Board-to-board connector

Abstract

The utility model relates to the field of electric connector discloses a board to board connector, including the plastic shell that has the plug cavity inside and the conductive terminal that inserts in the plug cavity, and the plastic shell has first pair of insertion cavity and second pair of insertion cavity respectively, the conductive terminal includes the first conductive end that integrally formed in the first end of tight fit section and the second conductive end that integrally formed in the other end of tight fit section. The utility model forms first pair of insertion cavity and second pair of insertion cavity on the plastic shell respectively, and makes the conductive terminal integrally form first conductive end and second conductive end to be used for connecting the conduction of two circuit boards respectively, need not alone design and process two terminals to realize the conduction of male end and female end, not only greatly reduced the processing and design cost, and in assembly procedure is also reduced, improves the assembly efficiency to a certain extent, and due to the integral connection of first conductive end and second conductive end, avoid the problem that first conductive end and second conductive end appear between contact badly.

Description

Technical Field

[0001] This utility model relates to the field of electrical connectors, and in particular to a board-to-board connector. Background Technology

[0002] Board-to-board connectors are interface components used to establish electrical and mechanical connections directly between printed circuit boards (PCBs). Their core design principle is to achieve highly reliable, high-density interconnection. Structurally, board-to-board connectors typically consist of male and female connectors used in pairs. Key components include the insulating housing with fixed terminals and the conductive terminals that enable current and signal transmission. To meet high-speed signal requirements, and depending on the application scenario, their main types can be categorized as follows: miniature / fine-pitch type for extreme compactness; high-speed transmission type for high-speed data throughput; high-current / power supply type for high power handling; high-reliability type for harsh environments; and floating connection type to compensate for assembly errors.

[0003] The development of board-to-board connectors is evolving towards extreme miniaturization (pitch reduction to below 0.35mm), high-speed and high-frequency signal processing (supporting speeds of 56Gbps and above), and functional integration (combining power, signal, and even fiber optic components) to meet the stringent space, performance, and reliability requirements of smartphones, wearable devices, automotive electronics (especially intelligent driving and electric drive systems), data center servers, and industrial automation equipment. Essentially, they are an indispensable key component for realizing the modular design, miniaturization, and automated production of electronic devices.

[0004] Existing board-to-board connectors typically feature separate male and female connectors due to operational requirements. Each connector contains corresponding conductive terminals that connect via mating. However, the mating and conduction of these terminals rely on the elastic properties of the metal material used in the terminals themselves. After prolonged use, these terminals experience elastic fatigue, severely impacting the connection achieved through these elastic properties. This leads to poor contact and affects the stability of the board-to-board connector. Utility Model Content

[0005] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a board-to-board connector to solve the problem of unstable conduction of the conductive terminals of the male and female connectors.

[0006] To solve the above-mentioned technical problems, the present invention provides a board-to-board connector comprising a plastic housing having an internal insertion cavity and conductive terminals inserted into the insertion cavity. The plastic housing has a first pair of insertion cavities communicating with the insertion cavity and allowing a circuit board to pass through from the outside, and a second pair of insertion cavities communicating with the insertion cavity and allowing another circuit board to pass through from the outside. The conductive terminals include a mating section for tight fitting within the insertion cavity, a first contact end integrally formed on one end of the mating section and extending into the first pair of insertion cavities for contact and conduction with the circuit board, and a second contact end integrally formed on the other end of the mating section and extending into the second pair of insertion cavities for contact and conduction with the other circuit board.

[0007] Furthermore, the tight fitting section is widened and has barbs protruding on both sides along its width direction. The insertion cavity is widened and has a tight fitting cavity for inserting and pressing the barbs against it along the insertion direction. The tight fitting cavity is connected to the insertion cavity along the widening direction of the insertion cavity.

[0008] Furthermore, the first contact end is curved inward along its thickness direction to form a first arched contact segment for elastically contacting the circuit board; the second contact end is curved inward along its thickness direction to form a second arched contact segment for elastically contacting the circuit board.

[0009] Furthermore, the first arched contact segment is bent at the end away from the tight-fitting segment to form a tail segment along the insertion direction.

