A printed circuit board

Abstract

A printed circuit board is provided with signal holes penetrating through the printed circuit board, the signal holes including a main hole and one or more additional holes, the main hole and the additional holes being parallel to each other, the main hole penetrating from the front surface to the back surface of the printed circuit board, the opening of the additional hole being arranged on the front surface of the printed circuit board, the additional hole being in communication with and partially overlapping the main hole, the distribution direction of the additional hole and the main hole on the printed circuit board being the same as the fish-eye width direction of the connector during plugging, the size of the additional hole and the main hole in the distribution direction matching the fish-eye width, and the depth of the additional hole being greater than the working area length of the compliant pin of the connector. The invention makes full use of the space in other directions of the printed circuit board, and can place multiple isolation holes, while the signal traces do not need to be meandered between the isolation holes and can be led out to the external area of the connector without bending.

Description

Technical Field

[0001] This invention belongs to the field of printed circuit board technology, and specifically relates to a printed circuit board. Background Technology

[0002] like Figure 11 , 11-1 Currently, on printed circuit boards, the holes used to accommodate the fisheye at the end of the connector are formed by drilling in one go; there are also stepped holes formed by drilling two holes on the front and back sides at the same center point of the printed circuit board and splicing them together, which are wider at the top and narrower at the bottom.

[0003] To accommodate the fisheye at the end of the connector, the size of the drill hole on the printed circuit board is generally determined only by the width of the fisheye. Therefore, in the current technology, the size of the drill hole on the printed circuit board is constrained by the width of the connector fisheye.

[0004] For example, for the GF7E connector, the traditional method of drilling holes in printed circuit boards is to use a 0.4mm diameter drill bit to drill holes, and the diameter of the through-hole formed after electroplating is 0.31mm. The traditional PCB drilling method has two main drawbacks. First, the large holes occupy more space, reducing the space available for vias and traces on the PCB. With a wafer pitch of only 2mm, this space must accommodate vias and traces. To achieve optimal crosstalk performance, each differential pair via on the PCB needs more than six vias around it, while the traces must avoid these vias. This results in very limited routing space, requiring the use of the thinnest and shortest possible traces to snake through the limited space between wafers until reaching the connector area. This increases design and manufacturing difficulty and also increases signal loss in the link. Second, the large holes have too low impedance, which is incompatible with the connector and causes signal reflection. If six vias are added to each differential pair to enhance shielding, the impedance of the differential pair vias can drop to as low as 80 ohms, which is too low compared to the 90 ohms impedance of the connector body. Summary of the Invention

[0005] To address the technical problems of large holes occupying the space for isolation holes and traces, and the low impedance of large holes in existing printed circuit boards, the present invention provides a printed circuit board.

[0006] The technical scheme is adopted in the present application, and the technical scheme is as follows: a printed circuit board is provided, both sides of the printed circuit board are signal layers, a plurality of ground layers are arranged in a superimposed manner between the two signal layers, one side of the printed circuit board is set as a front side, and the other side is set as a back side; the front side of the printed circuit board is used for plugging a connector; a signal hole penetrating through the printed circuit board is arranged on the printed circuit board; the signal hole comprises a main hole and at least one additional hole; the extending direction of the main hole is parallel to the extending direction of the additional hole; the main hole penetrates through the front side to the back side of the printed circuit board; the opening of the additional hole is arranged on the front side of the printed circuit board; the additional hole is in communication with and partially overlaps the main hole; the distribution direction of the additional hole and the main hole on the printed circuit board is the same as the fish-eye width direction of the connector during plugging; the size of the signal hole in the distribution direction of the additional hole and the main hole matches the fish-eye width; and the depth of the additional hole is greater than the working area length of the compliant pin of the connector.

[0007] Further, the signal hole is plated with copper to form a signal via hole.

[0008] Further, a surface hole disc in communication with the signal hole is arranged around the signal hole on the front side of the printed circuit board, and the distance between the outer edge of the surface hole disc and the outer edge of the signal hole is greater than 0.1 mm.

[0009] Further, at least one ground hole corresponding to the signal hole is arranged on the printed circuit board, the ground hole penetrates through the printed circuit board, and a ground via hole is formed in the ground hole by electroplating; the ground via hole is in communication with the copper skins of a plurality of ground layers to enhance signal shielding.

