Female seat connector with double-layer circuit board

Abstract

The utility model discloses a female seat connector with a double-layer circuit board. The female seat connector comprises a front shell, a rear cover, the double-layer circuit board, a plurality of first signal terminals and a plurality of second signal terminals, first conductive circuits and second conductive circuits are arranged on the front side face and the rear side face of the double-layer circuit board, first plug-in mounting hole bonding pads are connected with the corresponding first conductive circuits in a conducting mode, second plug-in mounting hole bonding pads are connected with the corresponding second conductive circuits in a conducting mode, and the first plug-in mounting hole bonding pads and the second plug-in mounting hole bonding pads are transversely and alternately arranged. The first conductive circuit and the second conductive circuit are arranged in a crossed manner, and the plurality of first signal terminals are arranged in at least two rows up and down, so that the first conductive circuit and the second conductive circuit in the connector can be arranged in a crossed manner in different planes; the layout of the first conductive circuit on the front side surface of the double-layer circuit board and the layout of the second conductive circuit on the rear side surface of the double-layer circuit board do not influence each other, thereby effectively improving the utilization rate of wiring space, reducing the area of the circuit board, and facilitating the miniaturization design of the connector.

Description

Technical Field

[0001] This utility model relates to the field of connectors, and in particular to a female connector with a double-layer circuit board. Background Technology

[0002] Power connectors, also known as circuit connectors or electrical connectors, are conductive devices that bridge two conductors in a circuit, allowing current or signals to flow from one conductor to the other. A power connector is an electrical system that provides a separable interface for connecting two electronic systems. Simply put, a connector is a component used to complete the electrical connection between circuits or electronic devices; it is the bridge between the two. Examples include power plugs / sockets, IC sockets, telephone line plugs, etc.

[0003] Power connectors are widely used in various electrical circuits to connect or disconnect current or signals. This connection can be temporary and easily plugged in and out, or it can be a permanent connection between electrical equipment or wires. Power connectors are divided into male connectors and female connectors; male connectors and female connectors are mated together to establish a conductive connection in the circuit.

[0004] Current female connectors typically consist of a single-layer circuit board, a housing, multiple first terminals, and multiple second terminals. The single-layer circuit board has multiple lines, with the first and second terminals positioned at the ends of corresponding lines and connected to them. The first and second terminals are arranged horizontally side-by-side, and the single-layer circuit board, multiple first terminals, and multiple second terminals are housed within the housing. While this structure is relatively simple and enables basic connection and circuit conduction, the single-layer nature of the circuit board allows for single-sided wiring only, prohibiting cross-wiring. When the wiring is numerous and complex, this results in a large circuit board area, leading to a larger connector size. The low utilization of wiring space hinders miniaturization design. Excessive wiring density can also generate electromagnetic interference, affecting product quality and shortening product lifespan, causing inconvenience for users and failing to meet current needs. Therefore, it is necessary to research a new technical solution to improve current female connectors. Utility Model Content

[0005] In view of this, the present invention addresses the shortcomings of the existing technology, and its main purpose is to provide a female connector with a double-layer circuit board. This effectively solves the problems of existing female connectors where a single-layer circuit board only allows single-sided wiring and does not allow cross-wiring. When there are many and complex lines, the circuit board area becomes large, resulting in a large connector size. The wiring space utilization rate of the circuit board is low, which is not conducive to the miniaturization design of the connector. When the lines are too dense, electromagnetic interference is easily generated, affecting the product quality and shortening the product life.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A female connector with a double-layer circuit board includes a front shell, a rear cover, a double-layer circuit board, a plurality of first signal terminals and a plurality of second signal terminals.

[0008] The front side of the front shell is provided with a plurality of first slots, which are arranged in at least two rows, one above the other.

[0009] The rear cover is located on the rear side of the front shell and the rear cover and the front shell form a mounting cavity. The mounting cavity communicates with a plurality of first slots. The rear side of the rear cover is provided with an insertion cavity for mating with a male connector.

