Printed circuit boards and test fixtures

Abstract

The present application relates to a printed circuit board and a test fixture. The printed circuit board includes a board body, a connector, a first routing line and a second routing line. The board body is provided with a first ejector pin hole and a second ejector pin hole, both of which are used to plug in ejectors; the connector is provided on the board body; the first routing line is arranged on the board body, and one end of the first routing line extends to the first ejector pin hole, and the other end of the first routing line is electrically connected to the connector; the second routing line is arranged side by side with the first routing line on the board body, and one end of the second routing line extends to the second ejector pin hole, and the other end of the second routing line is electrically connected to the connector; the first routing line and the second routing line form a differential line pair. The printed circuit board can classify key signals so that various types of signals are staggered to avoid interference with each other. For example, differential routing is implemented for signals such as differential data, that is, they are transmitted through the first routing line and the second routing line respectively, thereby improving the anti-interference ability of the printed circuit board.

Description

Technical Field

[0001] The present application relates to the technical field of electronic products, and in particular to a printed circuit board and a test fixture. Background Art

[0002] Ejector pins are important components in the fixture structure. They are used to connect with the product under test in electronic testing to measure relevant parameters such as voltage, current or signal level. The product under test is a PCBA (Printed Circuit Board Assembly, a process where a blank PCB is mounted on a board through SMT) or the electrical part of an electronic product. In traditional testing methods, since ejector pins are slender structures, each ejector pin is inserted into a Bakelite hole, and each ejector pin is connected by welding wires. There are many wires after welding, which leads to a long production cycle of the fixture. In addition, each ejector pin involves issues such as signals, voltages and currents, which are prone to interference and affect the test parameters of the product under test. Summary of the invention

[0003] Based on this, it is necessary to provide a printed circuit board and a test fixture to address the problems that the fixture production cycle is long and is prone to interference that affects the test parameters of the product being tested.

[0004] A printed circuit board, comprising:

[0005] A plate body, wherein a first ejector pin hole and a second ejector pin hole are formed on the plate body, wherein the first ejector pin hole and the second ejector pin hole are both used for inserting an ejector pin;

[0006] A connector, wherein the connector is arranged on the board;

[0007] A first wiring, wherein the first wiring is arranged on the board, one end of the first wiring extends to the first ejector hole, and the other end of the first wiring is electrically connected to the connector;

[0008] A second routing line, wherein the second routing line and the first routing line are arranged side by side on the board body, and one end of the second routing line extends to the second ejector pin hole, and the other end of the second routing line is electrically connected to the connector; the first routing line and the second routing line form a differential line pair.

[0009] In one embodiment, the inner wall of the first ejector pin hole is coated with a first metal layer, so that the inner wall of the first ejector pin hole has good wear resistance and electrical conductivity.

[0010] In one embodiment, the inner wall of the second ejector pin hole is coated with a second metal layer, so that the inner wall of the second ejector pin hole has good wear resistance and electrical conductivity.

[0011] In one embodiment, the first metal layer and the second metal layer are both copper layers, so that the first metal layer and the second metal layer have good conductivity.

[0012] In one embodiment, the board body is provided with a grounding portion, so that the printed circuit board is grounded through the grounding portion.

[0013] In one of the embodiments, a no-copper-laying area is provided on the board, the first routing line and the second routing line are both provided in the no-copper-laying area, the connector is located in the no-copper-laying area, the first ejector pin hole and the second ejector pin hole are both opened in the no-copper-laying area, and the grounding portion is located outside the no-copper-laying area to prevent the grounding portion from being laid in the no-copper-laying area during the manufacturing process, so that the grounding portion is separated from the first routing line and the second routing line, respectively.

[0014] In one embodiment, the grounding portion is a grounding area, so that the grounding portion has better grounding performance.

[0015] In one embodiment, the number of the first ejector pin holes and the number of the second ejector pin holes are both two, and each of the first ejector pin holes is arranged side by side with the corresponding second ejector pin hole; the number of the first routing lines and the number of the second routing lines are both two, and each of the first routing lines and the corresponding second routing lines together form a differential line pair, so that the printed circuit board forms two differential line pairs, so as to better transmit power and signals and reduce interference between power and signal lines.