[0010] Further, an isolation hole corresponding to the signal hole is arranged on the printed circuit board, the distance between the center of the isolation hole and the center of the signal hole is less than the distance between the center of the ground hole and the center of the signal hole, and the isolation hole is in communication with the copper skins of a plurality of ground layers to enhance signal shielding.

[0011] Further, an isolation disc is arranged around the signal hole, the isolation disc overlaps at least one isolation hole or does not overlap the isolation hole, and when the isolation disc overlaps the isolation hole, the area of each isolation hole located in the area of the isolation disc is less than half of the cross-sectional area of the isolation hole.

[0012] Further, an outgoing layer is arranged on the printed circuit board, the outgoing layer is located between two adjacent ground layers, a signal trace is arranged in the outgoing layer, an outgoing layer hole disc in communication with the signal hole is arranged, the outgoing layer hole disc surrounds the corresponding signal hole, and the outgoing layer hole disc is connected to the corresponding signal trace; the signal trace in the isolation disc has a width greater than the signal trace outside the area of the isolation disc.

[0013] Further, a blind hole corresponding to the signal hole is arranged on the back side of the printed circuit board, the depth of the blind hole is greater than 0.25 mm, and hole copper is formed after electroplating of the blind hole.

[0014] Further, the signal hole comprises one main hole and two additional holes, the two additional holes are symmetrically arranged on both sides of the main hole, and the diameter of the additional hole is less than or equal to the diameter of the main hole.

[0015] Further, the signal hole comprises one main hole and two additional holes, the two additional holes are symmetrically arranged on both sides of the main hole, and the diameter of the additional hole is less than or equal to the diameter of the main hole.

[0016] Compared with the prior art, the beneficial effects of the present application are that the signal hole is divided into a main hole and an additional hole, the main hole and the additional hole are distributed according to the width direction of the connector fish eye, the space in other directions of the printed circuit board can be fully utilized, a plurality of isolation holes can be placed, the signal trace does not need to be inserted between the isolation holes in a meandering manner, and can be led out to the external area of the connector without bending; compared with the traditional technology, the inner contour size of the via hole is smaller, the impedance value is higher to match the impedance of the connector, and the signal integrity performance is better.

[0017] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, the content of the specification can be implemented, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a partial top view of the drilled hole of the first embodiment of the present application;

[0019] Figure 1-1 It is a partial top view of the drilled hole of the first embodiment of the present application; Figure 1 It is a top view of a single differential signal unit;

[0020] Figure 2 It is a partial top view of the drilled hole of the second embodiment of the present application;

[0021] Figure 2-1 It is a partial top view of the drilled hole of the second embodiment of the present application; Figure 2 It is a top view of a single differential signal unit;

[0022] Figure 3 It is a partial top view of the drilled hole of the third embodiment of the present application;

[0023] Figure 3-1 It is a partial top view of the drilled hole of the third embodiment of the present application; Figure 3 It is a top view of a single differential signal unit;

[0024] Figure 4 It is a partial top view of the drilled hole of the fourth embodiment of the present application;

[0025] Figure 4-1 It is a partial top view of the drilled hole of the fourth embodiment of the present application; Figure 4 It is a top view of a single differential signal unit;

[0026] Figure 5 This is a partial top view of Embodiment 5 of the present invention after drilling;

[0027] Figure 5-1 for Figure 5 A top view of a single differential signal unit;

[0028] Figure 6 This is a partial top view of Embodiment Six of the present invention after drilling;

[0029] Figure 6-1 for Figure 6 A top view of a single differential signal unit;

[0030] Figure 7 This is a partial top view of Embodiment 7 of the present invention after drilling;

[0031] Figure 7-1 for Figure 7 A top view of a single differential signal unit;

[0032] Figure 8 for Figure 1 Top view of a single differential signal unit after the embodiment has been processed into a finished product;

[0033] Figure 8-1 for Figure 8 Cross-sectional view at the center line of the signal hole;

[0034] Figure 8-2 for Figure 8-1 Enlarged view of point A in the middle;

[0035] Figure 9 for Figure 4 or Figure 5 The top view of a single differential signal unit after processing into a finished product according to the embodiment shown;

[0036] Figure 9-1 for Figure 4 The illustrated embodiment is a cross-sectional view of the center line of the signal hole of a single differential signal unit after it has been processed into a finished product.