[0010] Furthermore, the second conductive terminal includes a bent section with the corresponding end of the self-tightening section bent inward, the second arched contact section is connected to the bent section, and the first arched contact section and the second arched contact section are located on the same side of the conductive terminal along the thickness direction relative to the tightening section.

[0011] Furthermore, the plastic housing has a first pair of insertion surfaces and a second pair of insertion surfaces that are relatively distributed along the insertion direction. The first pair of insertion cavities penetrate the first pair of insertion surfaces along the insertion direction so that a circuit board can be inserted therein along the insertion direction. The second pair of insertion cavities penetrate the second pair of insertion surfaces along the insertion direction so that another circuit board can be inserted therein along the insertion direction.

[0012] Furthermore, the insertion cavity includes a first insertion cavity segment formed within the plastic housing along the insertion direction and communicating with the first pair of insertion cavities along the width direction of the plastic housing, and a second insertion cavity segment communicating with the first insertion cavity segment along the insertion direction and communicating with the second pair of insertion cavities along the width direction of the plastic housing. The second insertion cavity segment extends through the second pair of insertion surfaces along the insertion direction to allow conductive terminals to pass through it from the outside. The tight-fitting cavity is formed on the second insertion cavity segment and located on the side away from the second pair of insertion cavities. The tight-fitting segment is inserted into the tight-fitting cavity, the first conductive contact end passes through the first insertion cavity segment and the first arched contact end extends inward into the first pair of insertion cavities, and the second conductive contact end passes through the second insertion cavity segment and the second arched contact end extends inward into the second pair of insertion cavities.

[0013] Furthermore, the insertion cavity is symmetrically divided into two groups along the width direction, and each group of insertion cavities is configured with multiple insertion cavities and distributed at equal intervals along the length direction of the plastic shell. Each of the first insertion cavity segments is also interconnected along the length direction. A first mating space for the circuit board to be squeezed in is formed between the two groups of first conductive contacts inserted into the insertion cavity, and a second mating space for the circuit board to be squeezed in is formed between the two groups of second conductive contacts inserted into the insertion cavity.

[0014] Furthermore, there is a first clearance space between the first pair of cavities, the first insertion cavity segment and the first conductive contact end for deformation of the first conductive contact end, and there is a second clearance space between the second pair of cavities, the second insertion cavity segment and the second conductive contact end for deformation of the second conductive contact end.

[0015] Furthermore, the plastic housing is provided with two oppositely distributed clamping arms for the circuit board to pass through, and each clamping arm has a third clearance space between it and the plastic housing to allow the clamping arm to deform; a protrusion for pressing against the circuit board is provided on the opposite side of the two clamping arms.

[0016] The board-to-board connector of this utility model has at least the following beneficial effects: a first pair of cavities and a second pair of cavities are formed on the plastic housing, and the conductive terminals are integrally formed into a first contact end and a second contact end for connection and conduction with two circuit boards respectively. The male and female terminals can be connected without the need for separate design and processing of the two terminals, which not only greatly reduces the processing and design costs, but also reduces the assembly process and improves the assembly efficiency to a certain extent. Furthermore, due to the integral connection of the first contact end and the second contact end, the problem of poor contact between the first contact end and the second contact end is avoided. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the circuit board structure of this utility model; Figure 2 This is a schematic diagram of the structure of the two circuit boards and the connector of this utility model; Figure 3 This is a side sectional view of the mating of the two circuit boards and the connector of this utility model; Figure 4 This is a schematic diagram of the connector structure of this utility model; Figure 5 This is a structural schematic diagram of the connector of this utility model (from another angle); Figure 6 This is a side sectional view of the connector of this utility model; Figure 7 This is a partial half-sectional schematic diagram of the connector of this utility model; Figure 8 This is an exploded view of the connector of this utility model; Figure 9 This is a schematic diagram of the structure of the plastic shell of this utility model; Figure 10 for Figure 9 An enlarged view of part A shown; Figure 11 This is a half-sectional schematic diagram of the plastic shell of this utility model; Figure 12 This is a schematic diagram of the structure of the conductive terminal of this utility model. The meanings of the labels in the attached diagram are as follows: Circuit board 1, first side 11, second side 12, plastic housing 2, first pair of insertion surfaces 211, second pair of insertion surfaces 212, insertion cavity 22, first insertion cavity segment 221, second insertion cavity segment 222, tight fitting cavity 223, first pair of insertion cavities 23, second pair of insertion cavities 24, clamping arm 25, protrusion 251, third clearance space 252, conductive terminal 3, tight fitting segment 31, barb 311, first guide contact end 32, first arched contact segment 321, tail segment 322, second guide contact end 33, bending segment 331, second arched contact segment 332, first mating space 34, second mating space 35. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Please see Figures 1 to 3The board-to-board connector of this invention is used in conjunction with a circuit board 1. The circuit board 1 has a plate-like structure with its width direction aligned with the insertion direction, and is inserted into the connector along this direction. The two sides of the circuit board 1 along the insertion direction are respectively designated as a first side 11 and a second side 12, which can be considered as a male and female end, respectively. The first side 11 is used to mate with the connector, and the second side 12 is used to mate with another connector, allowing the board-to-board connector of this invention to achieve modularity through repeated mating. Protrusions are provided on both the first side 11 and the second side 12 of the circuit board 1 at the locations where they mate with the connector, allowing the connector to abut against the protrusions or be confined between adjacent protrusions and blocked by them.