[0016] In one embodiment, the length of each of the first routing lines is equal to the length of each of the second routing lines, so that the lengths of the first routing lines and the second routing lines of each differential line pair are equal, thereby making the differential line pair have better interference performance.

[0017] In one embodiment, the lengths of the two first routing lines are equal, and the lengths of the two second routing lines are equal.

[0018] A test fixture comprises an ejector pin and a printed circuit board as described in any one of the above embodiments, wherein the number of the ejector pins is at least two, and the first ejector pin hole and the second ejector pin hole are both plugged with an ejector pin.

[0019] The printed circuit board and the test fixture described above are provided with a first ejector hole and a second ejector hole on the board body, and one end of the first wiring extends to the first ejector hole, and the other end of the first wiring is electrically connected to the connector, so that the first ejector hole is connected to the connector through the first wiring; similarly, the second ejector hole is connected to the connector through the second wiring; when testing the voltage, current or signal level and other parameters of the PCBA or electronic products, different ejectors are respectively inserted into the first ejector hole and the second ejector hole, and the ejector holes corresponding to the ejectors can be moved up and down to adjust the height of the ejectors, so that the height of the ejectors can be freely adjusted, and there is no need to use a fixture to position and fix the ejectors, which changes the traditional method of inserting the ejectors into the bakelite holes of the tested product for testing and relying on the fixture for positioning and fixing, which has the problem of poor tightness and height adjustment convenience. At the same time, the ejector is pushed on the test point of the tested product, such as the test point of the PCBA, and the connector is connected to an external test device integrated with test software, such as a computer, so that the tested product is tested in turn. The ejector pins, corresponding wirings and connectors are electrically connected to the test equipment, so that the current, voltage and signal data of the product under test are transmitted to the test equipment to determine whether the product under test is qualified; the above-mentioned test fixture includes a printed circuit board and an ejector pin, which changes the traditional way of testing the product under test completely relying on the ejector pin welding wire connection, that is, the traditional way of testing the product under test completely relying on the ejector pin of the fixture to test the product under test is changed. Instead, the ejector pin is plugged and fixed to the printed circuit board of the test fixture, and then the ejector pin is pushed on the test point of the product under test, so as to realize the power supply and signal transmission between the fixture and the product under test. The ejector pin is electrically connected to the connector through the ejector pin hole and wiring of the board body, and then connected to the test equipment by the connector to complete the measurement of the signal, voltage and current of the product under test. The first wiring and the second wiring are arranged side by side to form a differential line pair, so that different parameters of the product under test are connected to the connector through different wirings respectively, and then transmitted to the test equipment by the connector, so as to avoid interference between the signal and the power supply and affect the test result of the product under test. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of a printed circuit board according to an embodiment;

[0021] Figure 2 for Figure 1 A schematic diagram of another viewing angle of the printed circuit board shown;

[0022] Figure 3 for Figure 1 A schematic diagram of another perspective of the printed circuit board is shown. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present application, a more comprehensive description of the printed circuit board and the test fixture will be given below with reference to the relevant drawings. The preferred embodiments of the printed circuit board and the test fixture are given in the drawings. However, the printed circuit board and the test fixture can be implemented in many different forms and are not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the printed circuit board and the test fixture more thorough and comprehensive.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of the printed circuit board and the test fixture herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0026] One embodiment is that a printed circuit board includes a board body, a connector, a first routing line and a second routing line, the board body is provided with a first ejector pin hole and a second ejector pin hole, both of which are used for inserting an ejector pin; the connector is arranged on the board body; the first routing line is arranged on the board body, and one end of the first routing line extends to the first ejector pin hole, and the other end of the first routing line is electrically connected to the connector; the second routing line is arranged side by side with the first routing line on the board body, and one end of the second routing line extends to the second ejector pin hole, and the other end of the second routing line is electrically connected to the connector; the first routing line and the second routing line form a differential line pair.