[0010] The double-layer circuit board is disposed in the mounting cavity. At least two first conductive lines are disposed on the front side of the double-layer circuit board, and at least two second conductive lines are disposed on the rear side of the double-layer circuit board. At least two first through-hole pads and at least two second through-hole pads are disposed on the double-layer circuit board. The first through-hole pads and the second through-hole pads are arranged alternately in the horizontal direction. The at least two first through-hole pads are respectively disposed at one end of the corresponding first conductive line and are conductively connected to the corresponding first conductive line. The at least two second through-hole pads are respectively disposed at one end of the corresponding second conductive line and are conductively connected to the corresponding second conductive line. The first conductive lines and the second conductive lines are arranged crosswise.

[0011] The plurality of first signal terminals are disposed on a double-layer circuit board and located in the mounting cavity. The first contact portions of the plurality of first signal terminals are respectively disposed in the corresponding first slots. The first solder portions of a portion of the first signal terminals are respectively connected to the corresponding first conductive lines, and the first solder portions of another portion of the first signal terminals are respectively connected to the corresponding second conductive lines. The plurality of first signal terminals are arranged in at least two rows, one above the other.

[0012] The plurality of second signal terminals are disposed on a double-layer circuit board, the second contact portion of the plurality of second signal terminals is disposed in the insertion cavity, the second solder portion of a portion of the second signal terminals is disposed in the corresponding first insertion hole pad, and the second solder portion of another portion of the second signal terminals is disposed in the corresponding second insertion hole pad.

[0013] As a preferred embodiment, the front side of the front housing is provided with two second slots, which are located beside a plurality of first slots. The two second slots are connected to the mounting cavity and are further provided with two power terminals, which are located in the mounting cavity and beside the double-layer circuit board. The third contact portion of the two power terminals is respectively located in the corresponding second slot, and the fourth contact portion of the two power terminals is located in the insertion cavity.

[0014] As a preferred embodiment, the power terminal includes a fixing part, the aforementioned third contact part, and the aforementioned fourth contact part. The third contact part and the fourth contact part are disposed at both ends of the fixing part, which is fixedly disposed in the mounting cavity. The fixing part is provided with a riveting hole, and one end of the fourth contact part is provided with a riveting part. After the riveting part passes through the riveting hole, it is riveted and flanged to form a shape and then fixed by laser spot welding. The connection structure is more stable and reliable, improving the quality of the product.

[0015] As a preferred embodiment, the front side of the back cover is provided with an annular positioning groove, and a waterproof ring is further provided. The waterproof ring is set in the annular positioning groove and cooperates with the annular positioning groove for positioning, effectively enhancing the waterproof performance of the product.

[0016] As a preferred embodiment, the front side of the rear cover is provided with a positioning groove, and the rear side of the front shell is provided with a positioning protrusion. The positioning protrusion is disposed in the positioning groove and cooperates with the positioning groove for positioning, which effectively enhances the stability of the connection structure between the front shell and the rear cover.

[0017] As a preferred embodiment, the front and rear sides of the rear cover are provided with positioning holes that communicate with positioning grooves. The positioning protrusion is provided with threaded holes and further provided with screws. The screws pass through the positioning holes and engage with the threaded holes to form a threaded connection, thereby further enhancing the stability of the connection structure between the front shell and the rear cover.

[0018] As a preferred embodiment, the positioning groove is a cylindrical structure, and correspondingly, the positioning protrusion is also a cylindrical structure.

[0019] As a preferred embodiment, there are three positioning grooves arranged in a triangular pattern. Correspondingly, there are also three positioning protrusions arranged in a triangular pattern. The three positioning grooves and three positioning protrusions are located on the periphery of the mounting cavity.

[0020] As a preferred embodiment, one part of the second signal terminals is welded and fixed to the first insertion hole pad, and the other part of the second signal terminals is welded and fixed to the second insertion hole pad, which is simple to operate and easy to assemble.

[0021] As a preferred embodiment, the second signal terminal is a round pin terminal.

