Coaxial connector

Abstract

The utility model discloses a coaxial connector. The coaxial connector comprises an insulating base, a contact terminal and a shielding shell, a protruding part is arranged in the middle of the insulating base, an inserting hole is formed in the center of the protruding part, a positioning groove with a clamping hole is annularly formed in the outer side of the protruding part, and a chamfer and an inclined transition face are arranged on the outer edge of the upper portion of the protruding part. The contact terminal comprises a terminal welding pin embedded in the bottom of the insulating base, and two mirror symmetry elastic contact arms which are bent upwards and extend into the plugging hole. An annular shell of the shielding shell is sleeved with the positioning groove, the bottom of the outer side wall of the annular shell is provided with an inverted buckle buckled with the clamping hole, the top of the annular shell is provided with a flaring part, the bottom of the annular shell extends to form a supporting leg and a shell welding leg, and the bottom of the clamping hole is provided with an observation window. According to the utility model, through optimizing the clamping position and additionally arranging an auxiliary structure, the miniature size design is realized, the plugging smoothness, the connection stability and the assembly reliability are improved, and the connector is suitable for miniaturized electronic equipment.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of electric connector especially relates to a coaxial connector. BACKGROUND

[0002] With the rapid development of the fields of Internet of Things, 5G communication, intelligent wearable devices and the like, electronic devices are evolving towards miniaturization and integration, which puts an increasingly urgent demand on the miniaturization of connectors. Under the premise of ensuring the electrical performance and mechanical strength of the connector, how to further compress the product structure space becomes a severe challenge faced by the industry. The size of the traditional miniature coaxial connector is relatively large, which is difficult to meet the stringent requirements of the new generation of electronic devices on the space of the circuit board. For example, in some applications, the outer dimension of the miniature coaxial connector needs to be compressed to about 1.9mm x 1.9mm x 0.52mm, so as to make more space for other elements on the limited PCB. However, the substantial reduction in size often leads to problems such as a decrease in the structural strength of the connector, assembly difficulties and unstable electrical performance. Therefore, it is necessary to design a small coaxial connector with compact structure, easy assembly and reliable performance to meet the market demand for ultra-small size connectors. SUMMARY

[0003] The utility model aims at providing a coaxial connector to solve the prior art's insufficient.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0005] A coaxial connector, comprising an insulating base, a contact terminal and a shielding shell, wherein the insulating base is provided with a protruding part in the center, the protruding part is provided with a plug-in hole in the middle part, and a positioning groove with at least one clamping hole is arranged around the outer side of the protruding part; the contact terminal comprises a terminal solder leg embedded in the bottom of the insulating base and an elastic contact arm bent upward and extending into the plug-in hole; the shielding shell comprises an annular shell with an open side and a shell solder leg formed by extending outward from the bottom of the annular shell, the outer side wall of the annular shell is provided with a reverse buckle corresponding to the position of the clamping hole, and the reverse buckle is located at the bottom of the annular shell and is buckled and combined with the lap joint surface in the clamping hole.

[0006] Further, the positioning groove is surrounded by a groove bottom plane, a first side wall and a second side wall, wherein the first side wall is the outer peripheral surface of the protruding part, and the second side wall is the inner peripheral surface of the insulating base body; the clamping hole is opened at the edge corner position where the groove bottom plane and the second side wall intersect.

[0007] Further, an observation window is opened at the bottom of the clamping hole, and the orthographic projection area of the observation window is greater than the opening area of the clamping hole.

[0008] Further, the bottom part of the annular shell extends downward to form a plurality of supporting feet in abutment with the bottom plane of the slot.

[0009] Further, a chamfer and an inclined transition surface are arranged at the upper outer edge of the protruding part, and the top edge of the annular shell is expanded outward to form a flared part.

[0010] Further, the welding feet of the shell have at least two, which are symmetrically arranged on both sides of the annular shell and are in the shape of long strip.

[0011] Further, the elastic contact arms have two and are arranged in mirror symmetry.

[0012] Compared with the prior art, the coaxial connector has the beneficial technical effects that:

[0013] 1. Minimal design is realized: the clamping structure is transferred to the outside of the shielding shell, avoiding occupying the internal plug-in space, which not only eliminates the interference risk with the plug-in connector, but also effectively reduces the axial height, and guarantees the normal plug-in function of the coaxial connector under the condition of minimal size.

[0014] 2. Connection stability is enhanced: a plurality of reverse buckles are correspondingly buckled with the clamping holes to form multi-point fixation, in addition, in combination with the elastic deformation characteristics of the shielding shell, the buckling reliability can be further strengthened through the slight expansion of the shielding shell during plug-in, and the loosening during use is effectively prevented.