[0027] like Figure 1 As shown, a test fixture of an embodiment includes an ejector pin and a printed circuit board. The ejector pin is plugged into the printed circuit board, and the ejector pin is pushed against the test point of the product under test. Since the ejector pin is plugged and fixed on the printed circuit board, the ejector pin is electrically connected to the product under test, so that the product under test is electrically connected to an external test device integrated with test software through the ejector pin and the printed circuit board, even if the parameter data (voltage, current or signal level, etc.) of the product under test is transmitted to the test device through the ejector pin for testing. In this embodiment, the test device is a computer.

[0028] In one embodiment, the printed circuit board 10 includes a board body 100, a connector 200, a first wiring 300, and a second wiring 400. The board body is provided with a first ejector hole 110 and a second ejector hole 120, and the first ejector hole and the second ejector hole are both used for plugging ejectors, so that when the printed circuit board is tested, the ejectors are respectively inserted into the first ejector hole and the second ejector hole, so that the ejectors are fixed in the corresponding ejector holes, so that the ejectors are plugged and fixed on the board body. In this embodiment, the first ejector hole and the second ejector hole are both through-hole structures. The number of ejectors is at least two, and the first ejector hole and the second ejector hole are each plugged with an ejector. One end of each ejector is inserted into the corresponding ejector hole, and the other end is pushed against the test point of the product under test to connect with the test point of the product under test. In this way, different parameters of the product under test are respectively connected to the first ejector hole and the second ejector hole through different ejectors.

[0029] In one embodiment, the connector is arranged on the board. The first routing is arranged on the board. One end of the first routing extends to the first ejector hole, and the other end of the first routing is electrically connected to the connector, so that the first ejector hole is electrically connected to the connector through the first routing. The second routing is arranged side by side with the first routing on the board. One end of the second routing extends to the second ejector hole, and the other end of the second routing is electrically connected to the connector, so that the second ejector hole is electrically connected to the connector through the second routing. The first routing and the second routing form a differential line pair, so that the first routing and the second routing respectively transmit different parameters of the product under test. The connector is arranged on the board, and the connector is electrically connected to the first routing and the second routing respectively.

[0030] When testing the product under test, the connector is connected to the connector of the test equipment. The connector of the printed circuit board of the test fixture is set as the first connector, and the connector of the test equipment is set as the second connector. The first connector is connected to the second connector, so that the printed circuit board is electrically connected to the second connector through the first connector, thereby electrically connecting the printed circuit board to the test equipment. In this way, the signal, voltage and current data of the product under test are transmitted to the test equipment for analysis and the test results of the product under test are displayed to determine whether the product under test is qualified. This avoids the problem that the traditional fixture ejector pin connection requires welding of each ejector pin, which takes a long time and causes difficulties in later maintenance. Since the first routing and the second routing classify and transmit key signals respectively, various types of signals are staggered to avoid interference with each other. For example, differential routing is implemented for signals such as differential data, which improves anti-interference ability and solves the interference between lines.

[0031] The above-mentioned printed circuit board and test fixture have a first ejector pin hole and a second ejector pin hole on the board body, and one end of the first routing line extends to the first ejector pin hole, and the other end of the first routing line extends to the first ejector pin hole, so that the first ejector pin hole is connected to the connector through the first routing line, and similarly, the second ejector pin hole is connected to the connector through the second routing line. When testing parameters such as voltage, current or signal level of PCBA or electronic products, different ejectors are respectively inserted into the first ejector hole and the second ejector hole, and the ejector holes corresponding to the ejectors can be moved up and down to adjust the height of the ejectors, so that the height of the ejectors can be freely adjusted, and there is no need to use a fixture to position and fix the ejectors. This changes the traditional method of inserting ejectors into bakelite holes for testing and relying on fixtures for positioning and fixing, which has the problems of poor tightness and height adjustment convenience. At the same time, the ejector is pushed onto the test point of the product under test, such as inside the PCBA, and the connector is connected to an external test device integrated with test software, such as a computer, so that the product under test is electrically connected to the test device through the ejector pins, corresponding wiring and connectors in turn, so that the current, voltage and signal data of the product under test are transmitted to the test device to determine whether the product under test is qualified.

