阅读说明：本技术 印刷电路板及通信设备 (Printed circuit board and communication device ) 是由 李文亮 汪泽文 刘旭升 谢二堂 颜忠 熊旺 于 2019-09-09 设计创作，主要内容包括：本申请实施例提供了一种印刷电路板及通信设备,涉及电路板技术领域,用于解决相邻的两对信号压接孔之间仍存在较严重的信号串扰的问题。该印刷电路板包括连接器插接区,连接器插接区内设置有多行压接孔,每行压接孔包括至少两对信号压接孔,每对信号压接孔包括两个信号压接孔；沿压接孔的行排列方向,每对信号压接孔的两侧各设置有至少一个接地压接孔,接地压接孔的深度大于或等于信号压接孔的深度,所述接地压接孔包括主孔和位于主孔至少一侧的屏蔽部件,主孔的部分侧壁为屏蔽部件的侧壁的一部分；主孔与屏蔽部件在第一方向上的长度之和大于信号压接孔在第一方向上的长度。所述通信设备包括上述印刷电路板和与其配合的连接器。(The embodiment of the application provides a printed circuit board and communication equipment, relates to the technical field of circuit boards, and is used for solving the problem that more serious signal crosstalk still exists between two adjacent pairs of signal crimping holes. The printed circuit board comprises a connector plugging area, wherein a plurality of rows of crimping holes are arranged in the connector plugging area, each row of crimping holes comprises at least two pairs of signal crimping holes, and each pair of signal crimping holes comprises two signal crimping holes; along the row arrangement direction of the crimping holes, two sides of each pair of signal crimping holes are respectively provided with at least one grounding crimping hole, the depth of each grounding crimping hole is greater than or equal to that of each signal crimping hole, each grounding crimping hole comprises a main hole and a shielding component positioned on at least one side of the main hole, and part of the side wall of each main hole is part of the side wall of the shielding component; the sum of the lengths of the main hole and the shielding member in the first direction is greater than the length of the signal crimping hole in the first direction. The communication device comprises the printed circuit board and a connector matched with the printed circuit board.)

1. A printed circuit board is characterized by comprising a connector plugging area, wherein a plurality of rows of crimping holes are arranged in the connector plugging area, each row of crimping holes comprises at least two pairs of signal crimping holes which are arranged at intervals, and each pair of signal crimping holes comprises two signal crimping holes;

along the row arrangement direction of the signal crimping holes, at least one grounding crimping hole is arranged on each of two sides of each pair of signal crimping holes, the depth of each grounding crimping hole is larger than or equal to that of each signal crimping hole, each grounding crimping hole comprises a main hole and a shielding component positioned on at least one side of the main hole, and partial side wall of each main hole is a part of the side wall of the shielding component; the sum of the lengths of the main hole and the shielding member in a first direction, which is a direction perpendicular to the direction in which the rows of the crimping holes are arranged in the same plane, is greater than the length of the signal crimping holes in the first direction.

2. The printed circuit board of claim 1, wherein the inner side of the main hole is provided with a first metal plating layer.

3. The printed circuit board of claim 2, wherein the shielding member includes a sub-hole provided in the printed circuit board, a part of the side wall of the main hole is a first part of the side wall of the sub-hole, and an inner side surface of the side wall of the sub-hole except for the first part is provided with a second metal plating layer.

4. The printed circuit board according to claim 3, wherein the hole of the sub-hole is filled with resin or green oil.

5. The printed circuit board of claim 3, wherein the auxiliary hole is a crescent, circular, elliptical, elongated, or racetrack hole.

6. The printed circuit board of claim 1, wherein the shielding member comprises a plurality of first metal layers and a plurality of second metal layers stacked alternately, wherein the first metal layers refer to partial regions of the conductive layers in the connector insertion area of the printed circuit board, and the second metal layers are formed by performing a displacement reaction on partial regions of the dielectric layers in the connector insertion area of the printed circuit board, and the partial regions of the conductive layers and the dielectric layers correspond to each other in a thickness direction of the printed circuit board.

7. The printed circuit board of any of claims 1-6, wherein the ground crimp hole includes two of the shielding members, the two shielding members being located on either side of the main hole in the first direction.

8. A printed circuit board according to any of claims 1-6, wherein the ground crimp hole comprises at least three of the shielding members, the at least shielding members being arranged at equal intervals around the main hole.

9. A printed circuit board according to any of claims 1-6, characterized in that the periphery of the main hole is provided with a main hole disc and the periphery of the shielding member is provided with an auxiliary hole disc.

