side plate 52 is The second circuit board 2 is fixedly connected. Compared with the structure of the first shield cover 4 and the second shield cover 5 having a plurality of mesh structures, the structure shown in FIG. 2 has higher structural strength of the first shield cover 4 and the second shield cover 5, It is easy to be deformed, and when the limiting structure is disposed on the first shield 4 or the second shield 5, it can have sufficient strength to limit the relative movement between the two (ie, in a direction parallel to the first circuit board 1) Relative movement).

Further, the limiting structure is not unique. FIG. 2 and FIG. 3 show a limiting structure. Specifically, the limiting structure includes a flange rib 43 disposed on the edge of the first opening 40, and the flange rib 43 is worn. It is disposed in the second opening 50. When the multilayer circuit board is subjected to the mechanical reliability test, the first circuit board 1 and the second circuit board 2 are relatively moved in the direction parallel to the first circuit board 1, and the second opening 50 acts on the movement of the flange ribs 43. The effect of the limitation further limits the relative movement of the first circuit board 1 and the second circuit board 2 in a direction parallel to the first circuit board 1. Thus, the connecting device 3 (such as the BTB connector) between the first circuit board 1 and the second circuit board 2 is not damaged by the relative movement of the first circuit board 1 and the second circuit board 2. The method of fitting the limit by the flange rib 43 and the second opening 50 is simple in structure, easy to disassemble and convenient to maintain, and does not need to add other parts, which is beneficial to reduce the cost.

Wherein, the flange rib 43 can be formed by bending, as shown in FIG. 2 and FIG. 3, by cutting the first opening 40, and then bending the edge of the first opening 40, thereby forming the flip shown in FIG. Side ribs 43. In order to further enhance the strength of the ribs 43, as shown in FIG. 8 and FIG. 9, the ribs 43 can be folded in half, and the ribs 43 can be strengthened by folding the ribs 43 to reduce the first shield 4 and the second shield. 5 deformation occurring when moving in a direction parallel to the direction of the first circuit board 1.

In addition, as shown in FIG. 6 and FIG. 7, the flange rib 43 may be formed by stretch forming, applying a force to the edge of the first opening 40 using a mold and stretching in the direction of the first shield 4 to form a surrounding first opening. 40 rounded ribs 43 along the edge. The ribs 43 are formed by a process of stretching or bending the material of the first shield 4 itself, which is advantageous in reducing the manufacturing cost.

In order to reduce the deformation of the flange ribs 43 when the first shield 4 and the second shield 5 are relatively moved in a direction parallel to the first circuit board 1, as shown in FIGS. 4 and 5, the flanges 43 and the first A rib 44 is provided at the joint of the cover bottom 41. By providing the reinforcing ribs 44 at the joint of the flanges 43 and the first cover bottom 41, the connection strength between the flanges 43 and the first cover bottom 41 can be increased, and the rigidity of the flanges 43 can be improved, thereby greatly reducing The deformation of the small flange ribs 43 when the first shield 4 and the second shield 5 are relatively moved in the direction parallel to the first circuit board 1 provides better protection for the connecting device 3.

In order to improve the limit effect between the first circuit board 1 and the second circuit board 2, as shown in FIG. 12 and FIG. 13, the first cover bottom 41 has a limit groove 411, and the second cover bottom 51 has a limit. The rib 511 and the limiting rib 511 are inserted into the limiting groove 411. Thus, the second opening 50 of the first shielding cover 4 and the limiting rib 511 of the second shielding cover 5 are inserted into the limiting slot 411 of the first shielding cover 4 . Forming an inter-insertion structure to further restrict the relative movement of the first shield 4 and the second shield 5 in a direction parallel to the first circuit board 1 to improve the relationship between the first circuit board 1 and the second circuit board 2 Limit effect. In addition, the limiting structure may further include a limited position slot 411 formed on the first cover bottom 41, and the second cover bottom 51 is disposed The limiting rib 511, the limiting rib 511 is inserted into the limiting slot 411, and is inserted into the limiting slot 411 through the limiting rib 511. This can also limit the first shielding cover 4 and the second shielding cover 5 to be parallel to the first A board 1 is relatively moved in the direction.

Wherein, the limiting rib 511 is formed by bending, that is, the notch is cut on the second cover bottom 51, and then the edge of the notch is biased to be bent into the limiting rib 511 shown in FIG. The stopper 511 is made by a process of bending the material of the second shield 5 itself, which is advantageous in reducing the manufacturing cost.

FIG. 10 and FIG. 11 show another limiting structure. Specifically, the limiting structure includes a limiting protrusion 412 disposed on the first cover bottom 41 and a limiting hole 512 formed on the second cover bottom 51. The limiting protrusion 412 is inserted into the limiting hole 512. Thus, the limiting hole 512 can limit the movement of the limiting protrusion 412 in a direction parallel to the first circuit board 1 , thereby restricting the relative movement of the first shielding cover 4 and the second shielding cover 5 , thereby limiting the first circuit. The relative movement of the board 1 and the second circuit board 2, the connecting device 3 is not damaged by the relative movement of the first circuit board 1 and the second circuit board 2.

