Earphone connector

Abstract

The earphone connector comprises a plastic base and a plurality of metal terminals, the plastic base comprises an upper surface, a lower surface and a front end face, the plastic base is provided with an insertion hole, a first mounting groove and a second mounting groove, the first mounting groove and the second mounting groove are located on the same side of the insertion hole, and the distance between the first mounting groove and the insertion hole is smaller than that between the second mounting groove and the insertion hole; the projections of the first mounting groove and the second mounting groove on the longitudinal section of the plastic base are partially overlapped; each metal terminal comprises a fixing part and a welding part, the plurality of metal terminals comprise two metal terminals which are positioned on the same side of the jack and are longitudinally adjacent along the plastic base, the fixing part of one metal terminal is connected in the first mounting groove in a penetrating manner, and the fixing part of the other metal terminal is connected in the second mounting groove in a penetrating manner so as to be fixedly matched with the plastic base. According to the utility model, the plastic base has a relatively small length size, which is beneficial to the miniaturization design of the earphone connector.

Description

Technical Field

[0001] This utility model relates to the field of connector technology, specifically to an earphone connector. Background Technology

[0002] Headphone connectors are commonly used in 3C products such as mobile phones, tablets, and laptops to transmit audio signals. A typical headphone connector includes a plastic base and multiple metal terminals. These metal terminals include signal terminals for signal transmission and switch terminals for detecting whether the headphone plug is properly inserted. The metal terminals are connected to the plastic base, which insulates them from each other. Each metal terminal includes a fixing part that inserts into the insulating base. During assembly, the fixing part of the metal terminal is inserted into a mounting groove on the surface of the plastic base, ensuring that the fixing part remains relatively fixed between the mounting groove and the plastic base. Because the mounting slots on the plastic base for inserting the fixing parts of the metal terminals are arranged sequentially, after multiple fixing parts of the metal terminals are inserted into multiple mounting slots, the projections of the fixing parts of adjacent metal terminals on the longitudinal section of the plastic base do not coincide. This results in a relatively large length dimension of the plastic base. Some headphone connectors achieve miniaturization of the plastic base by reducing the length dimension of the mounting slots and the size of the metal terminal fixing parts. However, the smaller fixing parts have a smaller contact area with the plastic base, resulting in lower strength of the fixing parts themselves and lower connection strength between the fixing parts and the plastic base, which seriously affects the stability of the headphone connector. Utility Model Content

[0003] The main purpose of this invention is to provide an earphone connector that, while ensuring good stability, allows the plastic base to have a relatively small length, which is beneficial for the miniaturization design of the earphone connector.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The headphone connector includes a plastic base and several metal terminals;

[0006] The plastic base includes an upper surface, a lower surface opposite to the upper surface, and a front surface located at its front end. The plastic base is provided with a socket for inserting an earphone plug, a first mounting groove, and a second mounting groove. The socket extends rearward from the front surface. The first mounting groove and the second mounting groove are located on the same side of the socket. The upper end of the first mounting groove extends to the upper surface, and the lower end of the second mounting groove extends to the lower surface. The distance between the first mounting groove and the socket is less than the distance between the second mounting groove and the socket. The projections of the first mounting groove and the second mounting groove on the longitudinal section of the plastic base overlap by at least a portion.

[0007] The metal terminal includes a fixing part and a welding part connected to the fixing part. The plurality of metal terminals include two metal terminals located on the same side of the socket and adjacent to each other along the longitudinal direction of the plastic base. Among the two adjacent metal terminals, the fixing part of one metal terminal passes through the first mounting groove from top to bottom to fix and cooperate with the plastic base, and the fixing part of the other metal terminal passes through the second mounting groove from bottom to top to fix and cooperate with the plastic base. The welding parts of both metal terminals are located outside the plastic base.

[0008] Preferably, the two adjacent metal terminals are a first switch terminal and a second switch terminal. The fixing part of the first switch terminal is inserted into the first mounting groove. The first switch terminal also includes a first spring and an insulating block. One end of the first spring is connected to the fixing part of the first switch terminal, and the other end gradually tilts towards the socket. The insulating block wraps around the other end of the first spring and is placed at the rear end of the socket. The fixing part of the second switch terminal is inserted into the second mounting groove. The second switch terminal also includes a second spring and a mating part. One end of the second spring is connected to the fixing part of the second switch terminal. The mating part is located at the other end of the second spring and outside the first spring. The insulating block is used to be squeezed by the headphone plug when the headphone plug is inserted into the rear end of the socket to drive the first spring to deform outward, so that the deformed first spring contacts the mating part and conducts electricity.