10. The printed circuit board according to any one of claims 1 to 6, wherein, in two adjacent rows of the crimping holes, in the first direction, any pair of signal crimping holes located in an upper row is disposed to be offset from any pair of signal crimping holes located in a lower row, and the ground crimping holes located in the upper row is disposed to be offset from the ground crimping holes located in the lower row.

11. A printed circuit board is characterized by comprising a connector plugging area, wherein a plurality of rows of crimping holes are arranged in the connector plugging area, each row of crimping holes comprises at least two pairs of signal crimping holes which are arranged at intervals, and each pair of signal crimping holes comprises two signal crimping holes;

along the row arrangement direction of the signal crimping holes, at least one grounding crimping hole is arranged on each of two sides of each pair of signal crimping holes, the depth of each grounding crimping hole is larger than or equal to that of each signal crimping hole, and each grounding crimping hole comprises a main body part and an auxiliary part communicated with the main body part; the inner side surface of the auxiliary part is provided with a third metal plating layer, the sum of the lengths of the main body part and the auxiliary part in a first direction is larger than the length of the signal crimping holes in the first direction, and the first direction is a direction which is in the same plane with the row arrangement direction of the crimping holes and is perpendicular to the row arrangement direction of the crimping holes.

12. The printed circuit board of claim 11, wherein the inner side surface of the main body portion is provided with a fourth metal plating layer, and the fourth metal plating layer is connected to the third metal plating layer.

13. The printed circuit board according to claim 11 or 12, wherein the cross-sectional shape of the ground crimping hole is peanut-shaped or dumbbell-shaped with a plane parallel to the printed circuit board as a cross-section.

14. The printed circuit board according to claim 11 or 12, wherein a periphery of the ground crimping hole is provided with a hole disk.

15. A communication apparatus comprising a printed circuit board according to any one of claims 1 to 14, and a connector to which the printed circuit board is mated, wherein a signal press pin of the connector is inserted into a signal press hole of the printed circuit board, and a ground press pin of the connector is inserted into the ground press hole.

Technical Field

The embodiment of the application relates to the technical field of circuit boards, in particular to a printed circuit board and communication equipment.

Background

Printed Circuit Boards (PCBs) are important electronic components in electronic devices, and carriers for electrical connection of electronic components, and for example, in communication devices, it is generally necessary to provide a plurality of interconnected Printed Circuit boards. In a common multiple printed circuit board interconnection method, as shown in fig. 1, one of the printed circuit boards is used as a backplane 10, and the other printed circuit boards are used as daughter boards 30, and the backplane 10 and the daughter boards 30 are connected by a connector 20.

The backplane 10 and the daughter board 30 are both provided with a signal crimping hole and a ground crimping hole which are connected with the connector 20, a signal crimping pin in the connector 20 is inserted in the signal crimping hole, a ground crimping pin is inserted in the ground crimping hole, and the backplane 10 and the daughter board 30 can be interconnected through the connector 20. The signal press-fit holes and ground press-fit holes on the back plane 10 or on the sub-plane 30 are arranged as shown in fig. 2, wherein the ground press-fit holes 50 are located on both sides of each pair of signal press-fit holes 40. When signals are transmitted between the back board 10 and the daughter board 30 through the connector 20, the ground crimping holes 50 are used to shield electromagnetic fields between two adjacent pairs of signal crimping holes 40, thereby reducing signal crosstalk between the two adjacent pairs of signal crimping holes 40.

However, as the signal channel rate and density of the communication device are increased, the distance between two adjacent pairs of signal crimping holes 40 is close to and decreased, which makes it difficult to obtain an ideal electromagnetic shielding effect by using the grounding crimping hole 50, and further causes a relatively serious signal crosstalk between two adjacent pairs of signal crimping holes 40.

Disclosure of Invention

The embodiment of the application provides a printed circuit board and communication equipment, which are used for reducing signal crosstalk between two adjacent pairs of signal crimping holes.

A first aspect of the embodiments of the present application provides a printed circuit board, including a connector plugging region, where multiple rows of crimping holes are provided in the connector plugging region, each row of crimping holes includes at least two pairs of signal crimping holes arranged at intervals, and each pair of signal crimping holes includes two signal crimping holes; along the row arrangement direction of the signal crimping holes, at least one grounding crimping hole is arranged on each of two sides of each pair of signal crimping holes, the depth of each grounding crimping hole is larger than or equal to that of each signal crimping hole, each grounding crimping hole comprises a main hole and a shielding component positioned on at least one side of the main hole, and partial side wall of each main hole is a part of the side wall of the shielding component; the sum of the lengths of the main hole and the shielding member in a first direction, which is a direction perpendicular to the direction in which the rows of the crimping holes are arranged in the same plane, is greater than the length of the signal crimping holes in the first direction.