[0037] Figure 9-2 for Figure 5 The illustrated embodiment is a cross-sectional view of the center line of the signal hole of a single differential signal unit after it has been processed into a finished product.

[0038] Figure 9-3 for Figure 9-1 Enlarged view of point B in the middle;

[0039] Figure 9-4 for Figure 9-2 Enlarged view of point C in the middle;

[0040] Figure 10 for Figure 1 or Figure 2or Figure 3 The diagram shown is a schematic diagram of the signal hole and the fisheye at the end of the connector before assembly in the embodiment shown.

[0041] Figure 10-1 for Figure 4 or Figure 5 or Figure 6 or Figure 7 The diagram shown is a schematic diagram of the signal hole and the fisheye at the end of the connector before assembly in the embodiment shown.

[0042] Figure 11 This is a schematic diagram of an existing printed circuit board after drilling.

[0043] Figure 11-1 for Figure 11 A top view of a single differential signal unit in the array.

[0044] [Attached image labels]

[0045] 1-Signal hole, 101-Main hole, 102-Additional hole, 2-Signal via, 3-Hole plate, 4-Isolation plate, 5-Isolation hole, 6-Ground hole, 7-Signal trace I, 8-Signal trace II, 9-Signal trace inside isolation plate, 10-Outgoing layer hole plate, 11-Surface layer I, 12-Surface layer II, 13-Inner layer I, 14-Inner layer II, 15-Inner layer III, 16-Inner layer IV, 17-Compliance pin working area, 18-Fish eye, 19-Copper hole. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] A printed circuit board includes multiple signal layers and multiple ground layers, such as Figure 8-1 As shown in Figures 9-1 and 9-2, the signal layer includes surface layer I 11 and surface layer II 12, where surface layer I 11 serves as the connector crimping surface and surface layer II 12 serves as the non-connector crimping surface. Between surface layers I 11 and II 12, multiple ground layers are sequentially stacked from surface layer I 11 to surface layer II 12. These ground layers include inner layer I 13, inner layer II 14, inner layer III 15, and inner layer IV 16. Inner layer I 13 has two layers, inner layer II 14 has four layers, inner layer III 15 has two layers, and inner layer IV 16 has one layer. The connector crimping surface is considered the front side, and the non-connector crimping surface is considered the back side.

[0048] Multiple differential signal units are distributed on the printed circuit board. Each differential signal unit includes a signal via 1, an isolation via 5, and a ground via 6, such as... Figure 8 , 9 As shown. A signal hole 1 is formed by vertical drilling from the front of the printed circuit board. The signal hole 1 is electroplated, and the signal hole 1 after electroplating a layer of copper is called a signal via 2, which is used to accommodate the fisheye 18 of the connector. The end of the connector contact is the compliant pin working area 17, and the fisheye 18 is set in the compliant pin working area 17. The inner layer I 13 is the ground layer through which the compliant pin working area 17 passes.

[0049] After the connector is pressed into the signal via 2 using the fisheye 18, the width direction of the fisheye 18 is compressed and deformed to fit tightly with the signal via 2. Considering that the thickness direction of the connector's fisheye 18 is much smaller than its width direction, and the required dimensional space in the thickness direction is smaller than that in the width direction, the traditional single large circular hole technology can no longer meet the requirements as the signal rate increases. Therefore, the signal hole 1 is divided into a main hole 101 and an auxiliary hole 102. The main hole 101 is a through hole, formed by drilling vertically from the front side of the printed circuit board to the back side of the printed circuit board. The auxiliary hole 102 is a blind hole, formed by drilling vertically from the front side of the printed circuit board. The auxiliary hole 102 is attached to the main hole 101 and communicates with it. The number of auxiliary holes 102 is unlimited, and the depth of the auxiliary hole 102 is greater than the length of the compliant pin working area 17 of the connector. After the signal hole 1 is drilled, a layer of copper is electroplated on it. When drilling the signal hole, the diameter of the drill bit used is smaller than that of the traditional drill bit. The inner contour dimension of the signal via 2 formed is smaller than that of the traditional large circular hole. However, due to the presence of the additional hole, the dimension of the signal hole 1 in one direction is not smaller than that of the traditional large circular hole, and it can accommodate the same size fisheye 18. Each differential signal unit includes two signal holes 1. Because the upper part of each signal hole 1 includes the main hole 101 and the additional hole 102, the upper part of the signal hole 1 is shaped like an "8" or an "O" or an irregular shape of "multi-circular hinge" formed by multiple drilling.