[0020] Please see Figures 2 to 12 The board-to-board connector of this utility model includes a plastic housing 2 with an internal insertion cavity 22 and conductive terminals 3 inserted into the insertion cavity 22. The conductive terminals 3 can be configured as a set to achieve mating between the circuit board 1 and the circuit board 1 by abutting against the inner wall of the plastic housing 2. In this embodiment, two sets of conductive terminals 3 are configured, with multiple terminals in each set, to improve the stability between the two sets of conductive terminals 3 and the circuit board 1 through mutual abutment. Correspondingly, the insertion cavity 22 and the conductive terminal 3 are arranged in a one-to-one correspondence.

[0021] Please see Figures 2 to 11 The plastic housing 2 is injection molded from insulating material such as plastic and has an overall rectangular structure. Therefore, the plastic housing 2 has length, width and height. The direction in which the length is located is defined as the length direction, the direction in which the width is located is defined as the width direction, and the direction in which the height is located is defined as the height direction. The circuit board 1 is inserted and mated with the plastic housing 2 along the height direction. Therefore, the height direction of the plastic housing 2 is also the insertion direction.

[0022] The two sides of the plastic housing 2, which are opposite to each other along the insertion direction, are respectively defined as the first pair of insertion surfaces 211 and the second pair of insertion surfaces 212. Corresponding to the conductive terminal 3, the insertion cavity 22 is also opened in two sets and symmetrically arranged in the plastic housing 2 along the width direction of the plastic housing 2. Each set of insertion cavities 22 is set in multiple sets and is evenly distributed along the length direction of the plastic housing 2. Each insertion cavity 22 includes a first insertion cavity segment 221 opened in the plastic housing 2 along the insertion direction and a second insertion cavity segment 222 opened from the first insertion cavity segment 221 in the plastic housing 2 along the insertion direction. The first insertion cavity segment 221 and the second insertion cavity segment 222 are interconnected in the insertion direction. In order to save materials, the first insertion cavity segments 221 of the two sets are interconnected in the length direction and form a whole cavity. The second insertion cavity segments 222 are separated by the plastic housing 2 in the length direction to ensure the basic structural support of the plastic housing 2. In order to facilitate the installation of the conductive terminal 3, the second insertion cavity section 222 extends through the second pair of insertion surfaces 212 along the insertion direction so that the conductive terminal 3 can be inserted into the insertion cavity 22 from the outside.