[0009] Preferably, the portion of the plastic base located between the first mounting groove and the second mounting groove forms an insulating barrier, and the insulating barrier is provided with a clearance notch. The second spring piece passes through the clearance notch from the second mounting groove so that the mating part is located in the first mounting groove.

[0010] Preferably, the welding portion of the first switch terminal includes a first horizontal connecting section bent outward from the top edge of the fixing portion of the first switch terminal to a horizontal state, and a first vertical section bent downward from the outer end of the first horizontal connecting section to a vertical state, with the lower part of the first vertical section extending to the outside of the plastic base.

[0011] Preferably, the plastic base is provided with a first through groove extending downward from its upper surface and a first recessed groove located on its upper surface. The outer side of the first recessed groove is connected to the first through groove, and the inner side is connected to the first mounting groove. The first horizontal connecting section is placed in the first recessed groove, and the lower part of the first vertical section protrudes from the outside of the plastic base after passing through the first through groove.

[0012] Preferably, the welding portion of the second switch terminal includes a second horizontal connecting section bent outward from the middle of the second switch terminal fixing portion in a horizontal state, and a second vertical section bent downward from the outer end of the second horizontal connecting section in a vertical state. A receiving groove with the opening facing downward is provided on the plastic base. The second horizontal connecting section abuts against the top surface of the receiving groove, and the lower part of the second vertical section protrudes out of the plastic base after passing through the opening of the receiving groove.

[0013] Preferably, the lower part of the first vertical segment and the lower part of the second vertical segment are both sheet-like and on the same plane.

[0014] Preferably, all metal terminals other than the first and second switch terminals are signal terminals. The multiple signal terminals include one first signal terminal and multiple second signal terminals. The plastic base is provided with a first insertion groove extending upward from its lower surface. The first insertion groove is located on the same side of the socket as the first mounting groove and the second mounting groove. The first signal terminal is inserted into the first insertion groove from bottom to top. The plastic base is provided with multiple second insertion grooves extending downward from its upper surface. The multiple second insertion grooves are located on the side of the socket opposite to the first mounting groove and the second mounting groove and are arranged in the front-back direction. The multiple second signal terminals are inserted into the multiple second mounting grooves one by one from top to bottom.

[0015] Preferably, the first signal terminal includes a vertically extending first connecting portion, a support portion extending outward from the top of the first connecting portion, a first solder foot extending downward from the outer side of the support portion, a first elastic arm, and a first contact portion. A locking groove is provided on the inner wall surface of the first mounting groove, and a hook is provided on the first connecting portion. The first connecting portion and the first solder foot respectively abut against the inner wall surface and the outer wall surface of the first mounting groove. The hook is held in the locking groove. The lower part of the first solder foot protrudes outward from the plastic base. One end of the first elastic arm is connected to the first connecting portion, and the first contact portion is located at the other end of the first elastic arm.

[0016] Preferably, the second signal terminal includes a vertically extending second connecting portion, a second solder foot, a second elastic arm, and a second contact portion. One end of the second elastic arm is connected to the second connecting portion, and the second contact portion is located at the other end of the second elastic arm. The second solder foot includes a first segment extending horizontally outward from the second connecting portion and a second segment extending downward from the outer end of the first segment. The plastic base is provided with a second through groove extending downward from its upper surface and a second recessed groove located on its upper surface. The outer side of the second recessed groove is connected to the second through groove, and the inner side is connected to the second insertion groove. The first segment of the second solder foot is placed in the second recessed groove, and the second segment extends downward through the second through groove and protrudes outward from the outside of the plastic base.