[0022] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution:

[0023] By providing at least two first conductive lines on the front side of a double-layer circuit board and at least two second conductive lines on the rear side of the circuit board, at least two first through-hole pads are respectively disposed at one end of the corresponding first conductive line and connected to the corresponding first conductive line, and at least two second through-hole pads are respectively disposed at one end of the corresponding second conductive line and connected to the corresponding second conductive line. The first through-hole pads and second through-hole pads are arranged alternately in the horizontal direction, and the first conductive lines and second conductive lines are arranged intersectingly. The first soldering parts of a portion of the first signal terminals are respectively connected to the corresponding first conductive lines, and the first soldering parts of another portion of the first signal terminals are respectively connected to the corresponding second conductive lines. The plurality of first signal terminals are arranged in at least two rows vertically, and a portion of the second signal terminals are connected to the corresponding second conductive lines. The second soldering portion of the terminals is respectively set in the corresponding first insertion hole pad, and the second soldering portion of the other second signal terminals is respectively set in the corresponding second insertion hole pad. In this type of female connector, the first conductive line and the second conductive line can be arranged in a cross-planar manner, so that the layout of the first conductive line on the front side of the double-layer circuit board and the layout of the second conductive line on the rear side of the double-layer circuit board do not affect each other. This is more conducive to the wiring of the double-layer circuit board, effectively improves the utilization rate of the circuit board wiring space, is conducive to the layout of more and more complex lines, effectively reduces the area of ​​the circuit board, reduces the size of the connector, facilitates the miniaturization design of the connector, makes the circuit layout more reasonable and flexible, prevents electromagnetic interference, improves product quality, extends the service life of the product, brings convenience to users, and meets existing needs.

[0024] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of a preferred embodiment of the present utility model;

[0026] Figure 2 This is a three-dimensional structural schematic diagram of another preferred embodiment of the present utility model;

[0027] Figure 3This is an exploded view of a preferred embodiment of the present invention;

[0028] Figure 4 This is an exploded view from another angle of a preferred embodiment of the present invention;

[0029] Figure 5 This is a cross-sectional view of a preferred embodiment of the present invention;

[0030] Figure 6 This is a partial exploded view of a preferred embodiment of the present invention;

[0031] Figure 7 This is a three-dimensional structural diagram of a double-layer circuit board in a preferred embodiment of the present invention.

[0032] Figure 8 This is a three-dimensional structural diagram of the double-layer circuit board from another angle in a preferred embodiment of this utility model;

[0033] Figure 9 This is a schematic diagram of the structure of a double-layer circuit board in a preferred embodiment of the present invention, showing the first conductive line and the second conductive line intersecting.

[0034] Figure 10 This is an exploded view of the power terminal in a preferred embodiment of the present invention.

[0035] Explanation of reference numerals in the attached diagram:

[0036] 10. Front shell 11. First slot

[0037] 12. Second slot; 13. Positioning protrusion

[0038] 131, Threaded hole 20, Back cover

[0039] 21. Insertion cavity; 22. Annular positioning groove

[0040] 23. Positioning groove 24. Positioning hole

[0041] 25. Fixing groove 201. Mounting cavity

[0042] 30. Double-layer circuit board; 31. First conductive line

[0043] 32. Second conductive line; 33. First insertion hole pad

[0044] 34. Second insertion hole pad; 40. First signal terminal

[0045] 41. First contact portion; 42. First welding portion

[0046] 50. Second signal terminal; 51. Second contact portion

[0047] 52. Second welding section; 60. Power terminal

[0048] 61. Third contact part; 62. Fourth contact part

[0049] 621. Riveting part; 63. Fixing part

[0050] 631, Riveting hole 70, Waterproof ring

[0051] 80. Screws. Detailed Implementation

[0052] Please refer to Figures 1 to 10 As shown, it illustrates the specific structure of a preferred embodiment of the present invention, including a front shell 10, a rear cover 20, a double-layer circuit board 30, a plurality of first signal terminals 40, and a plurality of second signal terminals 50.

[0053] The front side of the front shell 10 is provided with a plurality of first slots 11, which are arranged in at least two rows vertically; in this embodiment, the front side of the front shell 10 is provided with two second slots 12, which are located on the side of the plurality of first slots 11; there are four first slots 11.

[0054] The rear cover 20 is disposed on the rear side of the front shell 10 and the rear cover 20 and the front shell 10 form an installation cavity 201. The installation cavity 201 communicates with a plurality of first slots 11. The rear side of the rear cover 20 is provided with an insertion cavity 21 for mating with a male connector.