[0050] Each signal hole 1 includes a main hole 101 and at least one auxiliary hole 102. In a preferred embodiment, the diameter of the auxiliary hole 102 is less than or equal to the diameter of the main hole 101, and the distribution direction of the auxiliary holes 102 and the main hole 101 of the same signal hole is the same as the fisheye width direction of the connector during insertion, which is beneficial for the connector contacts to be aligned with the main hole before insertion.

[0051] A surface perforated plate 3 is provided on the surface layer I 11 around the signal via 2, and the distance between the outer edge of the surface perforated plate 3 and the outer edge of the signal via 2 is greater than 0.1 mm.

[0052] In other embodiments, the main hole 101 is back-drilled, that is, a blind hole with an outer diameter larger than that of the signal hole 1 is drilled from the back of the printed circuit board to remove at least 0.25 mm below the surface layer II 12 and within the safe distance range, and then plated with copper to form the hole 19. That is, the depth of the blind hole is greater than 0.25 mm and within the safe depth range of the printed circuit board design standard, such as... Figure 8-1 As shown in Figures 9-1 and 9-2. Inner layer IV 16 serves as the formation in the back-drilling zone, and hole copper 19 passes through inner layer IV 16.

[0053] Each differential signal unit contains two or more ground vias 6, and each signal via 1 corresponds to at least one ground via 6. The ground via 6 penetrates the printed circuit board. After a layer of copper is plated inside the ground via 6, it is called a ground via. The ground via connects the copper of multiple ground layers to enhance signal shielding. Both signal via 2 and ground via 6 are used to accommodate the fisheye at the end of the contact in the connector.

[0054] Each differential signal unit contains multiple isolation holes 5. Due to the presence of additional hole structures, each signal hole 1 can be provided with multiple isolation holes 5. In this embodiment, six isolation holes 5 are provided. The distance between the center of the isolation hole 5 and the center of the signal hole 1 is less than the distance between the center of the ground hole 6 and the center of the signal hole 1. The isolation holes 5 connect the copper sheets of multiple ground layers to enhance signal shielding.

[0055] The unconnected area between the signal via 2 and the copper foil of the two inner layers III15 is an isolation disk 4. The isolation disk 4 can be circular, elliptical, rectangular, or other irregular shapes. In this embodiment, the two isolation holes 5 in the differential signal unit are each partially located in their respective isolation disks 4, and the area of ​​the isolation hole 5 within the isolation disk 4 is less than half of its cross-sectional area. In other embodiments, the isolation holes 5 in the differential signal unit are not located within the isolation disk 4, or multiple isolation holes are located within the isolation disk 4, and the area of ​​the isolation hole 5 within the isolation disk 4 is less than half of its cross-sectional area.

[0056] The printed circuit board also includes an outgoing trace layer, which is adjacent to and located between two inner layers III 15. Signal traces are provided within the outgoing trace layer, and an outgoing trace layer via 10 communicating with signal vias 2 is provided. The outgoing trace layer via 10 surrounds the corresponding signal via 2, and connects to the corresponding signal trace, such as... Figure 8 , 9As shown in the figure. In the same differential signal unit, each signal via 2 is provided with an output layer via 10, and each output layer via 10 is connected to a signal trace. The signal traces connected by the two signal vias 2 through the output layer via 10 are trace I 7 and trace II 8, respectively. The width of the signal trace 9 inside the isolation disk is greater than that of the signal trace outside the area of ​​the isolation disk 4. Taking the orientation shown in the figure as an example, and using several embodiments as examples, the explanation is provided.