[0017] In this invention, two adjacent metal terminals along the longitudinal direction of the plastic base are placed in the first mounting groove and the second mounting groove, which are respectively located on the upper and lower surfaces of the plastic base. The two adjacent metal terminals are staggered in the width direction of the plastic base and partially overlap in the longitudinal direction of the plastic base. The length occupied by the two adjacent metal terminals on the plastic base is relatively small, resulting in a relatively small length of the plastic base, which is beneficial for the miniaturization design of the headphone connector. In addition, since the two adjacent metal terminals are mounted to the plastic base from the upper and lower surfaces respectively, interference between the soldering parts on the two metal terminals used to mate with the circuit board can be avoided, facilitating the assembly of the headphone connector. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 for Figure 1 A schematic diagram of the assembly of the first switch terminal, the first signal terminal, and the plastic base;

[0021] Figure 3 for Figure 1 Schematic diagram of the structure of the plastic base;

[0022] Figure 4 for Figure 1 A schematic diagram of the structure of the first and second switch terminals.

[0023] Wherein: 10, plastic base; 101, upper surface; 102, lower surface; 103, front end face; 104, insertion hole; 11, first mounting groove; 111, first recessed groove; 112, first through groove; 113, insulating barrier; 114, clearance notch; 12, second mounting groove; 121, receiving groove; 13, first insertion groove; 131, locking groove; 14, second insertion groove; 141, second recessed groove; 142, second through groove; 20, first switch terminal; 21, fixing part; 22, welding part; 221, first horizontal connecting section; 222, first vertical section; 2 3. First spring; 24. Insulating block; 30. Second switch terminal; 31. Fixing part; 32. Welding part; 321. Second horizontal connecting section; 322. Second vertical section; 33. Second spring; 34. Mating part; 40. First signal terminal; 41. First connecting part; 411. Hook; 42. Support part; 43. First welding foot; 44. First elastic arm; 45. First contact part; 50. Second signal terminal; 51. Second connecting part; 52. Second welding foot; 521. First section; 522. Second section; 53. Second elastic arm; 54. Second contact part.

[0024] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0027] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0028] like Figure 1 , 2 As shown in Figures 3 and 4, this utility model discloses an earphone connector, which includes a plastic base 10 and several metal terminals. The plastic base 10 includes an upper surface 101, a lower surface 102 opposite to the upper surface 101, and a front surface 103 located at the front end of the plastic base 10. The plastic base 10 is provided with a socket 104 extending rearward from the front surface 103. The socket 104 is used for inserting an earphone plug to realize the transmission of audio signals. The plastic base 10 is provided with a first mounting groove 11 and a second mounting groove 12. The upper end of the first mounting groove 11 extends to the upper surface 101, and the lower end of the first mounting groove 11 can be set as a blind end. The lower end of the second mounting groove 12 extends to the lower surface 102. The lower end of the second mounting groove 12 can be configured as a blind end. The first mounting groove 11 and the second mounting groove 12 are located on the same side of the insertion hole 104, with the first mounting groove 11 located on the inner side and the second mounting groove 12 located on the outer side. That is, the distance between the first mounting groove 11 and the insertion hole 104 is less than the distance between the second mounting groove 12 and the insertion hole 104. Furthermore, at least a portion of the projections of the first mounting groove 11 and the second mounting groove 12 onto the longitudinal section of the plastic base 10 (i.e., a plane parallel to the front-back direction and perpendicular to the upper surface 101) coincides. Two of the plurality of metal terminals are a first switch terminal 20 and a second switch terminal 30. Among these metal terminals, the first switch terminal 20 and the second switch terminal 30 are two adjacent metal terminals along the longitudinal direction of the plastic base 10. The first switch terminal 20 includes a fixing portion 21 and a soldering portion 22 connected to the fixing portion 21. The second switch terminal 30 includes a fixing portion 31 and a soldering portion 32 connected to the fixing portion 31. The fixing portion 21 of the first switch terminal 20 passes through the first mounting groove 11 from top to bottom, so that the fixing portion 21 is fixedly engaged with the plastic base 10. When the fixing portion 21 of the first switch terminal 20 is placed in the first mounting groove 11... After the groove 11, the welding part 22 is placed outside the plastic base 10 to facilitate the connection of the first switch terminal 20 to the corresponding terminal on the circuit board; the fixing part 31 of the second switch terminal 30 passes through the second mounting groove 12 from bottom to top, so that the fixing part 31 is fixedly engaged with the plastic base 10. After the fixing part 31 of the second switch terminal 30 is placed in the second mounting groove 12, the welding part 32 is placed outside the plastic base 10 to facilitate the connection of the second switch terminal 30 to the corresponding terminal on the circuit board. The first switch terminal 20 and the second switch terminal 30 cooperate with each other to detect whether the headphone plug is inserted into the jack 104.