[0015] 3. Assembly and protection performance are optimized: the observation window at the bottom of the clamping hole can directly confirm the buckling state, and the assembly efficiency is improved; the supporting feet at the bottom of the annular shell can absorb stress during excessive plug-in, avoid deformation of the butt joint port, and prolong the service life of the product. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings in the following description are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings. In the drawings:

[0017] Figure 1 The drawings show the overall structure of a coaxial connector according to an embodiment of the present application;

[0018] Figure 2 The drawings show the bottom structure of a coaxial connector according to an embodiment of the present application;

[0019] Figure 3 The drawings show a top view of a coaxial connector according to an embodiment of the present application;

[0020] Figure 4 The drawings show a sectional view of a coaxial connector along A-A according to an embodiment of the present application;

[0021] Figure 5 A structure schematic view of an insulating base and a contact terminal in a coaxial connector is provided for the embodiment of the utility model;

[0022] Figure 6 A structure schematic view of a shielding shell in a coaxial connector is provided for the embodiment of the utility model.

[0023] In the drawings, the component list represented by each sign is as follows:

[0024] 1-insulating base, 11-protruding part, 12-plug hole, 13-transition surface, 14-positioning groove, 15-clamping hole, 16-viewing window, 2-contact terminal, 21-terminal soldering leg, 22-elastic contact arm, 3-shielding shell, 31-annular shell, 32-shell soldering leg, 33-inverted buckle, 34-supporting leg, 35-flared part. Specific implementation

[0025] The technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0026] As Figures 1 to 6 shown, the utility model embodiment provides a kind of coaxial connector, including insulating base 1, contact terminal 2 and shielding shell 3.Specifically:

[0027] Insulating base 1 is made of plastic material, and the whole is rectangular block (also can be designed as circular or other shape according to need). The middle part of insulating base 1 is provided with cylindrical protruding part 11, and plug hole 12 is coaxially provided in the center of protruding part 11, for the center conductor (not shown in figure) of the center of the plug-in socket is inserted.Protruding part 11 upper outer edge is equipped with chamfer and inclined transition surface 13, so that the plug-in process with adaptive connector is more smooth.Protruding part 11 is provided with a circle of positioning groove 14 around the outside, and the positioning groove 14 is recessed from the upper surface of insulating base 1 downward.The positioning groove 14 is surrounded by groove bottom plane, first side wall and second side wall, wherein the first side wall is the outer circumferential surface of protruding part 11, and the second side wall is the inner circumferential surface of the body of insulating base 1;A plurality of clamping holes 15 are provided in the positioning groove 14, and the clamping holes 15 have lapping surfaces, which are used for the snap-fit assembly of shielding shell 3, and in the embodiment, the clamping holes 15 are three, to ensure the stability of the connection between insulating base 1 and shielding shell 3, and the clamping holes 15 are specifically provided at the edge corner position where groove bottom plane and second side wall intersect.

[0028] The contact terminal 2 is stamped from a metal material and comprises a terminal soldering leg 21 and an elastic contact arm 22. The terminal soldering leg 21 is in a sheet shape and is integrally embedded in the bottom of the insulating base 1 by an insert injection molding process. The bottom surface of the terminal soldering leg 21 is exposed to the bottom surface of the insulating base 1 to be soldered to the circuit board. The elastic contact arm 22 is in two mirror-symmetrical parts. The two elastic contact arms 22 are respectively extended upward from the two sides of the terminal soldering leg 21 and are bent to extend into the plug-in hole 12 to form an elastic contact part. When the center conductor of the mating connector is inserted into the plug-in hole 12, the two elastic contact arms 22 are elastically opened and clamped to the center conductor to realize stable electrical contact.

[0029] The shielding shell 3 is stamped and bent from a metal sheet and comprises a ring-shaped shell 31 and a shell soldering leg 32. The ring-shaped shell 31 is in a cylindrical structure with an open side and is nested in the positioning groove 14 of the insulating base 1. The top edge of the ring-shaped shell 31 is expanded outward to form a flared part 35 in a trumpet shape to facilitate the alignment of the mating connector. The shell soldering leg 32 is formed by extending outward from the bottom of the side wall of the ring-shaped shell 31 and is in a strip-shaped sheet shape in this embodiment. The shell soldering leg 32 is at least two and is symmetrically located on the two sides of the ring-shaped shell 31 to be soldered to the circuit board. Through the soldering of the shell soldering leg 32 to the circuit board, the shielding shell 3 is not only mechanically fixed but also connected to the ground layer of the circuit board to play an electromagnetic shielding role.

