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EP-4025018-B1 - PRINTED CIRCUIT BOARD AND COMMUNICATION APPARATUS

EP4025018B1EP 4025018 B1EP4025018 B1EP 4025018B1EP-4025018-B1

Inventors

  • LI, WENLIANG
  • WANG, ZEWEN
  • LIU, Xusheng
  • XIE, Ertang
  • YAN, ZHONG
  • XIONG, Wang

Dates

Publication Date
20260506
Application Date
20200820

Claims (15)

  1. A printed circuit board (1), comprising: a plurality of conducting layers (11) and a plurality of dielectric layers (12) alternately stacked in a depth direction of the printed circuit board (1), the depth direction being perpendicular to a layer plane of the layers (11, 12); a connector insertion area (2), wherein a plurality of rows of crimping holes (40, 50) are arranged in the connector insertion area (2), the crimping holes (40, 50) extending in the depth direction through the layers of the printed circuit board (1) and the rows respectively extending in a row arrangement direction in the layer plane and placed next to each other in a first direction (B) perpendicular to the row arrangement direction in the layer plane, each row of crimping holes (40) comprises at least two pairs of signal crimping holes (40) arranged at intervals in the row arrangement direction, and each pair of signal crimping holes (40) comprises two signal crimping holes (40); and in the row arrangement direction of the crimping holes (40), at least one ground crimping hole (50) is arranged on either side of each pair of signal crimping holes (40), wherein a depth of the ground crimping hole (50) in the depth direction is greater than or equal to a depth of the signal crimping hole (40) in the depth direction, the ground crimping hole (50) comprises a main hole (51) and a shielding component (50a) on at least one side of the main hole (51) in the first direction (B), a part (54a) of a side wall of the main hole (51) is a part of a side wall of the shielding component (50a), and a sum of lengths of the main hole (51) and the shielding component (50a) in the first direction (B) is greater than a length of the signal crimping hole (40) in the first direction (B).
  2. The printed circuit board (1) according to claim 1, wherein a first metal plating layer (52) is disposed on an internal surface of the main hole (51).
  3. The printed circuit board (1) according to claim 2, wherein the shielding component (50a) comprises an auxiliary hole (54) arranged in the printed circuit board (1), the part of the side wall of the main hole (51) is a first part (54a) of a side wall of the auxiliary hole (54), and a second metal plating layer (55) is disposed on an internal surface of a part of the side wall of the auxiliary hole (54) other than the first part (54a) of the side wall of the auxiliary hole (54).
  4. The printed circuit board (1) according to claim 3, wherein the auxiliary hole (54) is filled with resin or green oil.
  5. The printed circuit board (1) according to claim 3, wherein the auxiliary hole (54) is a crescent-shaped hole, a circular hole, an elliptical hole, a strip-shaped hole, or a runway-shaped hole.
  6. The printed circuit board (1) according to claim 1, wherein the shielding component (50a) comprises a plurality of first metal layers (52) and a plurality of second metal layers (55) that are alternately stacked, wherein the first metal layer (52) is an area of each conducting layer (11) that is located in the connector insertion area (2) in the printed circuit board (1), and the second metal layer (55) is formed by an area of each dielectric layer (12) in the connector insertion area (2) in the printed circuit board (1) through a displacement reaction, wherein the area of each conducting layer (11) corresponds to the area of each dielectric layer (12) in a thickness direction of the printed circuit board (1).
  7. The printed circuit board (1) according to any one of claims 1 to 6, wherein the ground crimping hole (50) comprises two shielding components (50a), and the two shielding components (50a) are on two sides of the main hole (51) in the first direction (B).
  8. The printed circuit board (1) according to any one of claims 1 to 6, wherein the ground crimping hole (50) comprises at least three shielding components (50a), and the at least three shielding components (50a) are arranged at equal intervals around the main hole (51).
  9. The printed circuit board (1) according to any one of claims 1 to 6, wherein a main hole plate (53) is disposed on the periphery of the main hole (51), and an auxiliary hole plate (56) is disposed on the periphery of the shielding component (50a).
  10. The printed circuit board (1) according to any one of claims 1 to 6, wherein in two adjacent rows of crimping holes (40), in the first direction, any pair of signal crimping holes (40) in a current row and any pair of signal crimping holes (40) in a next row are staggered, and a ground crimping hole (50) in the current row and a ground crimping hole (50) in the next row are staggered.
  11. The printed circuit board (1) according to any one of claims 1 to 10, wherein at least one first metal plating layer (52) is made of copper foil.
  12. The printed circuit board (1) according to any one of claims 1 to 11, wherein at least one dielectric layer (12) is made of resin or glass fiber.
  13. The printed circuit board (1) according to any one of claims 1 to 12, wherein the first metal plating layer (52) is formed through electroplating, evaporation deposition, sputtering, chemical plating, or vapor deposition.
  14. The printed circuit board (1) according to any one of claims 1 to 13, wherein the main hole (51) is a circular hole, an elliptical hole, or an oblate hole.
  15. A communications device, comprising the printed circuit board (1) according to any one of claims 1 to 14 and a connector (20) that fits with the printed circuit board (1), wherein a signal crimping pin in the connector (20) is inserted into a signal crimping hole (40) of the printed circuit board (1), and a ground crimping pin in the connector (20) is inserted into a ground crimping hole (50).