[0032] The above-mentioned test fixture includes a printed circuit board and a pin, which changes the traditional way of testing the product under test completely relying on the pin welding wire connection. Instead, the pin is plugged and fixed to the printed circuit board of the test fixture, and then the pin is pushed on the test point of the product under test, realizing the power supply and signal transmission between the fixture and the product under test. The pin is electrically connected to the connector through the pin hole and the wiring of the board body, and then connected to the test equipment by the connector to complete the measurement of the signal, voltage and current of the product under test. The first wiring and the second wiring are arranged side by side to form a differential line pair, so that different parameters of the product under test are connected to the connector through different wirings, and then transmitted to the test equipment by the connector, avoiding interference between the signal and the power supply and affecting the test results of the product under test. The printed circuit board completely avoids the connection method of the pin welding wire, and solves the problem of long production cycle of the fixture pin and easy interference to affect the test results of the product under test.

[0033] In this embodiment, the first connector is a patch connector. In other embodiments, the first connector may also be a plug-in connector. In one embodiment, the first connector includes a connector body and a pin, and the connector body is provided with a patch portion, and the patch portion is electrically connected to the pin. The patch portion is electrically connected to the first trace and the second trace respectively, so that the first trace and the second trace are both electrically connected to the connector.

[0034] See also Figure 2In one embodiment, the inner wall of the first ejector hole is coated with a first metal layer 111, so that the inner wall of the first ejector hole has good wear resistance and conductivity. In one embodiment, the first ejector hole is a cone-shaped hole structure, and the corresponding first metal layer is a frustum sleeve structure layer adapted to the first ejector hole, so that the ejector pin is inserted into the first ejector hole more firmly, and the height and tightness of the ejector pin inserted into the first ejector hole can be appropriately adjusted. In order to make the ejector pin have a certain elasticity when inserted into the first ejector hole, in one embodiment, the first metal layer is provided with a plurality of first opening grooves distributed at intervals in the circumferential direction around the center line of the first ejector hole. In this embodiment, the spacing between two adjacent first opening grooves is equal, so that the ejector pin has good elasticity when inserted into the first metal layer, so that the ejector pin is more firmly inserted into the first ejector hole.

[0035] Considering that the first ejector pin hole is small in size and it is difficult to process the first opening groove, and the strength of the first metal layer, in other embodiments, the printed circuit board also includes a first plug sleeve, which is conductive and elastic, and is located in the first ejector pin hole, so that the ejector pin is inserted into the first plug sleeve and electrically connected to the inner wall of the first metal layer, so that the ejector pin is reliably fixed in the first ejector pin hole and electrically connected to the inner wall of the first ejector pin hole. In this embodiment, the first plug sleeve is inserted into the first ejector pin hole, so that the first plug sleeve is firmly connected to the board body.

[0036] like Figure 2 As shown, in one embodiment, the inner wall of the second ejector hole is coated with a second metal layer 121, so that the inner wall of the second ejector hole has good wear resistance and conductivity. In one embodiment, the second ejector hole is a cone-shaped hole structure, and the corresponding second metal layer is a frustum sleeve structure layer adapted to the second ejector hole, so that the ejector is inserted into the second ejector hole more firmly, and the height and tightness of the ejector inserted into the second ejector hole can be adjusted appropriately. In order to make the ejector inserted into the second ejector hole have a certain elasticity, in one embodiment, the second metal layer is provided with a plurality of second opening grooves distributed at intervals in the circumferential direction around the center line of the second ejector hole. In this embodiment, the spacing between two adjacent second opening grooves is equal, so that the ejector has good elasticity when inserted into the second metal layer, so that the ejector is more firmly inserted into the second ejector hole.