[0029] In a preferred embodiment, the first switch terminal 20 further includes a first spring 23 and an insulating block 24. One end of the first spring 23 is connected to the fixing part 21, and the other end gradually slopes towards the rear end of the socket 104. The insulating block 24 wraps around the other end of the first spring 23 and is placed at the rear end of the socket 104. The second switch terminal 30 further includes a second spring 33 and a mating part 34. One end of the second spring 33 is connected to the fixing part 31, and the mating part 34 is disposed at the other end of the second spring 33 and located outside the first spring 23. When the headphone plug is fully inserted into the socket 104, the head end of the headphone plug presses the insulating block 24 outward. As the insulating block 24 moves outward, it drives the first spring 23 to move outward. The first spring 23 changes shape, and after this change, it contacts the mating part 34 and becomes electrically conductive. That is, when the headphone plug is not fully inserted into the jack 104, and the headphone plug does not press against the insulating block 24 or the insulating block 24 does not move sufficiently, the first spring 23 will not contact the mating part 34 on the second spring 33. The first switch terminal 20 and the second switch terminal 30 are in an open state, and it is determined that the headphone plug is not inserted. Conversely, when the headphone plug is fully inserted into the jack 104, the first spring 23 contacts the mating part 34, and the first switch terminal 20 and the second switch terminal 30 are short-circuited, and it is determined that the headphone plug is fully inserted. Of course, in other embodiments, the detection of whether the headphone plug is inserted using the first switch terminal 20 and the second switch terminal 30 is not limited to the method described above.

[0030] An insulating barrier 113 is formed on the plastic base 10 between the first mounting groove 11 and the second mounting groove 12. An avoidance notch 114 is provided on the insulating barrier 113. The second spring 33 passes through the avoidance notch 114 from the second mounting groove 12, so that the mating part 34 on the second spring 33 can extend into the first mounting groove 11. The insulating barrier 113 insulates and isolates the fixing part 21 from the fixing part 31. At the same time, the avoidance notch 114 on the insulating barrier 113 can ensure that the first switch terminal 20 and the second switch terminal 30 cooperate with each other to realize the insertion detection of the headphone plug.

[0031] The welding portion 22 of the first switch terminal 20 includes a first horizontal connecting section 221 and a first vertical section 222. The first horizontal connecting section 221 is bent outward from the top edge of the fixing portion 21 to a horizontal state, and the first vertical section 222 is bent downward from the outer end of the first horizontal connecting section 221 to a vertical state. The lower part of the first vertical section 222 extends to the outside of the plastic base 10. A first through groove 112 extending downward from its upper surface 101 and a first recessed groove 111 located on the upper surface 101 are provided on the plastic base 10. The outer side of the first recessed groove 111 is connected to the first through groove 112 and the inner side is connected to the first mounting groove 11. When the first switch terminal 20 is inserted into the first mounting groove 11 from top to bottom, the first vertical section 222 is inserted into the first through groove 112 from top to bottom. When the fixing part 21 and the first spring piece 23 are completely placed in the first mounting groove 11, the first horizontal connecting section 221 is embedded in the first recessed groove 111. After the first vertical section 222 passes through the first through groove 112, the lower part of the first vertical section 222 protrudes out of the plastic base 10. In this way, the lower part of the first vertical section 222 can be welded to the corresponding terminal of the circuit board located below the plastic base 10 to facilitate the assembly of the headphone connector and the circuit board. The welding portion 32 of the second switch terminal 30 includes a second horizontal connecting section 321 and a second vertical section 322. The second horizontal connecting section 321 is bent outward from the middle of the fixed part 31 in the height direction to a horizontal state, and the second vertical section 322 is bent downward from the outer end of the second horizontal connecting section 321 to a vertical state. A receiving groove 121 with an opening facing downward is provided on the plastic base 10. When the second switch terminal 30 is inserted into the second mounting groove 12 from bottom to top, the welding portion 32 is bent downward from bottom to top. The second horizontal connecting section 321 abuts against the top surface of the receiving groove 121 when the fixing part 31 of the second switch terminal 30 and the second spring piece 33 are fully placed in the second mounting groove 121. The lower part of the second vertical section 322 protrudes from the opening of the receiving groove 121 and extends beyond the plastic base 10. The lower part of the second vertical section 322 can be soldered to the corresponding terminal of the circuit board located below the plastic base 10 to facilitate the assembly of the headphone connector and the circuit board. To further facilitate the assembly of the headphone connector and the circuit board, the lower parts of both the first vertical section 222 and the second vertical section 322 are sheet-like and on the same plane. Specifically, both the first switch terminal 20 and the second switch terminal 30 are made of metal sheet, making both the first vertical section 222 and the second vertical section 322 sheet-like structures.