[0030] The bottom of the outer side wall of the ring-shaped shell 31 is provided with three reverse buckles 33 corresponding to the card holes 15 of the insulating base 1. The reverse buckles 33 are formed by protruding outward from the outer side wall of the ring-shaped shell 31 and have a certain elasticity. The lower surface of the reverse buckle 33 is formed with a guide slope. When the shielding shell 3 is buckled downward to the insulating base 1, the guide slope of the reverse buckle 33 will first contact the edge of the card hole 15 and elastically deform under pressure to smoothly slide into the card hole 15. Then the reverse buckle 33 restores the shape to be lapped and buckled on the lapping surface of the card hole 15, so as to firmly fix the shielding shell 3 on the insulating base 1. The utility model shifts the clamping structure to the outer side of the shielding shell 3. When the connector is plugged, the shielding shell 3 can be slightly expanded and deformed outward, so that the reverse buckle 33 and the card hole 15 of the insulating base 1 form a more tight buckling, which significantly improves the structural stability of the connection and effectively avoids the loosening during use. At the same time, the clamping structure does not occupy the plug-in space inside the shielding shell 3 and does not interfere with the connector during plugging, thereby effectively reducing the axial height of the coaxial connector and ensuring the normal plug-in function of the coaxial connector in a minimized size.

[0031] As a preferred embodiment, the bottom of the annular shell 31 is further provided with a plurality of spaced support feet 34 formed by the downward extension of the part of the shell at the bottom of the annular shell 31. When the connector is subjected to a large axial stress during the plugging process, the support feet 34 will abut against the bottom plane of the slot and be deformed, thereby supporting and protecting the annular shell 31 to a certain extent, preventing the direct deformation and damage of the mating port at the top of the annular shell 31 during over-force plugging.

[0032] Further, the bottom of each card hole 15 is further provided with a small observation window 16, the orthographic projection area of the observation window 16 is larger than the opening area of the card hole 15, forming a stepped perspective structure, through which the inverted buckle 33 of the shielding shell 3 can be seen whether it has been completely buckled into the card hole 15.

[0033] The assembly process of the utility model is as follows: first, embed the contact terminal 2 in the insulating base 1 (can be embedded in the terminal by injection molding or subsequent pressure-in method), so that the terminal soldering leg 21 is fixed at the bottom of the base, and the elastic contact arm 22 is located in the plug-in hole 12; then, the shielding shell 3 is sleeved and surrounded outside the protruding part 11 from the top, so that the annular shell 31 is located in the positioning groove 14 of the insulating base 1, and is pressed downward in alignment with the card hole 15 until the inverted buckle 33 is buckled into the card hole 15 and locked. At this time, it can be checked through the observation window 16 whether each buckle is completely buckled in place. After confirming that the assembly is completed, place the entire connector on the circuit board, so that the terminal soldering leg 21 and the shell soldering leg 32 are aligned with the pads on the circuit board, and are welded and fixed by reflow soldering process, so as to strengthen the mechanical stability and grounding effect.

[0034] The above-described embodiments only express the implementation of the utility model, which is described in detail, but it cannot be understood as a limitation on the scope of the utility model patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A coaxial connector, characterized by, The application relates to an insulation base (1) with a protruding part (11) in the center, wherein a plug-in hole (12) is arranged in the middle of the protruding part (11), a positioning groove (14) with at least one clamping hole (15) is arranged around the outer side of the protruding part (11), a contact terminal (2) comprising a terminal pin (21) embedded in the bottom of the insulation base (1) and an elastic contact arm (22) bent upwards and extending into the plug-in hole (12), and a shielding shell (3) comprising an annular shell (31) with an open side and a shell pin (32) formed by extending the bottom of the annular shell (31) outward, wherein a reverse buckle (33) corresponding to the position of the clamping hole (15) is arranged on the outer side wall of the annular shell (31), and the reverse buckle (33) is located at the bottom of the annular shell (31) and is buckled and combined with the lap joint surface in the clamping hole (15). The positioning groove (14) is surrounded by a groove bottom plane, a first side wall and a second side wall, wherein the first side wall is the outer peripheral surface of the protruding part (11), and the second side wall is the inner peripheral surface of the body of the insulation base (1); the clamping hole (15) is arranged at the edge corner position where the groove bottom plane and the second side wall intersect. An observation window (16) is arranged at the bottom of the clamping hole (15), and the normal projection area of the observation window (16) is larger than the opening area of the clamping hole (15). A plurality of supporting feet (34) abutting against the groove bottom plane are formed at the bottom of the annular shell (31).

2. A coaxial connector as recited in claim 1, wherein: A chamfer and an inclined transition surface (13) are arranged at the upper outer edge of the protruding part (11), and the top edge of the annular shell (31) is expanded outward to form a flared part (35).

3. A coaxial connector as recited in claim 1, wherein: The shell pin (32) has at least two long strip-shaped pieces arranged symmetrically on both sides of the annular shell (31).

4. A coaxial connector as recited in claim 2, wherein: The elastic contact arm (22) has two mirror-symmetric pieces.

5. A coaxial connector as recited in claim 1, wherein: ​ 6. A coaxial connector as recited in claim 1, wherein: ​ 7. A coaxial connector as recited in claim 1, wherein: ​

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