[0037] Considering that the second ejector pin hole is small in size and it is difficult to process the second opening groove, and the strength of the second metal layer, in other embodiments, the printed circuit board also includes a second plug sleeve, which is conductive and elastic, and is located in the second ejector pin hole, so that the ejector pin is inserted into the second plug sleeve and electrically connected to the inner wall of the second metal layer, so that the ejector pin is reliably fixed in the second ejector pin hole and electrically connected to the inner wall of the second ejector pin hole. In this embodiment, the second plug sleeve is inserted into the second ejector pin hole, so that the second plug sleeve is firmly connected to the board body.

[0038] In order to firmly connect the ejector pin to the first ejector pin hole, in one embodiment, each ejector pin hole is welded to the corresponding ejector pin by soldering. In one embodiment, the inner wall of the first ejector pin hole and the inner wall of the second ejector pin hole are both welded to the corresponding ejector pin, so that the ejector pin is firmly connected to the printed circuit board.

[0039] In order to make the first metal layer and the second metal layer have good conductivity, in one embodiment, the first metal layer and the second metal layer are both copper layers, so that the first metal layer and the second metal layer have good conductivity. It can be understood that in other embodiments, the first metal layer and the second metal layer are not limited to copper layers, but can also be silver layers or other metal layers.

[0040] In one embodiment, the inner wall of the first ejector pin hole is coated with a first metal layer, the inner wall of the second ejector pin hole is coated with a second metal layer, the first routing line extends to the first metal layer and is welded to the first metal layer, so that the first routing line is electrically connected to the first metal layer, and because the first routing line is welded to the first metal layer, the electrical connection between the first routing line and the first metal layer is more reliable, and the electrical connection performance between the first routing line and the first metal layer is improved. The second routing line extends to the second metal layer and is welded to the second metal layer, so that the second routing line is electrically connected to the second metal layer, and because the second routing line is welded to the second metal layer, the electrical connection between the second routing line and the second metal layer is more reliable.

[0041] like Figure 1 As shown, in one embodiment, a copper-free area 100a is provided on the board to prohibit copper-free area. The first routing line and the second routing line are both arranged in the copper-free area. The connector is located in the copper-free area and connected to the board. The first ejector hole and the second ejector hole are both opened in the copper-free area. The grounding part is located outside the copper-free area to avoid laying the grounding part in the copper-free area during the manufacturing process, so that the grounding part is separated from the first routing line and the second routing line. In this embodiment, the copper-free area includes a first sub-area 101, an intermediate area 103 and a second sub-area 105. The first sub-area is connected to the second sub-area through the intermediate area. The first sub-area and the second sub-area are staggered, so that the outline of the copper-free area is bent. The first ejector hole and the second ejector hole are both located in the first sub-area, and the connector is located in the second sub-area. In this embodiment, the thickness of the board in the copper-free area is less than the thickness of the outer periphery of the copper-free area, so that the grounding part is better avoided from being laid in the copper-free area during the wiring process.

[0042] In one embodiment, the grounding portion is a grounding area, so that the grounding portion has a better grounding performance. In this embodiment, the grounding portion is arranged on the surface outside the copper-free area of ​​the board, that is, the grounding portion is a grounding surface area.

[0043] In one embodiment, the number of the first ejector pin holes and the number of the second ejector pin holes are both two. Each of the first ejector pin holes is arranged side by side with the corresponding second ejector pin hole. The number of the first routing wires and the second routing wires is both two, and each of the first routing wires and the corresponding second routing wires together form a differential line pair, so that the printed circuit board forms two differential line pairs to better transmit power and signals, reduce the interference of power and signal lines, and increase the path for the printed circuit board to transmit the parameters of the product under test. In this embodiment, the two first ejector pin holes are arranged side by side with the corresponding second ejector pin holes, respectively, to form two rows of ejector pin hole combinations, wherein one row of ejector pin hole combinations is arranged adjacent to the connector, and the other row of ejector pin hole combinations is arranged away from the connector. Each row of ejector pin hole combinations includes a first ejector pin hole and a second ejector pin hole. During testing, four ejector pins are respectively inserted into the two first ejector pin holes and the two second ejector pin holes.