[0055] In this embodiment, the two second slots 12 are connected to the mounting cavity 201, and two power terminals 60 are further provided. The two power terminals 60 are disposed in the mounting cavity 201 and located beside the double-layer circuit board 30. The third contact portion 61 of the two power terminals 60 is respectively disposed in the corresponding second slot 12, and the fourth contact portion 62 of the two power terminals 60 is disposed in the insertion cavity 21. Specifically, the power terminal 60 includes a fixing portion 63, the third contact portion 61 and the fourth contact portion 62. The third contact portion 61 and the fourth contact portion 62 are disposed at both ends of the fixing portion 63. The fixing portion 63 is fixedly disposed in the mounting cavity 201. The fixing portion 63 is provided with a riveting hole 631. One end of the fourth contact portion 62 is provided with a riveting portion 621. The riveting portion 621 passes through the riveting hole 631 and is riveted and flanged, and then fixed by laser spot welding. The connection structure is more stable and reliable, improving the quality of the product. The fourth contact portion 62 is a round pin terminal structure.

[0056] In this embodiment, the front side of the rear cover 20 is provided with an annular positioning groove 22, and a waterproof ring 70 is further provided. The waterproof ring 70 is disposed in the annular positioning groove 22 and cooperates with the annular positioning groove 22 for positioning, effectively enhancing the waterproof performance of the product. The front side of the rear cover 20 is provided with a positioning groove 23, and the rear side of the front shell 10 is provided with a positioning protrusion 13. The positioning protrusion 13 is disposed in the positioning groove 23 and cooperates with the positioning groove 23 for positioning, effectively enhancing the stability of the connection structure between the front shell 10 and the rear cover 20. The front and rear sides of the rear cover 20 are formed with a positioning hole 24, which communicates with the positioning groove 23. The positioning protrusion 13 is provided with a threaded hole 131, and a screw 80 is further provided. The screw 80 passes through the positioning hole 24 and engages with the positioning groove 23. The threaded hole 131 engages with the threaded connection, further enhancing the stability of the connection structure between the front shell 10 and the rear cover 20; the positioning groove 23 is a cylindrical structure, and correspondingly, the positioning protrusion 13 is also a cylindrical structure; there are three positioning grooves 23 arranged in a triangular pattern, and correspondingly, there are also three positioning protrusions 13 arranged in a triangular pattern, with the three positioning grooves 23 and three positioning protrusions 13 located on the periphery of the mounting cavity 201; there are three positioning holes 24, and three screws 80; the front side of the rear cover 20 is provided with a fixing groove 25, and the aforementioned annular positioning groove 22 is located on the periphery of the fixing groove 25; the double-layer circuit board 30, multiple first signal terminals 40, and two power terminals 60 are located in the fixing groove 25.

[0057] The double-layer circuit board 30 is disposed in the mounting cavity 201. At least two first conductive lines 31 are provided on the front side of the double-layer circuit board 30, and at least two second conductive lines 32 are provided on the rear side. At least two first through-hole pads 33 and at least two second through-hole pads 34 are provided on the double-layer circuit board 30. The first through-hole pads 33 and second through-hole pads 34 are arranged alternately laterally. The at least two first through-hole pads 33 are respectively disposed at one end of the corresponding first conductive line 31 and are electrically connected to the corresponding first conductive line 31. At least two second insertion hole pads 34 are respectively disposed at one end of the corresponding second conductive line 32 and are connected to the corresponding second conductive line 32. The first conductive line 31 and the second conductive line 32 are arranged crosswise. The first conductive line 31 and the second conductive line 32 can be arranged in opposite directions, so that the layout of the first conductive line 31 on the front side of the double-layer circuit board 30 and the layout of the second conductive line 32 on the rear side of the double-layer circuit board 30 do not affect each other. This is more conducive to the wiring of the double-layer circuit board 30, making it more flexible and effectively improving the wiring space utilization of the circuit board.

[0058] The plurality of first signal terminals 40 are disposed on the double-layer circuit board 30 and located in the mounting cavity 201. The first contact portion 41 of the plurality of first signal terminals 40 is disposed in the corresponding first slot 11. The first solder portion 42 of a portion of the first signal terminals 40 is connected to the corresponding first conductive line 31, and the first solder portion 42 of another portion of the first signal terminals 40 is connected to the corresponding second conductive line 32. The plurality of first signal terminals 40 are arranged in at least two rows vertically. In this embodiment, there are four first signal terminals 40, of which three first signal terminals 40 are arranged horizontally and the other first signal terminal 40 is disposed above the three first signal terminals 40.