[0023] To better mate the conductive terminals 3 with the first side 11 and the second side 12 of the circuit board 1, the plastic housing 2 has a first pair of insertion cavities 23 that connect to the insertion cavity 22 and allow the first side 11 of the circuit board 1 to pass through from the outside, and a second pair of insertion cavities 24 that connect to the insertion cavity 22 and allow the second side 12 of another circuit board 1 to pass through from the outside. The first pair of insertion cavities 23 extends through the first pair of insertion surfaces 211 along the insertion direction, allowing the first side 11 of the circuit board 1 to pass into the first pair of insertion cavities 23 through the first pair of insertion surfaces 211. The first pair of insertion cavities 23 connects to the first insertion cavity section 221 along the width direction of the plastic housing 2, allowing the conductive terminals 3 within the first insertion cavity section 221 to contact the first side 11 of the circuit board 1 inserted into the first pair of insertion cavities 23 to achieve conductivity. The second pair of insertion cavities 24 extends through the second pair of insertion surfaces 212 along the insertion direction, allowing the second side 12 of another circuit board 1 to pass into the second pair of insertion cavities 24 through the second pair of insertion surfaces 212. The second pair of cavities 24 are connected to the second insertion cavity section 222 along the width direction of the plastic housing 2, so that the conductive terminal 3 in the second insertion cavity section 222 can contact the second side 12 of the circuit board 1 inserted into the second pair of cavities 24 to achieve conduction.

[0024] To better protect the conductive terminal 3, the width of the first pair of insertion cavities 23 is smaller than the width of the cavity formed by each of the first insertion cavity segments 221, so that the second insertion cavity segment 222 provides installation space for the conductive terminal 3. At the same time, the side of the second insertion cavity segment 222 near the first pair of insertion surfaces 211 along the insertion direction can block the conductive terminal 3 to a certain extent. In another embodiment, in order to guide the part of the conductive terminal 3 that penetrates into the first insertion cavity segment 221 so as to better cooperate with the first side 11 of the circuit board 1, the side of the first insertion cavity segment 221 near the first pair of insertion cavities 23 can be set as a slope.

[0025] To enhance the connection between the circuit board 1 and the plastic housing 2 and improve the stability between them when the circuit board 1 is inserted into the first pair of insertion cavities 23 from the first pair of insertion surfaces 211, two opposing clamping arms 25 are provided on the plastic housing 2. Preferably, the clamping arms 25 are arranged in two sets and are located at both ends of the plastic housing 2 along the longitudinal direction to avoid hindering the engagement between the circuit board 1 and the conductive terminals 3. Each set of two clamping arms 25 is spaced apart along the width direction, and a gap is provided between the two clamping arms 25 in each set for the circuit board 1 to be inserted. This gap extends through the plastic housing 2 and connects to the first pair of insertion cavities 23 along the longitudinal direction, ensuring that the circuit board 1, with sufficient length, is also inserted into the gap between the clamping arms 25 when inserted into the first pair of insertion cavities 23. To ensure the stability of the clamping arms 25 in clamping the circuit board 1, each clamping arm 25 extends in the insertion direction relative to the first pair of insertion surfaces 211 to protrude outside the first pair of insertion surfaces 211. On the opposite side of each pair of clamping arms 25, a protrusion 251 for pressing against the circuit board 1 is provided. The protrusion 251 has a slope that gradually widens towards the plastic housing 2 so that the circuit board 1 can be inserted into it and guided. The protrusion 251 is located on the end of the clamping arm 25 away from the plastic housing 2 so that it can cooperate with the conductive terminal 3 to be in different positions in the insertion direction to press against the circuit board 1, thereby preventing the circuit board 1 from tilting to a certain extent. To prevent the clamping arms 25 from forcefully pressing the circuit board 1 during insertion into the plastic housing 2, thus affecting its installation or damaging it, a third clearance space 252 is provided between each clamping arm 25 and the plastic housing 2 to allow the clamping arms 25 to deform. This third clearance space 252 is formed by a recess in the first pair of insertion surfaces 211 and extends longitudinally. When the circuit board 1 is pressed against the protrusion 251, the clamping arms 25 deform towards the third clearance space 252 to ensure that the circuit board 1 can be squeezed into the gap between each pair of clamping arms 25. It should be noted that protrusions 251 can be provided on both end faces of the plastic housing 2 along its longitudinal direction.