[0032] The metal terminals of this utility model also include multiple signal terminals. That is, all metal terminals other than the first switch terminal 20 and the second switch terminal 30 are signal terminals. The multiple signal terminals specifically include one first signal terminal 40 and three second signal terminals 50. The first signal terminal 40, the first switch terminal 20, and the second switch terminal 30 are all located on one side of the socket 104, and the three second signal terminals 50 are located on the other side of the socket 104. Specifically, the plastic base 10 is provided with a first insertion groove 13 extending upward from its lower surface 102. The first insertion groove 13, the first mounting groove 11, and the second mounting groove 12 are located on the same side of the socket 104. The first signal terminal 40 is inserted into the first insertion groove 13 from bottom to top. The plastic base 10 is provided with three second insertion grooves 14 extending downward from its upper surface 101. The three second insertion grooves 14 are arranged along the longitudinal direction of the plastic base 10 (i.e., the front-to-back direction in the figure). The three second signal terminals 50 are inserted into the three second insertion grooves 14 one by one from top to bottom. By arranging several metal terminals on both sides of the jack 104, the overall length of the plastic base 10 can be made relatively small. The first signal terminal 40 and three second signal terminals 50 are used to contact multiple contact areas on the headphone plug after the headphone plug is inserted into the jack 104, thereby realizing the transmission of four pairs of audio signals.

[0033] The aforementioned first signal terminal 40 includes a vertically extending first connecting portion 41, a support portion 42 extending outward from the top of the first connecting portion 41, a first solder foot 43 extending downward from the outer side of the support portion 42, a first elastic arm 44, and a first contact portion 45. A locking groove 131 is provided on the inner wall of the first insertion slot 13, and a hook 411 is provided on the first connecting portion 41. The first connecting portion 41 and the first solder foot 43 respectively abut against the inner and outer wall surfaces of the first insertion slot 13, and the hook 411 is engaged in the locking groove 131. The lower part of the first solder foot 43 protrudes outside the plastic base 10. One end of the first elastic arm 44 is connected to the first connecting portion 41, and the first contact portion 45 is located at the other end of the first elastic arm 44. After the headphone plug is inserted into the jack 104, the first contact portion 45 contacts the corresponding contact area on the headphone plug, and the elastic deformation of the first elastic arm 44 provides an elastic clamping force for the contact between the first contact portion 45 and the contact area. The first connecting part 41 and the first solder foot 43 form elastic structures at both ends of the support part 42, so that the first connecting part 41 and the first solder foot 43 can be pressed against the inner wall surface and the outer wall surface of the first insertion groove 13, respectively. That is, the first signal terminal 40 can be tightly fitted with the inner surface of the first insertion groove 13, so that the first signal terminal 40 can be stably connected to the plastic base 10. And through the engagement of the hook 411 with the locking groove 131, the first signal terminal 40 is prevented from falling off the plastic base 10. The downwardly extending first solder foot 43 can be easily soldered to the corresponding terminal on the circuit board located below the plastic base 10.