[0044] In order to make the differential line pair have better interference performance, in one embodiment, the length of each of the first routing lines is equal to the length of each of the second routing lines, so that the length of the first routing line and the second routing line of each differential line pair are equal, thereby making the differential line pair have better interference performance.

[0045] In order to improve the anti-interference capability of the printed circuit board, in one embodiment, the lengths of the two first routing lines are equal, and the lengths of the two second routing lines are equal, that is, the lengths of the first routing lines corresponding to the two first ejector pinholes located in different rows of ejector pinhole combinations are equal, and the lengths of the second routing lines corresponding to the two second ejector pinholes located in different rows of ejector pinhole combinations are equal. In this embodiment, the lengths of the two first routing lines are equal, the lengths of the two first routing lines are equal, and the length of each first routing line is equal to the length of each second routing line, that is, the lengths of the two differential line pairs are equal, thereby improving the anti-interference capability of the printed circuit board.

[0046] In one of the embodiments, the two first routing lines and the two second routing lines are all located in the copper-free zone, and the length of each first routing line is equal to that of each second routing line. Each first routing line is arranged side by side with the corresponding second routing line to form a pair of differential line pairs, so that the two first routing lines and the two second routing lines together form two pairs of differential line pairs. The lengths of the two pairs of differential line pairs are equal, and the two pairs of differential line pairs are all located in the copper-free zone, so that the printed circuit board can perform differential transmission of signals or power, and at the same time better improve the anti-interference ability of the printed circuit board. In addition, since the grounding portion is located outside the copper-free zone, the grounding portion is prevented from interfering with the wiring in the copper-free zone.

[0047] like Figure 1 As shown, in one embodiment, the first routing line connected to the first ejector hole of the adjacent connector has a first serpentine bending area 310, that is, the first routing line connected to the first ejector hole of the adjacent connector has a wavy bending structure, so that the length of the first routing line connected to the first ejector hole of the adjacent connector and the first routing line connected to the first ejector hole far away from the connector are equal, while saving the layout space required for the first routing line connected to the first ejector hole of the adjacent connector and improving the anti-interference performance of the first routing line.

[0048] like Figure 1 As shown, in one embodiment, the second routing line connected to the second ejector hole of the adjacent connector has a second serpentine bending area 410, that is, the second routing line connected to the second ejector hole of the adjacent connector has a wavy bending structure, so that the length of the second routing line connected to the second ejector hole of the adjacent connector and the second routing line connected to the second ejector hole far from the connector are equal, while saving the layout space required for the second routing line connected to the second ejector hole of the adjacent connector, and improving the anti-interference performance of the second routing line. In this embodiment, the length of the first routing line connected to the first ejector hole of the adjacent connector and the second routing line connected to the second ejector hole of the adjacent connector are equal, and both have a serpentine bending area, so that the pair of differential line pairs have a curved part, and the length of the pair of differential line pairs and another pair of differential line pairs are equal, that is, the length of the differential line pair 10a running on the curve and the differential line pair 10b running on the straight line are equal, ensuring that the lengths of the two pairs of differential line pairs are the same, and improving the anti-interference ability of the printed circuit board.

[0049] In one embodiment, the two first routing lines and the two second routing lines are both located in the copper-free area, and the length of each first routing line is equal to that of each second routing line. Each first routing line is arranged side by side with the corresponding second routing line to form a pair of differential line pairs, so that the two first routing lines and the two second routing lines together form two pairs of differential line pairs. Both pairs of differential line pairs are electrically connected to the connector. The first routing line connected to the first ejector pin hole of the adjacent connector has a first serpentine bending area, and the second routing line connected to the second ejector pin hole of the adjacent connector has a second serpentine bending area. The first routing line with the first serpentine bending area and the second routing line with the second serpentine bending area form one pair of differential line pairs, so that the pair of differential line pairs have serpentine bending areas, and the length of the pair of differential line pairs is equal to the length of the other pair of differential line pairs, which greatly reduces the wiring space required in the copper-free area, saves the area of ​​the board, and makes the structure of the printed circuit board more compact. The two pairs of differential lines are equal in length and are both located in the copper-free area, so that the printed circuit board can perform differential transmission of signals or power, and at the same time better improve the anti-interference ability of the printed circuit board. In addition, since the grounding part is located outside the copper-free area, the grounding part is prevented from interfering with the wiring in the copper-free area.