[0026] Please see Figures 3 to 8 and Figure 12 Each conductive terminal 3 includes a mating section 31 for tight fitting within the insertion cavity 22, a first conductive contact 32 integrally formed on one end of the mating section 31 and extending into the first pair of insertion cavities 23, and a second conductive contact 33 integrally formed on the other end of the mating section 31 and extending into the second pair of insertion cavities 24. The first conductive contact 32 is used to make contact with the first side 11 of the circuit board 1, and the second conductive contact 33 is used to make contact with the second side 12 of the other circuit board 1. The two sets of conductive terminals 3 are symmetrically or mirror-distributed.

[0027] The mating section 31 has a straight strip-shaped structure. To increase the connection stability between the mating section 31 and the insertion cavity 22, and to ensure the distribution of the first contact end 32 and the second contact end 33, the mating section 31 is widened on both sides along the width direction of the mating section 31 (or conductive terminal 3) to form protruding barbs 311. Two to three barbs 311 are provided on each side of the mating section 31. The two adjacent barbs 311 on the same side are relatively concave to provide deformation space for each barb 311. The barb portion 311 is designed to have a certain deformation capability when squeezed. The side of the barb portion 311 away from the tight fitting section 31 is slightly tilted toward the first contact end 32 or the second contact end 33 as needed. The tilting direction is set according to the installation direction of the conductive terminal 3 relative to the plastic housing 2. For example, in this embodiment, the conductive terminal 3 is inserted into the insertion cavity 22 from the second pair of insertion surfaces 212, and the end of the barb portion 311 can tilt toward the second contact end 33, and vice versa. Correspondingly, the second insertion cavity section 222 of the insertion cavity 22 is widened on both sides along its length to provide fitting cavities 223 for inserting the barb 311 along the insertion direction and pressing it against it. The fitting cavities 223 are connected to the second insertion cavity section 222 of the insertion cavity 22 along the widening direction of the insertion cavity 22, and the fitting cavities 223 extend through the second pair of insertion cavities 24 along the insertion direction, so that the barb 311 can be inserted into the insertion cavity 22 along the insertion direction with the conductive terminal 3. The fitting cavities 223 are located on the side of the second insertion cavity section 222 away from the second pair of insertion cavities 24, so as to leave installation space for the second contact terminal 33 in the second insertion cavity section 222.

[0028] After the first contact end 32 is bent from one end of the tight fitting section 31, it extends obliquely to one side along the thickness direction of the tight fitting section 31, so that the end of the first contact end 32 away from the tight fitting section 31 is obliquely away from the insertion direction relative to the insertion direction. After the conductive terminal 3 is inserted into the insertion cavity 22, the first contact end 32 extends inward along the width direction of the plastic housing 2 into the first pair of insertion cavities 23. A first arched contact segment 321 is formed on the first contact end 32, which is curved inward along the thickness direction of the conductive terminal 3 (inward means the side of the first contact end 32 away from the mating section 31 along the thickness direction of the conductive terminal 3 towards the first contact end 32, or the side of the first contact end 32 facing the first pair of plug cavities 23 after the conductive terminal 3 is installed in the plug cavity 22). The first arched contact segment 321 extends into the first pair of plug cavities 23 after the conductive terminal 3 is inserted into the plug cavity 22. The first arched contact segment 321 is used to elastically abut against the circuit board 1 after the circuit board 1 is inserted into the first pair of plug cavities 23. The first arched contact section 321 is bent at the end away from the mating section 31 and forms a tail section 322 along the insertion direction. After the conductive terminal 3 is inserted into the insertion cavity 22, the tail section 322 is located at the cavity opening of the first pair of insertion cavities 23 near the cavity opening of the first pair of insertion surfaces 211. The tail section 322 is spaced between the inner walls of the cavity openings of the first pair of insertion cavities 23 to provide deformation space for the first conductive contact 32. At the same time, the tail section 322 limits the deformation range of the first conductive contact 32 so that it will not be over-deformed and fail. Therefore, the interval between the two tail sections 322 that are relatively distributed along the width direction of the plastic shell 2 is greater than the thickness of the circuit board 1 so that the tail section 322 will not affect the use of the circuit board 1.