[0059] The plurality of second signal terminals 50 are disposed on the double-layer circuit board 30, and the second contact portions 51 of the plurality of second signal terminals 50 are disposed in the insertion cavity 21. The second solder portions 52 of a portion of the second signal terminals 50 are respectively disposed in the corresponding first insertion hole pads 33, and the second solder portions 52 of another portion of the second signal terminals 50 are respectively disposed in the corresponding second insertion hole pads 34. In this embodiment, a portion of the second signal terminals 50 are soldered and fixed to the first insertion hole pads 33, and another portion of the second signal terminals 50 are soldered and fixed to the second insertion hole pads 34, which is simple to operate and easy to assemble. The second signal terminals 50 are round pin terminals. There are four second signal terminals 50.

[0060] The manufacturing and assembly process of this embodiment is described in detail below:

[0061] First, the front shell 10 is molded, and a double-layer circuit board 30, a waterproof ring 70, multiple first signal terminals 40, multiple second signal terminals 50, two power terminals 60, and three screws 80 are prepared. Next, the multiple first signal terminals 40 and multiple second signal terminals 50 are soldered onto the double-layer circuit board 30, such that some of the first signal terminals 40 are connected to the corresponding first conductive line 31, and another portion of the first signal terminals 40 are connected to the corresponding second conductive line 32. A portion of the second signal terminals 50 are soldered into the corresponding first insertion hole pads 33, and the other portion of the first signal terminals 40 are connected to the corresponding second conductive line 32. The two signal terminals 50 are soldered into the corresponding second insertion hole pads 34; then, the assembly of the first signal terminal 40, the double-layer circuit board 30, the second signal terminal 50 and the two power terminals 60 are placed into the mold and injection molded to form the back cover 20. Then, the waterproof ring 70 is installed into the annular positioning groove 22 of the back cover 20 to form a semi-finished product; finally, the semi-finished product is installed on the front shell 10, the positioning protrusion 13 of the front shell 10 is inserted into the positioning groove 23 of the back cover 20 for positioning, and the screw 80 is threaded through the positioning hole 24 and then engaged with the threaded hole 131 for threaded connection and fixation.

[0062] In use, the insertion cavity 21 of the female connector with double-layer circuit board is used for mating and conductive connection with the male connector, and the plurality of first slots 11 and two second slots 12 are used for mating and conductive connection with the plug of the power supply device. This utility model is an adapter female connector.

[0063] The key design feature of this utility model is:

[0064] By providing at least two first conductive lines on the front side of a double-layer circuit board and at least two second conductive lines on the rear side of the circuit board, at least two first through-hole pads are respectively disposed at one end of the corresponding first conductive line and connected to the corresponding first conductive line, and at least two second through-hole pads are respectively disposed at one end of the corresponding second conductive line and connected to the corresponding second conductive line. The first through-hole pads and second through-hole pads are arranged alternately in the horizontal direction, and the first conductive lines and second conductive lines are arranged intersectingly. The first soldering parts of a portion of the first signal terminals are respectively connected to the corresponding first conductive lines, and the first soldering parts of another portion of the first signal terminals are respectively connected to the corresponding second conductive lines. The plurality of first signal terminals are arranged in at least two rows vertically, and a portion of the second signal terminals are connected to the corresponding second conductive lines. The second soldering portion of the terminals is respectively set in the corresponding first insertion hole pad, and the second soldering portion of the other second signal terminals is respectively set in the corresponding second insertion hole pad. In this type of female connector, the first conductive line and the second conductive line can be arranged in a cross-planar manner, so that the layout of the first conductive line on the front side of the double-layer circuit board and the layout of the second conductive line on the rear side of the double-layer circuit board do not affect each other. This is more conducive to the wiring of the double-layer circuit board, effectively improves the utilization rate of the circuit board wiring space, is conducive to the layout of more and more complex lines, effectively reduces the area of ​​the circuit board, reduces the size of the connector, facilitates the miniaturization design of the connector, makes the circuit layout more reasonable and flexible, prevents electromagnetic interference, improves product quality, extends the service life of the product, brings convenience to users, and meets existing needs.