[0050] like Figure 2 As shown, in one embodiment, the printed circuit board also includes a power supply line 500, which is arranged on the board body. The power supply line is used to be electrically connected to an external power supply, so that the printed circuit board is electrically connected to the external power supply, so that the board body works normally during the test process, so that the printed circuit board can reliably complete the test. Further, the power supply line is located outside the forbidden copper plating area to prevent the power supply line from interfering with the line in the forbidden copper plating area. In order to improve the convenience of testing the printed circuit board, in this embodiment, the power supply line is arranged adjacent to the forbidden copper plating area, so that the structural layout of the printed circuit board is more compact. Further, the board body is provided with a third ejector hole 140 and a fourth ejector hole 150, wherein the third ejector hole is a ground ejector hole, and the fourth ejector hole is a power ejector hole. The third ejector hole is located outside the forbidden copper plating area. One end of the power supply line is provided with a power input position 152, and the other end of the power supply line extends to the fourth ejector hole 150, so that the external power is input into the power supply line through the power supply input position 152, and then the power supply line is electrically connected to the fourth ejector hole 150. In this embodiment, the power input position is a through hole, and in other embodiments, the power input position is a pin hole. In one embodiment, the plate body is provided with a ground input 142 of the power supply, and the ground input of the power supply is arranged adjacent to the power input position. In this embodiment, the ground input of the power supply is a through hole, and in other embodiments, the ground input of the power supply is a pin hole. During the test process, the external power supply adds power to the fourth pin hole 150 and the third pin hole 140 pins through the power input position 152 and the ground input 142 of the power supply, respectively, and then the power is delivered to the product under test through the pins in the fourth pin hole 150 and the third pin hole 140. In this embodiment, the third pin hole is a ground pin hole of a 5V power supply, and the fourth pin hole is a pin hole of a 5V power supply.

[0051] In one embodiment, the two first routing lines and the two second routing lines are all located in the copper-free area, and the length of each first routing line is equal to that of each second routing line. The power routing line is arranged at the periphery of the copper-free area, so that the power routing line is separated from the routing lines in the copper-free area to avoid the power routing line from interfering with the routing lines in the copper-free area. Each first routing line is arranged side by side with the corresponding second routing line to form a pair of differential line pairs, so that the two first routing lines and the two second routing lines together form two pairs of differential line pairs. Both pairs of differential line pairs are electrically connected to the connector. The first routing line connected to the first ejector pin hole of the adjacent connector has a first serpentine bend area, and the second routing line connected to the second ejector pin hole of the adjacent connector has a second serpentine bend area. The first routing line with the first serpentine bend area and the second routing line with the second serpentine bend area form a pair of differential line pairs, so that the pair of differential line pairs have serpentine bend areas, and the length of the pair of differential line pairs is equal to the length of the other pair of differential line pairs, which greatly reduces the wiring space required in the copper-free area, saves the area of ​​the board, and makes the structure of the printed circuit board more compact. The lengths of the two pairs of differential line pairs are equal, and the two pairs of differential line pairs are both located in the copper-free area, so that the printed circuit board can perform differential transmission of signals or power, and at the same time better improve the anti-interference ability of the printed circuit board. In addition, because the grounding portion is located outside the copper-free area, the grounding portion is prevented from interfering with the wiring in the copper-free area. In this embodiment, the power line is arranged close to the boundary of the no-copper-plating area, so that the space of the board is fully utilized. At the same time, the third ejector pin hole and the fourth ejector pin hole can be arranged adjacent to the boundary of the no-copper-plating area, thereby making the structure of the printed circuit board more compact.