[0029] The second contact 33 includes a bent section 331 that bends inward at one end away from the first contact 32 and a second arched contact 332 that extends inward from the bent section 331 toward the side of the first contact 32 and then curves inward along the thickness direction of the conductive terminal 3 (or the second contact 33). The second arched contact 332 extends into the second pair of cavities 24 after the conductive terminal 3 is inserted into the insertion cavity 22. After the circuit board 1 is inserted into the first pair of cavities 23, the first arched contact 321 is used to elastically abut against the circuit board 1. The first arched contact segment 321 and the second arched contact segment 332 are located on the same side of the conductive terminal 3 along the thickness direction relative to the tight-fitting segment 31 and both face inward, so that the tight-fitting segment 31 will not hinder the use of the first guide contact 32 and the second guide contact 33 after being inserted into the tight-fitting cavity 223, while providing support for the first guide contact 32 and the second guide contact 33, so that the first guide contact 32 and the second guide contact 33 can contact the circuit board 1 to achieve conduction.

[0030] The working method of one embodiment of the board-to-board connector of this utility model is as follows: The first contact end 32 of each conductive terminal 3 is positioned directly opposite the insertion cavity 22 from the outside of the second mating surface 212, and the conductive terminal 3 is inserted into the corresponding insertion cavity 22 from the first contact end 32 side, so that the first contact end 32 passes through the first insertion cavity section 221 and the first arched contact section 321 extends inward into the first mating cavity 23; the second contact end 33 passes through the second insertion cavity section 222 and the second arched contact section 332 extends inward into the second mating cavity 24; and the barbs of the tight-fitting section 31... After part 311 is inserted into the fitting cavity 223 and the fitting section 31 is restricted, a first mating space 34 for the circuit board 1 to be squeezed in is formed between the two sets of first conductive contacts 32 inserted in each insertion cavity 22, and a second mating space 35 for the circuit board 1 to be squeezed in is formed between the two sets of second conductive contacts 33 inserted in each insertion cavity 22. Both the first mating space 34 and the second mating space 35 are hourglass-shaped and have a structure that is narrow in the middle and wide at both ends in the insertion direction. The narrowest part of the first mating space 34 and the second mating space 35 is located where no electrical circuit is installed. In its natural state, the spacing between the circuit boards 1 and the circuit board 1 is less than the thickness of the circuit board 1. The first side 11 of the circuit board 1 is inserted into the first pair of cavities 23 and the first mating space 34. The first arched contact section 321 abuts against the circuit board 1, and the tail section 322 can abut against the inner wall of the cavity opening of the first pair of cavities 23, or it can be spaced apart from the inner wall of the cavity opening, so that there is a first clearance space between the first pair of cavities 23, the first insertion cavity section 221, and the first guide contact 32 for the first guide contact 32 to deform. The second side 12 of this circuit board 1 can be connected to the second pair of cavities 23 of other identical board-to-board connectors. 4. Fitting: Insert the second side 12 of another circuit board 1 into the second pair of cavities 24 and the second mating space 35. The second arched contact section 332 abuts against the circuit board 1. There is a second clearance space between the second pair of cavities 24, the second insertion cavity section 222 and the second guide contact end 33 to allow the second guide contact end 33 to deform, so that the circuit board 1 can be inserted into the second pair of cavities 24 and the second mating space 35. The first side 11 of this circuit board 1 is used to mate with the first pair of cavities 23 of another other identical board-to-board connector to realize the conduction between the connectors and make them modular.

[0031] Compared with the prior art, the board-to-board connector of this utility model reduces the design and manufacturing cost of the conductive terminals 3 by integrating the conductive terminals 3 of the male and female ends, simplifies the installation of the conductive terminals 3, avoids poor contact between the first conductive terminal 32 and the second conductive terminal 33 during use, and improves the reliability and safety of the conductive terminals 3.