In the printed circuit board provided by the first aspect of the embodiments of the present application, by providing the ground press-connection holes on both sides of each pair of signal press-connection holes, each ground press-connection hole includes a main hole and a shielding member, a part of the side wall of the main hole is a part of the side wall of the shielding member, so that the effective shielding region of the ground press-connection hole at least includes the main hole and the shielding member, and the sum of the lengths of the main hole and the shielding member in the first direction is greater than the length of the signal press-connection hole in the first direction, therefore, compared with the design scheme of the ground press-connection hole having only one main hole in the related design, the effective shielding range of the ground press-connection hole is significantly increased, so that when the signal press-connection pin of the connector is inserted into the two adjacent pairs of signal press-connection holes and a signal passes through, the electromagnetic field between the two adjacent pairs of signal press-connection holes can be shielded by using, thereby, signal crosstalk between two adjacent pairs of signal crimping holes can be reduced.

In one possible embodiment, the inner side of the main bore is provided with a first metallization layer. By adopting the design, on one hand, all conducting layers in the printed circuit board can be electrically interconnected, and the grounding effect is improved; on the other hand, the shielding effect can be further enhanced by the first metal plating layer and the shielding member to be contacted.

In one possible implementation, the shielding component includes a subsidiary hole disposed in the printed circuit board, a part of the side wall of the main hole is a first part of the side wall of the subsidiary hole, and an inner side surface of the other part of the side wall of the subsidiary hole except for the first part is provided with a second metal plating layer.

By adopting the design, the second metal plating layer can further improve the shielding effect and reduce the signal crosstalk between two adjacent pairs of signal compression connection holes.

In one possible implementation, the bore of the accessory bore is filled with a resin or green oil. By adopting the design, on one hand, the surface of the printed circuit board can be ensured to be flat; on the other hand, the resin or the green oil filled in the auxiliary hole enhances the strength of the side wall of the auxiliary hole and improves the durability of the grounding press connection hole.

In one possible implementation, the auxiliary hole is a crescent, a circular, an elliptical, an elongated or a racetrack hole.

In one possible implementation manner, the shielding member includes a plurality of first metal layers and a plurality of second metal layers that are alternately stacked, where the first metal layer refers to a partial region of each conductive layer in the printed circuit board located in the connector insertion area, and the second metal layer is formed by performing a displacement reaction on a partial region of each dielectric layer in the printed circuit board located in the connector insertion area, where the partial region of each conductive layer and the partial region of each dielectric layer correspond to each other in a thickness direction of the printed circuit board.

With the above design, the shield member has a part of the printed circuit board, i.e., the shield member and the printed circuit board are of an integral structure, so that the overall strength of the printed circuit board can be ensured.

In one possible implementation, the ground press-fit hole includes two shielding members, and the two shielding members are located on both sides of the main hole in the first direction.

In a possible implementation manner, the ground press-fit hole includes at least three shielding members, and the at least shielding members are arranged at equal intervals around the main hole.

In a possible implementation, the periphery of the main hole is provided with a main hole disc, and the periphery of the shielding part is provided with an auxiliary hole disc. By adopting the design, the main hole disc and the auxiliary hole disc are utilized, the grounding area of the printed circuit board can be increased, and the grounding effect of the printed circuit board is improved.

In one possible implementation manner, in two adjacent rows of the crimping holes, along the first direction, any pair of signal crimping holes located in the upper row is arranged to be offset from any pair of signal crimping holes located in the lower row, and the ground crimping hole located in the upper row is arranged to be offset from the ground crimping hole located in the lower row.

By adopting the design, on one hand, the distance between two rows of signal crimping holes which are adjacent up and down can be increased, so that the signal crosstalk between two pairs of signal crimping holes which are adjacent up and down in two adjacent rows is reduced; on the other hand, the shape and distribution of the electromagnetic field between two pairs of signal crimping holes adjacent up and down in two adjacent rows can be further changed, and then the signal crosstalk between two pairs of signal crimping holes adjacent up and down in two adjacent rows is reduced.