[0057] Embodiment 1 of the present invention, as follows Figure 1 , 1-1 When processing signal hole 1, a through hole is first drilled with a 0.3mm drill bit as the main hole 101. Then, an additional hole 102 is drilled on the left and right sides of the main hole with a 0.25mm drill bit. This forms an irregular signal hole with "multi-circular hinge" dimensions of 0.4*0.3mm. This type of signal hole is suitable for situations where the width direction of the connector's fisheye is parallel to the wafer direction. The advantages of this embodiment are: the vertical space of the printed circuit board is 0.1mm more than that of a hole drilled with a single 0.4mm drill bit, which can accommodate 6 isolation holes 5. At the same time, the traces do not need to snake between the isolation holes 5 and can be led out to the external area of ​​the connector without bending. Compared with the vias formed by drilling with a 0.4mm drill bit in the traditional technology, the vias of this technology have smaller inner contour dimensions, higher impedance values ​​to match the connector impedance, and better signal integrity performance.

[0058] Embodiment 2 of the present invention, as follows Figure 2 , 2-1 When processing signal hole 1, first use a 0.3mm drill bit to drill a through hole as the main hole 101, and then use a 0.25mm drill bit to drill a blind hole above and below the main hole 101 as an auxiliary hole 102. This type of hole is suitable for the case where the width direction of the connector fisheye is perpendicular to the wafer direction.

[0059] Embodiment 3 of the present invention, as follows Figure 3 , 3-1 When machining signal hole 1, first use a 0.3mm drill bit to drill a through hole as the main hole 101. Then use a 0.25mm drill bit to drill a blind hole in the upper left and lower right positions of the main hole 101 as an auxiliary hole 102, or drill a blind hole in the upper right and lower left positions of the main hole 101 as an auxiliary hole 102. This type of signal hole is suitable for situations where the width direction of the connector fisheye is neither parallel nor perpendicular to the Wafer direction.

[0060] There are two signal holes 1 in a differential signal unit. In this embodiment, the additional holes 102 of the two signal holes 1 are in different positions. The additional hole 102 of one signal hole is located at the upper left and lower right, and the additional hole 102 of the other signal hole is located at the upper right and lower left. In other embodiments, the additional holes 102 on the two signal holes 1 are in the same position, either at the upper left and lower right or at the upper right and lower left.

[0061] Embodiment 4 of the present invention, as follows Figure 4 , 4-1 When machining signal hole 1, first drill a through hole with a 0.3mm drill bit as the main hole 101. Then, drill a blind hole to the left or right of the main hole 101 with a 0.3mm drill bit as the auxiliary hole 102. This type of signal hole is suitable for connectors where the fisheye width direction is parallel to the wafer direction. In a differential signal unit, there are two signal holes, and the auxiliary holes of the two signal holes are in the same orientation, either to the left or right.

[0062] Embodiment 5 of the present invention, as follows Figure 5 , 5-1 When machining signal hole 1, a through hole is first drilled using a 0.3mm drill bit as the main hole 101. Then, a blind hole is drilled to the left or right of the main hole 101 using a 0.3mm drill bit as the auxiliary hole 102. This type of signal hole is suitable for connectors where the fisheye width direction is parallel to the wafer direction. The difference between this and embodiment 4 lies in the relative positions of the auxiliary hole and the main hole in the same differential signal unit. In this embodiment, there are two signal holes in one differential signal unit, and the auxiliary holes of the two signal holes are in different positions, one of which is to the left and the other to the right.

[0063] Embodiment 6 of the present invention, as follows Figure 6 , 6-1 When processing signal hole 1, first use a 0.3mm drill bit to drill a through hole as the main hole 101, and then use a 0.3mm drill bit to drill a blind hole above or below the main hole 101 as an auxiliary hole 102. This type of signal hole is suitable for situations where the width direction of the connector fisheye is perpendicular to the wafer direction.

[0064] Embodiment 7 of the present invention, as follows Figure 7 , 7-1 When machining signal hole 1, first use a 0.3mm drill bit to drill a through hole as the main hole 101, and then use a 0.3mm drill bit to drill a blind hole as an auxiliary hole 102 in the upper left, lower right, lower left or upper right position of the main hole 101. This type of signal hole is suitable for situations where the width direction of the connector fisheye is neither parallel nor perpendicular to the Wafer direction.