[0052] like Figure 2 As shown, in one embodiment, the inner wall of the third ejector hole is coated with a third metal layer 141, so that the inner wall of the third ejector hole has good wear resistance and conductivity. In one embodiment, the inner wall of the fourth ejector hole is coated with a fourth metal layer 151, so that the inner wall of the fourth ejector hole has good wear resistance and conductivity. In this embodiment, the third metal layer and the fourth metal layer are both copper layers, so that the third metal layer and the fourth metal layer have good conductivity. Specifically, the structures of the third ejector hole and the fourth ejector hole can be the same as the structure of the first ejector hole.

[0053] like Figures 1 to 3As shown, in one embodiment, the board body includes a first board layer 160 and a second board layer 170 connected to the first board layer, and the first board layer and the second board layer are stacked. The first routing line and the second routing line are both arranged on the side of the first board layer away from the second board layer. The connector is arranged on the side of the first board layer away from the second board layer. The power routing line is arranged on the side of the second board layer away from the first board layer. In this way, the first routing line, the second routing line and the connector are all located on one side of the board body, and the power routing line is located on the other side of the board body, so as to better avoid the power routing line interfering with the signal or power transmission of the routing line in the copper-free area, and at the same time make full use of the layout space of the printed circuit board. In this embodiment, the board body is a two-layer board structure. In other embodiments, the board body is not limited to a two-layer board structure, that is, an intermediate layer structure is provided between the first board layer and the second board layer.

[0054] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be noted that, for a person of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A printed circuit board, It is characterized in that include: A plate body, wherein a first ejector pin hole and a second ejector pin hole are formed on the plate body, wherein the first ejector pin hole and the second ejector pin hole are both used for inserting an ejector pin; A connector, wherein the connector is arranged on the board; A first wiring, wherein the first wiring is arranged on the board, one end of the first wiring extends to the first ejector hole, and the other end of the first wiring is electrically connected to the connector; a second routing line, wherein the second routing line and the first routing line are arranged side by side on the board body, and one end of the second routing line extends to the second ejector pin hole, and the other end of the second routing line is electrically connected to the connector; the first routing line and the second routing line form a differential line pair; the first routing line and the second routing line are equal in length; A copper-free zone is provided on the board, the first routing line and the second routing line are both provided in the copper-free zone, the connector is located in the copper-free zone, and the first ejector pin hole and the second ejector pin hole are both opened in the copper-free zone; the thickness of the board body in the copper-free zone is less than the thickness of the outer periphery of the copper-free zone, and the outline of the copper-free zone is bent.

2. The printed circuit board according to claim 1, It is characterized in that The inner wall of the first ejector pin hole is coated with a first metal layer.

3. The printed circuit board according to claim 2, It is characterized in that The inner wall of the second ejector pin hole is coated with a second metal layer.

4. The printed circuit board according to claim 3, It is characterized in that The first metal layer and the second metal layer are both copper layers.

5. The printed circuit board according to claim 1, It is characterized in that The plate body is provided with a grounding portion.

6. The printed circuit board according to claim 5, It is characterized in that The grounding portion is located outside the copper-prohibited area.

7. The printed circuit board according to claim 5 or 6, It is characterized in that The grounding portion is a grounding area.

8. The printed circuit board according to any one of claims 1 to 6, It is characterized in that The number of the first ejector pin holes and the number of the second ejector pin holes are both two, and each of the first ejector pin holes and the corresponding second ejector pin holes are arranged side by side; the number of the first routing lines and the number of the second routing lines are both two, and each of the first routing lines and the corresponding second routing lines together form a differential line pair.

9. The printed circuit board according to claim 8, It is characterized in that The length of each of the first routing lines is equal to the length of each of the second routing lines; the lengths of two of the first routing lines are equal, and the lengths of two of the second routing lines are equal.

10. A test fixture, It is characterized in that A printed circuit board comprising an ejector pin and any one of claims 1 to 9, wherein the number of the ejector pins is at least two, and the first ejector pin hole and the second ejector pin hole are each plugged with an ejector pin.

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