[0034] The second signal terminal 50 includes a vertically extending second connecting portion 51, a second solder foot 52, a second elastic arm 53, and a second contact portion 54. One end of the second elastic arm 53 is connected to the second connecting portion 51, and the second contact portion 54 is located at the other end of the second elastic arm 53. The second solder foot 52 includes a first segment 521 extending horizontally outward from the second connecting portion 51 and a second segment 522 extending downward from the outer end of the first segment 521. The plastic base 10 is provided with a second through groove 142 extending downward from its upper surface 101 and a second recessed groove 141 located on its upper surface 101. The outer side of the second recessed groove 141 is connected to the second through groove 142, and the inner side is connected to the second insertion groove 14. The first segment 521 of the second solder foot 52 is placed in the second recessed groove 141, and the second segment 522 extends downward through the second through groove 142 and protrudes out of the plastic base 10. The second signal terminal 50 is inserted into the second insertion slot 14 from top to bottom, so that the second segment 522 is inserted into the second through slot 142 from top to bottom. The lower part of the second segment 522 protrudes from the second through slot 142 and then protrudes from the outside of the plastic base 10.

[0035] In the above embodiments, the first mounting groove 11 and the second mounting groove 12 are staggered in the width direction of the plastic base 10 and overlap each other in the length direction of the plastic base 10. This allows the first switch terminal 20 and the second switch terminal 30 among the plurality of metal terminals to have overlapping portions in the longitudinal direction of the plastic base 10, avoiding interference between the first switch terminal 20 and the second switch terminal 30 and making the plastic base 10 have a relatively small size. In other embodiments, two metal terminals having overlapping portions in the longitudinal direction of the plastic base 10 can also be two adjacent signal terminals in the longitudinal direction of the plastic base 10. For example, one signal terminal can be installed in the first mounting groove 11 and the other signal terminal can be installed in the second mounting groove 12.

[0036] In this invention, two adjacent metal terminals along the longitudinal direction of the plastic base 10 are disposed in the first mounting groove 11 and the second mounting groove 12, and the first mounting groove 11 and the second mounting groove 12 are respectively disposed on the upper surface 101 and the lower surface 102 of the plastic base 10. The two adjacent metal terminals are staggered in the width direction of the plastic base 10 and partially overlap in the longitudinal direction of the plastic base 10. The length dimension occupied by the two adjacent metal terminals on the plastic base 10 is relatively small, and the plastic base 10 has a relatively small length dimension, which is beneficial to the miniaturization design of the headphone connector. In addition, since the two adjacent metal terminals are respectively mounted on the plastic base 10 from the upper surface 101 and the lower surface 102 of the plastic base 10, interference between the soldering parts on the two metal terminals used to mate with the circuit board can be avoided, which facilitates the assembly of the headphone connector.

[0037] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An earphone connector, characterized in that, Includes a plastic base and several metal terminals; The plastic base includes an upper surface, a lower surface opposite to the upper surface, and a front surface located at its front end. The plastic base is provided with a socket for inserting an earphone plug, a first mounting groove, and a second mounting groove. The socket extends rearward from the front surface. The first mounting groove and the second mounting groove are located on the same side of the socket. The upper end of the first mounting groove extends to the upper surface, and the lower end of the second mounting groove extends to the lower surface. The distance between the first mounting groove and the socket is less than the distance between the second mounting groove and the socket. The projections of the first mounting groove and the second mounting groove on the longitudinal section of the plastic base overlap by at least a portion. The metal terminal includes a fixing part and a welding part connected to the fixing part. The plurality of metal terminals include two metal terminals located on the same side of the socket and adjacent to each other along the longitudinal direction of the plastic base. Among the two adjacent metal terminals, the fixing part of one metal terminal passes through the first mounting groove from top to bottom to fix and cooperate with the plastic base, and the fixing part of the other metal terminal passes through the second mounting groove from bottom to top to fix and cooperate with the plastic base. The welding parts of both metal terminals are located outside the plastic base.

2. The headphone connector as described in claim 1, characterized in that, Two adjacent metal terminals are a first switch terminal and a second switch terminal. The fixing part of the first switch terminal is inserted into the first mounting groove. The first switch terminal also includes a first spring and an insulating block. One end of the first spring is connected to the fixing part of the first switch terminal, and the other end gradually tilts towards the socket. The insulating block wraps around the other end of the first spring and is placed at the rear end of the socket. The fixing part of the second switch terminal is inserted into the second mounting groove. The second switch terminal also includes a second spring and a mating part. One end of the second spring is connected to the fixing part of the second switch terminal. The mating part is located at the other end of the second spring and is located outside the first spring. The insulating block is used to be squeezed by the headphone plug when the headphone plug is inserted into the rear end of the socket to drive the first spring to deform outward, so that the deformed first spring contacts the mating part and conducts electricity.