[0065] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A female connector with a double-layer circuit board, characterized in that: It includes a front shell, a rear cover, a double-layer circuit board, multiple first signal terminals, and multiple second signal terminals; The front side of the front shell is provided with a plurality of first slots, which are arranged in at least two rows, one above the other. The rear cover is located on the rear side of the front shell and the rear cover and the front shell form a mounting cavity. The mounting cavity communicates with a plurality of first slots. The rear side of the rear cover is provided with an insertion cavity for mating with a male connector. The double-layer circuit board is disposed in the mounting cavity. At least two first conductive lines are disposed on the front side of the double-layer circuit board, and at least two second conductive lines are disposed on the rear side of the double-layer circuit board. At least two first through-hole pads and at least two second through-hole pads are disposed on the double-layer circuit board. The first through-hole pads and the second through-hole pads are arranged alternately in the horizontal direction. The at least two first through-hole pads are respectively disposed at one end of the corresponding first conductive line and are conductively connected to the corresponding first conductive line. The at least two second through-hole pads are respectively disposed at one end of the corresponding second conductive line and are conductively connected to the corresponding second conductive line. The first conductive lines and the second conductive lines are arranged crosswise. The plurality of first signal terminals are disposed on a double-layer circuit board and located in the mounting cavity. The first contact portions of the plurality of first signal terminals are respectively disposed in the corresponding first slots. The first solder portions of a portion of the first signal terminals are respectively connected to the corresponding first conductive lines, and the first solder portions of another portion of the first signal terminals are respectively connected to the corresponding second conductive lines. The plurality of first signal terminals are arranged in at least two rows, one above the other. The plurality of second signal terminals are disposed on a double-layer circuit board, the second contact portion of the plurality of second signal terminals is disposed in the insertion cavity, the second solder portion of a portion of the second signal terminals is disposed in the corresponding first insertion hole pad, and the second solder portion of another portion of the second signal terminals is disposed in the corresponding second insertion hole pad.

2. The female connector with a double-layer circuit board according to claim 1, characterized in that: The front side of the front housing is provided with two second slots, which are located beside multiple first slots. The two second slots are connected to the mounting cavity and are further provided with two power terminals, which are located in the mounting cavity and beside the double-layer circuit board. The third contact portion of the two power terminals is respectively located in the corresponding second slot, and the fourth contact portion of the two power terminals is located in the insertion cavity.

3. The female connector with a double-layer circuit board according to claim 2, characterized in that: The power terminal includes a fixing part, the third contact part and the fourth contact part. The third contact part and the fourth contact part are disposed at both ends of the fixing part. The fixing part is fixedly disposed in the mounting cavity. The fixing part is provided with a riveting hole. One end of the fourth contact part is provided with a riveting part. The riveting part passes through the riveting hole, is riveted and flanged, and is fixed by laser spot welding.

4. The female connector with a double-layer circuit board according to claim 1, characterized in that: The front side of the rear cover is provided with an annular positioning groove, and a waterproof ring is further provided therein. The waterproof ring is set in the annular positioning groove and is positioned in conjunction with the annular positioning groove.

5. The female connector with a double-layer circuit board according to claim 1, characterized in that: The front side of the rear cover is provided with a positioning groove, and the rear side of the front shell is provided with a positioning protrusion. The positioning protrusion is disposed in the positioning groove and cooperates with the positioning groove for positioning.

6. The female connector with a double-layer circuit board according to claim 5, characterized in that: The front and rear sides of the rear cover are formed with positioning holes, which are connected to positioning grooves. The positioning protrusion is provided with a threaded hole and a screw is further provided. The screw passes through the positioning hole and engages with the threaded hole for threaded connection.

7. The female connector with a double-layer circuit board according to claim 5, characterized in that: The positioning groove is cylindrical, and correspondingly, the positioning protrusion is also cylindrical.

8. The female connector with a double-layer circuit board according to claim 5, characterized in that: There are three positioning grooves arranged in a triangle. Correspondingly, there are also three positioning protrusions arranged in a triangle. The three positioning grooves and three positioning protrusions are located on the periphery of the mounting cavity.

9. The female connector with a double-layer circuit board according to claim 1, characterized in that: One portion of the second signal terminals is soldered and fixed to the first insertion hole pad, and the other portion of the second signal terminals is soldered and fixed to the second insertion hole pad.

10. The female connector with a double-layer circuit board according to claim 1, characterized in that: The second signal terminal is a round pin terminal.

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