Description

This application claims priority to Chinese Patent Application No. 201910864686.1, filed with the China National Intellectual Property Administration on September 9, 2019 and entitled "PRINTED CIRCUIT BOARD AND COMMUNICATIONS DEVICE". TECHNICAL FIELD Embodiments of this application relate to the field of circuit board technologies, and in particular, to a printed circuit board and a communications device. PATENT LITERATURE The following documents form part of the background prior art. US 2007/230149 discloses a main printed circuit board with connectors for receiving other printed circuit boards that comprise aligned crimping holes with reduced crosstalk by providing additional ground holes which provide additional return paths for signals. The ground crimping holes are arranged on either side of a pair of signal crimping holes and provide shielding to the signal crimping holes. US 2005/130480 discloses an elongated hole made by overlapping bores that are plated together and form together a shielding elongated hole. WO 2008/113767 discloses two metal filled holes separated by an isolation opening drilled between the metal filled holes that are filled by an isolating material. CN 110 730 558 discloses a main printed circuit board with crimping holes for receiving a mating connector and comprises aligned crimping holes with reduced crosstalk by providing shielding ground holes. The ground crimping holes are arranged on either side of a pair of signal crimping holes and provide shielding to the signal crimping holes. BACKGROUND A printed circuit board (Printed Circuit Board, PCB for short) is an important electronic component in an electronic device, and is a carrier for electrical connections between electronic parts and components. For example, a plurality of printed circuit boards connected to each other generally need to be disposed in a communications device. In a common manner of connecting a plurality of printed circuit boards, as shown in FIG. 1, one printed circuit board is used as a backplane 10, and the remaining printed circuit boards each are used as a daughter board 30. The backplane 10 and the daughter board 30 are connected through a connector 20. Either of the backplane 10 and the daughter board 30 is provided with signal crimping holes and ground crimping holes that are connected to the connector 20. Signal crimping pins in the connector 20 are inserted into the signal crimping holes, and ground crimping pins are inserted into the ground crimping holes. The backplane 10 and the daughter board 30 may be connected through the connector 20. A manner of arranging the signal crimping holes and the ground crimping holes on the backplane 10 or the daughter board 30 is shown in FIG. 2. Ground crimping holes 50 are on two sides of each pair of signal crimping holes 40. When a signal is transmitted between the backplane 10 and the daughter board 30 through the connector 20, an electromagnetic field between two adjacent pairs of signal crimping holes 40 is shielded by the ground crimping holes 50, to reduce signal crosstalk between the two adjacent pairs of signal crimping holes 40. However, as a signal channel rate and density of the communications device continuously increase, the two adjacent pairs of signal crimping holes 40 keep approaching. Consequently, it is difficult to achieve an ideal electromagnetic shielding effect by using the foregoing ground crimping holes 50, and severe signal crosstalk still exists between the two adjacent pairs of signal crimping holes 40. In the present disclosure whenever the unit "mil" is referred to, it should be noted that the skilled person can easily convert the same into the unit "millimeter" recognized in international practice by using the well known formula "1 mil = 0.0254 millimeter". SUMMARY Embodiments of this application provide a printed circuit board and a communications device, to reduce signal crosstalk between two adjacent pairs of signal crimping holes. A first aspect of embodiments of this application provides a printed circuit board, including a connector insertion area. A plurality of rows of crimping holes are arranged in the connector insertion area, 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. In a row arrangement direction of the crimping holes, at least one ground crimping hole is arranged on either side of each pair of signal crimping holes. A depth of the ground crimping hole is greater than or equal to a depth of the signal crimping hole, the ground crimping hole includes a main hole and a shielding component on at least one side of the main hole, a part of a side wall of the main hole is a part of a side wall of the shielding component, a sum of lengths of the main hole and the shielding component in a first direction is greater than a length of the signal crimping hole in the first direction, and the fir