A second aspect of the embodiments of the present application provides another printed circuit board, including a connector plugging region, where multiple rows of crimping holes are disposed in the connector plugging region, each row of crimping holes includes at least two pairs of signal crimping holes disposed at intervals, and each pair of signal crimping holes includes two signal crimping holes; along the row arrangement direction of the signal crimping holes, at least one grounding crimping hole is arranged on each of two sides of each pair of signal crimping holes, the depth of each grounding crimping hole is larger than or equal to that of each signal crimping hole, and each grounding crimping hole comprises a main body part and an auxiliary part communicated with the main body part; the inner side surface of the auxiliary part is provided with a third metal plating layer, the sum of the lengths of the main body part and the auxiliary part in a first direction is larger than the length of the signal crimping holes in the first direction, and the first direction is a direction which is in the same plane with the row arrangement direction of the crimping holes and is perpendicular to the row arrangement direction of the crimping holes.

In the printed circuit board provided by the second aspect of the embodiments of the present application, the ground press-connecting holes are disposed on two sides of each pair of signal press-connecting holes, each ground press-connecting hole includes a main body portion and an attachment portion communicating with the main body portion, and the inner side surface of the attachment portion is provided with the third metal plating layer, so that the effective shielding region of the ground press-connecting hole at least includes the main body portion and the third metal plating layer, and the sum of the lengths of the main body portion and the attachment portion in the first direction is greater than the length of the signal press-connecting hole in the first direction, therefore, compared with the design scheme of the ground press-connecting hole having only one main hole in the related design, the effective shielding range of the ground press-connecting hole is significantly increased, so that when the signal press-connecting pin of the connector is inserted into the two adjacent pairs of signal press-connecting holes and a signal passes through, the electromagnetic field between the two adjacent pairs of signal, thereby, signal crosstalk between two adjacent pairs of signal crimping holes can be reduced.

In a possible implementation manner, the inner side surface of the main body part is provided with a fourth metal plating layer, and the fourth metal plating layer is connected with the third metal plating layer. By adopting the design, the signal shielding effect of the main body part between two adjacent pairs of signal compression joint holes can be improved, and meanwhile, the conductive layers in the printed circuit board can be electrically interconnected, so that the grounding effect is improved.

In one possible implementation, the cross-sectional shape of the ground crimping hole is peanut-shaped or dumbbell-shaped, taking a plane parallel to the printed circuit board as a cross section.

In a possible implementation manner, the periphery of the grounding pressure connection hole is provided with a hole disc. By adopting the design, the hole disc on the periphery of the grounding compression joint hole is utilized, so that the grounding area of the printed circuit board can be increased, and the grounding effect of the printed circuit board is improved.

A third aspect of the embodiments of the present application provides a communication device, including the printed circuit board provided in the above embodiments, and a connector that is mated with the printed circuit board, a signal crimping pin of the connector is inserted into a signal crimping hole of the printed circuit board, and a ground crimping pin of the connector is inserted into the ground crimping hole.

The communication device comprises the printed circuit board according to the first and second aspects, and therefore has the advantages of the printed circuit board, which is not described herein again.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic illustration of a plurality of printed circuit board interconnections in a related design;

FIG. 2 is a schematic diagram of the signal and ground crimp holes of the related art;

FIG. 3 is a cross-sectional view of a printed circuit board provided by an embodiment of the present application;

fig. 4 is a front view of a printed circuit board provided by an embodiment of the present application;

FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4;

FIG. 6 is an arrangement of signal press contact holes and ground press contact holes in a connector receiving area according to one embodiment of the present invention;

FIG. 7 is a cross-sectional view of the ground crimp hole of FIG. 6;

FIG. 8 is another arrangement of signal press bond holes and ground press bond holes in a connector receiving area according to one embodiment of the present invention;

FIG. 9 is a cross-sectional view of the ground crimp hole of FIG. 8;

FIG. 10 is another layout of signal press bond holes and ground press bond holes in a connector receiving area according to one embodiment of the present invention;

FIG. 11 is an arrangement of signal press contact holes and ground press contact holes in a connector receiving area according to a second embodiment of the present application;

FIG. 12 is a cross-sectional view of the ground crimp hole of FIG. 11;

FIG. 13 is a cross-sectional view of another ground crimp hole according to the second embodiment of the present application;

FIG. 14 is a cross-sectional view of the ground crimp hole of FIG. 13 with a metal plating disposed therein;

FIG. 15 is a schematic illustration of signal crosstalk in a related design;

FIG. 16 is a schematic diagram of the near end crosstalk obtained for the simulation of FIG. 15;

FIG. 17 is a schematic illustration of far end crosstalk obtained for the simulation of FIG. 15;

FIG. 18 is a schematic illustration of signal crosstalk for the embodiment shown in FIG. 7;

FIG. 19 is a schematic diagram of the near end crosstalk obtained for the simulation of FIG. 18;

FIG. 20 is a schematic illustration of the far end crosstalk obtained for the simulation of FIG. 18;

FIG. 21 is a schematic illustration of signal crosstalk in the embodiment of FIG. 9;

FIG. 22 is a schematic diagram of the near end crosstalk obtained for the simulation of FIG. 21;

fig. 23 is a schematic diagram of far-end crosstalk obtained for the simulation of fig. 21.