[0065] In other embodiments of the present invention, after drilling the main hole with a drill bit, one or more additional holes are drilled using the same or different drill bits. The additional holes are connected to and partially overlap with the main hole. The arrangement direction of the additional holes and the main hole is the same as the width direction of the connector fisheye.

[0066] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A printed circuit board, wherein both sides of the printed circuit board are signal layers, and multiple ground layers are stacked between the two signal layers, wherein one side of the printed circuit board is designated as the front side and the other side as the back side, the front side of the printed circuit board is used for connecting connectors, and a signal hole (1) penetrating the printed circuit board is provided on the printed circuit board, characterized in that: The signal hole (1) includes a main hole (101) and at least one auxiliary hole (102). The extension direction of the main hole (101) is parallel to the extension direction of the auxiliary hole (102). The main hole (101) extends from the front to the back of the printed circuit board. The opening of the auxiliary hole (102) is located on the front of the printed circuit board. The auxiliary hole (102) is connected to the main hole (101) and partially overlaps with it. The distribution direction of the auxiliary hole (102) and the main hole (101) on the printed circuit board is the same as the fisheye width direction of the connector when plugged in. The size of the signal hole (1) in the distribution direction of the auxiliary hole (102) and the main hole (101) matches the fisheye width. The depth of the auxiliary hole (102) is greater than the length of the compliant pin working area (17) of the connector. The diameter of the auxiliary hole (102) is smaller than the diameter of the main hole (101).

2. A printed circuit board according to claim 1, characterized in that: The signal hole (1) is plated with copper to form a signal via (2).

3. A printed circuit board according to claim 1, characterized in that: The front side of the printed circuit board is provided with a surface perforated plate (3) that is connected to the signal hole (1) around the signal hole (1), and the distance between the outer edge of the surface perforated plate (3) and the outer edge of the signal hole (1) is greater than 0.1 mm.

4. A printed circuit board according to claim 1, characterized in that: At least one ground hole (6) corresponding to the signal hole (1) is provided on the printed circuit board. The ground hole (6) penetrates the printed circuit board and is electroplated to form a ground via. The ground via connects the copper of multiple ground layers to enhance signal shielding.

5. A printed circuit board according to claim 4, characterized in that: The printed circuit board is provided with isolation holes (5) corresponding to the signal hole (1). The distance between the center of the isolation hole (5) and the center of the signal hole (1) is less than the distance between the center of the ground hole (6) and the center of the signal hole (1). The isolation hole (5) connects the copper sheets of multiple ground layers to enhance signal shielding.

6. A printed circuit board according to claim 5, characterized in that: The signal hole (1) is surrounded by an isolation disk (4). The isolation disk (4) may coincide with or not coincide with at least one isolation hole (5). When the isolation disk (4) coincides with the isolation hole (5), the area of ​​each isolation hole (5) within the isolation disk (4) is less than half the cross-sectional area of ​​the isolation hole (5).

7. A printed circuit board according to claim 6, characterized in that: The printed circuit board is provided with a trace layer, which is located between two adjacent ground layers. Signal traces are provided in the trace layer, and a trace layer aperture plate (10) connected to the signal hole (1) is provided. The trace layer aperture plate (10) surrounds the corresponding signal hole (1), and the trace layer aperture plate (10) is connected to the corresponding signal trace. The width of the signal trace (9) in the isolation plate is greater than that of the signal trace outside the area of ​​the isolation plate (4).

8. A printed circuit board according to claim 1, characterized in that: The back of the printed circuit board is provided with blind holes corresponding to the signal holes. The depth of the blind holes is greater than 0.25 mm. After electroplating, the blind holes form copper holes (19).

9. A printed circuit board according to any one of claims 1-8, characterized in that: The signal hole (1) includes a main hole (101) and two auxiliary holes (102), with the two auxiliary holes (102) symmetrically arranged on both sides of the main hole (101).

10. A printed circuit board according to any one of claims 1-8, characterized in that: The signal hole (1) includes a main hole (101) and an auxiliary hole (102), with the auxiliary hole (102) located on one side of the main hole (101).

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