Between the first shield 4 and the second shield 5, if the limiting protrusion 412 and the limiting hole 512 are one, when the first shield 4 and the second shield 5 are parallel to the first circuit board 1 When the directions are relatively moved, the limit protrusions 412 are easily deformed. In order to reduce the deformation of the limiting protrusion 412, thereby improving the limiting effect between the first circuit board 1 and the second circuit board 2, as shown in FIG. 10, the limiting protrusions 412 are multiple, and multiple limit positions are provided. The protrusions 412 are disposed around the first opening 40. The plurality of limiting holes 512 are disposed around the second opening 50 and are in one-to-one correspondence with the plurality of limiting protrusions 412. Thus, the plurality of limiting protrusions 412 are matched with the plurality of limiting holes 512 in one-to-one correspondence. When the first shielding cover 4 and the second shielding cover 5 are relatively moved in the direction parallel to the first circuit board 1, the limiting protrusions The force of the 412 can be greatly reduced, and the deformation occurring is also greatly reduced, thereby facilitating the improvement of the limit effect between the first circuit board 1 and the second circuit board 2; since the connecting device 3 passes through the first opening 40 and The second opening 50 is disposed, and the plurality of limiting protrusions 412 are disposed around the first opening 40, and the plurality of limiting holes 512 are disposed around the second opening 50, so that the first shielding cover 4 and the second shielding cover can be more accurately 5 performing a limit to prevent the inner walls of the first opening 40 and the second opening 50 from coming into contact with the connecting device 3 when the first shield 4 and the second shield 5 are relatively moved in a direction parallel to the first circuit board 1 , and more Conducive to the protection of the connecting device 3. The limiting hole 512 can be a closed hole, that is, the limiting hole 512 is not connected to the second opening 50. Alternatively, the limiting hole 512 can also be connected to the second opening 50 to form an open hole.

Referring to FIG. 11 , the limiting protrusion 412 is a hollow structure, and the limiting protrusion 412 is formed by stretching, that is, applying a force to the first cover bottom 41 by a mold and stretching in the direction of the second shielding cover 5 , and then stretching into The limiting projection 412 is shown in FIG. The limiting protrusion 412 may be a hollow cylinder or a hollow polygonal convex hull structure, which is not limited herein.

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

A multi-layer circuit board protection mechanism includes a first circuit board and a second circuit board, and a connecting device disposed between the first circuit board and the second circuit board, the first circuit board and the second circuit board Adjacent and parallel, the first circuit board is provided with a first shielding cover, and the second circuit board is provided with a second shielding cover, and the first shielding cover and the second shielding cover are located at the a first opening is formed between the first circuit board and the second circuit board, a first opening is defined in the first shielding cover, and a second opening is defined in the second shielding cover, and the connecting device passes through the first An opening and a second opening are disposed, wherein a limiting structure is disposed between the first shielding cover and the second shielding cover, and the limiting structure limits the first shielding cover and the second shielding cover to be parallel Relatively moving in the direction of the first circuit board.
The multi-layer circuit board protection mechanism according to claim 1, wherein the first shield cover comprises a first cover bottom and a first side plate formed on a peripheral edge of the first cover bottom, the first Openings are formed on the first cover bottom, the first side plate is fixedly connected to the first circuit board; the second shielding cover includes a second cover bottom and a peripheral edge formed on the fourth cover bottom The second side plate is opened on the second cover bottom, and the second side plate is fixedly connected to the second circuit board.
The multi-layer circuit board protection mechanism according to claim 2, wherein the limiting structure comprises a flange rib disposed on the edge of the first opening, and the flange is fitted into the second opening .
The multi-layer circuit board protection mechanism according to claim 2 or 3, wherein a finite slot is formed on the first cover bottom, and a limiting rib is disposed on the second cover bottom, and the limiting rib is matched The utility model is disposed in the limiting slot.
The multi-layer circuit board protection mechanism according to claim 2, wherein the limiting structure comprises a limiting protrusion disposed on the first cover bottom and a limit formed on the second cover bottom And a limiting hole, the limiting protrusion is inserted into the limiting hole.
The multi-layer circuit board protection mechanism according to claim 5, wherein the plurality of limiting protrusions are disposed, and the plurality of limiting protrusions are disposed around the first opening; And a plurality of the limiting holes are disposed around the second opening and are in one-to-one correspondence with the plurality of the limiting protrusions.
The multilayer circuit board protection mechanism according to claim 3, wherein the flange is formed by bending or stretching.
The multi-layer circuit board protection mechanism according to claim 3, wherein a reinforcing rib is provided at a joint of the flange and the first cover.
The multi-layer circuit board protection mechanism according to claim 4, wherein the limiting rib is formed by bending.
The multi-layer circuit board protection mechanism according to claim 5, wherein the limiting protrusion is a hollow structure, and the limiting protrusion is formed by stretching.