Description of reference numerals:

1: a printed circuit board; 2: a connector insertion area;

11: a conductive layer; 12: a dielectric layer;

10: a back plate; 20: a connector;

30: a daughter board; 40: a signal crimping hole;

50: a ground crimping hole; 50 a: a shielding member;

51: a main hole; 52: a first metal plating layer;

53: a main orifice plate; 54: an attachment hole;

54 a: a first portion; 55: a second metal plating layer;

56: an auxiliary hole disc; 61: a main body portion;

62: a fourth metal plating layer; 63: a body portion orifice plate;

64: an attachment portion; 65: a third metal plating layer;

66: an auxiliary hole disc; 61 a: a first side wall;

64 a: a second side wall.

Detailed Description

In order to make the aforementioned objects, features and advantages of the embodiments of the present application more comprehensible, embodiments of the present application are described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The printed circuit board provided by the embodiment of the application can be a single-layer board and can also be a multi-layer board. For example, as shown in fig. 3, the printed circuit board 1 is a multilayer board including a plurality of conductive layers 11 and a plurality of dielectric layers 12, the plurality of conductive layers 11 and the plurality of dielectric layers 12 being alternately stacked. The conductive layer 11 is generally made of copper foil, and is used to constitute a circuit in a printed circuit board; the dielectric layer 12 is generally made of resin or glass fiber, etc. for electrically isolating the adjacent two conductive layers 11.

In order to realize the interconnection between the printed circuit boards, referring to fig. 4, the printed circuit board 1 is usually provided with the connector lands 2, and the positions of the connector lands 2 in the printed circuit board 1 are not limited, for example, the connector lands 2 may be located in the four corner regions or the middle region of the printed circuit board 1. Multiple rows of crimping holes are provided in the connector receiving area 2, each row comprising at least two pairs of signal crimping holes 40 spaced apart, each pair of signal crimping holes 40 comprising two signal crimping holes 40, for example, in the embodiment shown in fig. 4, three rows of crimping holes are provided in the connector receiving area 2, each row comprising two pairs of signal crimping holes 40, each pair of signal crimping holes being used to transmit differential signals.

At least one grounding hole 50 is provided on each side of each pair of signal crimping holes 40 in the same row of crimping holes, or a grounding hole 50 is provided between any two adjacent pairs of signal crimping holes 40 in the same row of crimping holes, so that the two adjacent pairs of signal crimping holes 40 are separated by the grounding hole 50. The grounding crimping hole 50 is matched with a grounding crimping pin of the connector, so that the grounding crimping pin of the connector is inserted into the grounding crimping hole 50; meanwhile, the electromagnetic field between two pairs of signal crimping holes 40 located at both sides of the ground crimping hole 50 may be shielded by the ground crimping hole 50, thereby reducing signal crosstalk between the adjacent pairs of signal crimping holes 40.

It should be noted that the signal crimping hole 40 may penetrate through the printed circuit board 1 along the thickness direction of the printed circuit board 1, that is, the signal crimping hole 40 is a through hole, and the depth of the signal crimping hole 40 is the same as the thickness of the printed circuit board 1; however, the signal crimping holes 40 are not limited to this, and may not penetrate the printed circuit board 1 in the thickness direction of the printed circuit board 1, that is, the signal crimping holes 40 are blind holes, and the depth of the signal crimping holes 40 is smaller than the thickness of the printed circuit board 1. Similarly, the grounding crimping holes 50 may penetrate the printed circuit board 1 along the thickness direction of the printed circuit board 1, or may not penetrate the printed circuit board 1, and the electromagnetic field between two adjacent pairs of signal crimping holes 40 can be shielded only by ensuring that the depth of the grounding crimping holes 50 is greater than or equal to the depth of the signal crimping holes 40. For example, as shown in fig. 5, the signal crimping hole 40 and the ground crimping hole 50 both penetrate the printed circuit board 1 in the thickness direction of the printed circuit board 1, i.e., the depth of the ground crimping hole 50 and the depth of the signal crimping hole 40 are equal to the thickness of the printed circuit board 1.

In order to reduce the signal crosstalk between two adjacent pairs of signal crimping holes 40, there are various forms of the ground crimping holes 50, which will be exemplified below with reference to the drawings of the specification.