Claims

1. A board-to-board connector, characterized in that: The device includes a plastic housing with internal insertion cavities and conductive terminals inserted into the insertion cavities. The plastic housing has a first pair of insertion cavities that communicate with the insertion cavities and allow a circuit board to pass through from the outside, and a second pair of insertion cavities that communicate with the insertion cavities and allow another circuit board to pass through from the outside. The conductive terminals include a mating section for tight fitting within the insertion cavities, a first conductive terminal integrally formed on one end of the mating section and extending into the first pair of insertion cavities for contact and conduction with the circuit board, and a second conductive terminal integrally formed on the other end of the mating section and extending into the second pair of insertion cavities for contact and conduction with the other circuit board.

2. The board-to-board connector as described in claim 1, characterized in that: The tight fitting section is widened and has barbs protruding on both sides along its width direction. The insertion cavity is widened and has a tight fitting cavity for inserting the barbs along the insertion direction and pressing them against it. The tight fitting cavity is connected to the insertion cavity along the widening direction of the insertion cavity.

3. The board-to-board connector as described in claim 2, characterized in that: The first contact end is curved inward along its thickness direction to form a first arched contact segment for elastically contacting the circuit board; the second contact end is curved inward along its thickness direction to form a second arched contact segment for elastically contacting the circuit board.

4. The board-to-board connector as described in claim 3, characterized in that: The first arched contact section is bent at the end away from the tight-fitting section and forms a tail section along the insertion direction.

5. The board-to-board connector as described in claim 3, characterized in that: The second conductive terminal includes a bent section with the corresponding end of the self-tightening section bent inward, and the second arched contact section is connected to the bent section. The first arched contact section and the second arched contact section are located on the same side of the conductive terminal along the thickness direction relative to the tightening section.

6. The board-to-board connector as described in claim 3, characterized in that: The plastic housing has a first pair of insertion surfaces and a second pair of insertion surfaces that are relatively distributed along the insertion direction. The first pair of insertion cavities extends through the first pair of insertion surfaces along the insertion direction so that the circuit board can be inserted therethrough along the insertion direction. The second pair of insertion cavities extends through the second pair of insertion surfaces along the insertion direction so that another circuit board can be inserted therein along the insertion direction.

7. The board-to-board connector as described in claim 6, characterized in that: The insertion cavity includes a first insertion cavity section formed within the plastic housing along the insertion direction and communicating with a first pair of insertion cavities along the width direction of the plastic housing, and a second insertion cavity section communicating with the first insertion cavity section along the insertion direction and communicating with a second pair of insertion cavities along the width direction of the plastic housing. The second insertion cavity section extends through the second pair of insertion surfaces along the insertion direction to allow conductive terminals to pass through it from the outside. The tight-fit cavity is opened on the second insertion cavity section and located on the side away from the second pair of insertion cavities; the tight-fit section is inserted into the tight-fit cavity, the first guide contact end passes through the first insertion cavity section and the first arched contact end extends inward into the first pair of insertion cavities, the second guide contact end passes through the second insertion cavity section and the second arched contact end extends inward into the second pair of insertion cavities.

8. The board-to-board connector as described in claim 7, characterized in that: The insertion cavity is symmetrically divided into two groups along the width direction. Each group of insertion cavities is configured with multiple insertion cavities and is distributed at equal intervals along the length direction of the plastic shell. Each of the first insertion cavity segments is also interconnected along the length direction. A first mating space for the circuit board to be squeezed in is formed between the two groups of first contact terminals inserted into the insertion cavity, and a second mating space for the circuit board to be squeezed in is formed between the two groups of second contact terminals inserted into the insertion cavity.

9. The board-to-board connector as described in claim 7, characterized in that: The first pair of cavities, the first insertion cavity segment, and the first conductive contact end have a first clearance space for deformation of the first conductive contact end, and the second pair of cavities, the second insertion cavity segment, and the second conductive contact end have a second clearance space for deformation of the second conductive contact end.

10. The board-to-board connector as described in claim 1, characterized in that: The plastic housing is provided with two oppositely distributed clamping arms for inserting the circuit board therein, and there is a third clearance space between each clamping arm and the plastic housing to allow the clamping arm to deform; a protrusion for pressing against the circuit board is provided on the opposite side of the two clamping arms.

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