3. The headphone connector as described in claim 2, characterized in that, An insulating barrier is formed on the portion of the plastic base located between the first mounting groove and the second mounting groove. An clearance notch is provided on the insulating barrier. The second spring piece passes through the clearance notch from the second mounting groove so that the mating part is located in the first mounting groove.

4. The headphone connector as described in claim 2, characterized in that, The welding portion of the first switch terminal includes a first horizontal connecting section bent outward from the top edge of the fixing portion of the first switch terminal to a horizontal state, and a first vertical section bent downward from the outer end of the first horizontal connecting section to a vertical state, with the lower part of the first vertical section extending to the outside of the plastic base.

5. The headphone connector as described in claim 4, characterized in that, The plastic base is provided with a first through groove extending downward from its upper surface and a first recessed groove located on its upper surface. The outer side of the first recessed groove is connected to the first through groove, and the inner side is connected to the first mounting groove. The first horizontal connecting section is placed in the first recessed groove, and the lower part of the first vertical section protrudes from the outside of the plastic base after passing through the first through groove.

6. The headphone connector as described in claim 5, characterized in that, The welding portion of the second switch terminal includes a second horizontal connecting section bent outward from the middle of the second switch terminal fixing portion in a horizontal state, and a second vertical section bent downward from the outer end of the second horizontal connecting section in a vertical state. A receiving groove with the opening facing downward is provided on the plastic base. The second horizontal connecting section abuts against the top surface of the receiving groove, and the lower part of the second vertical section protrudes out of the plastic base after passing through the opening of the receiving groove.

7. The headphone connector as described in claim 6, characterized in that, The lower part of the first vertical segment and the lower part of the second vertical segment are both sheet-like and on the same plane.

8. The headphone connector as described in claim 2, characterized in that, All metal terminals except the first and second switch terminals are signal terminals. The multiple signal terminals include one first signal terminal and multiple second signal terminals. The plastic base is provided with a first insertion groove extending upward from its lower surface. The first insertion groove is located on the same side of the socket as the first mounting groove and the second mounting groove. The first signal terminal is inserted into the first insertion groove from bottom to top. The plastic base is provided with multiple second insertion grooves extending downward from its upper surface. The multiple second insertion grooves are located on the side of the socket opposite to the first mounting groove and the second mounting groove and are arranged in the front-back direction. The multiple second signal terminals are inserted into the multiple second mounting grooves one by one from top to bottom.

9. The headphone connector as described in claim 8, characterized in that, The first signal terminal includes a vertically extending first connecting portion, a support portion extending outward from the top of the first connecting portion, a first solder foot extending downward from the outer side of the support portion, a first elastic arm, and a first contact portion. A locking groove is provided on the inner wall surface of the first mounting groove, and a hook is provided on the first connecting portion. The first connecting portion and the first solder foot respectively abut against the inner wall surface and the outer wall surface of the first mounting groove. The hook is held in the locking groove. The lower part of the first solder foot protrudes outward from the plastic base. One end of the first elastic arm is connected to the first connecting portion, and the first contact portion is located at the other end of the first elastic arm.

10. The headphone connector as described in claim 8, characterized in that, The second signal terminal includes a vertically extending second connecting portion, a second solder foot, a second elastic arm, and a second contact portion. One end of the second elastic arm is connected to the second connecting portion, and the second contact portion is located at the other end of the second elastic arm. The second solder foot includes a first segment extending horizontally outward from the second connecting portion and a second segment extending downward from the outer end of the first segment. The plastic base is provided with a second through groove extending downward from its upper surface and a second recessed groove located on its upper surface. The outer side of the second recessed groove is connected to the second through groove, and the inner side is connected to the second insertion groove. The first section of the second welding foot is placed in the second recessed groove, and the second section extends downward through the second through groove and protrudes out of the plastic base.

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