Anti-static SMB connector

Abstract

The utility model discloses an anti-static SMB connector, which comprises a plastic shell, a metal main body, an insulator and a central pin, the metal main body is arranged in the plastic shell, the insulator is arranged in the metal main body, the central pin is arranged in the insulator in a penetrating manner, and the anti-static SMB connector is characterized in that the plastic shell is coated outside the metal main body through injection molding; the plastic housing is provided with an insulation installation part used for installation and fixation, and the insulation installation part is provided with a first through hole used for screw locking. According to the utility model, a traditional metal shell mounting structure is innovatively changed into a plastic shell mounting structure, so that the problem that static electricity is generated due to friction among metals when screws are locked and attached is fundamentally avoided, and the static electricity is effectively prevented from being conducted to the interior of the display panel through the connector in the testing and using processes; therefore, the reliability of the imaging quality and the test result is guaranteed, and meanwhile, the internal metal main body is reserved to ensure good electromagnetic shielding performance and mechanical strength.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of radio frequency coaxial connector, especially relates to a kind of anti-static SMB connector. BACKGROUND

[0002] SMB (Sub-Miniature version B) connector is the radio frequency coaxial connector commonly used in the display panel test and whole machine signal interface. The traditional SMB connector mainly includes metal shell, insulator and center pin arranged in the insulator. The metal shell is usually made of copper alloy or aluminum alloy by machining as a whole, and has the functions of structural support and grounding.

[0003] When the SMB connector is installed to the display panel shell, it needs to be fixed by metal screw locking at both ends of the metal shell. The process has the following shortcomings:

[0004] 1. Static generation and conduction

[0005] During the locking process, the metal screw and the threaded hole of the metal shell rub repeatedly, and a large amount of static charge is generated instantaneously;

[0006] Since the metal shell is in direct contact with the display panel shell, the static charge is directly transmitted to the driving circuit and signal line inside the display panel through the metal shell;

[0007] During the subsequent power-on test phase, electrostatic discharge (ESD) pulse will interfere with the panel pixel driving timing, resulting in imaging noise, stripes or screen flashing, and ultimately affecting the accuracy of test results.

[0008] 2. Static coupling in use stage

[0009] After the display panel is put into use, the static electricity in the environment (such as personnel touch, air flow, tool contact) can also enter the panel inside through the exposed metal screw and metal shell;

[0010] Long-term accumulated electrostatic discharge may cause potential damage to pixel units or driving IC, reducing product reliability.

[0011] In summary, the traditional all-metal SMB connector has the risk of static conduction during assembly and use, and it is difficult to meet the strict requirements of high-sensitivity display panels for static protection. Therefore, it is necessary to develop a new connector structure that can effectively block the static conduction path while ensuring mechanical fixation and radio frequency performance, to avoid the influence of static electricity on display panel testing and subsequent use. UTILITY MODEL CONTENTS

[0012] The utility model discloses a purpose lies in providing a kind of anti-static SMB connector, by the split composite structure of plastic shell and conductive metal main body, make locking screw only contact with plastic shell, to cut off electrostatic conduction path in the whole process of assembly and use, avoid the influence of static electricity to display panel test and subsequent use.

[0013] To achieve the above object, the utility model provides the following technical scheme:

[0014] A kind of anti-static SMB connector, including shell, the main body in the shell, the insulator in the main body and the center needle in the insulator, the shell is plastic piece, the main body is conductive metal piece, the shell is integrally connected with the main body by injection molding.

[0015] Further, the first channel is provided on the shell along the axial direction, and the main body is at least partially disposed in the first channel, the second channel is provided on the main body along the axial direction, and the insulator and the center needle are disposed in the second channel.

[0016] Further, the center needle is provided with a blocking portion at both ends thereof located in the insulator to limit the axial displacement of the center needle relative to the insulator.

[0017] Further, the main body is provided with a first positioning portion at one end thereof corresponding to the insulator, and the insulator is correspondingly provided with a first groove, and the first groove is provided along the circumferential direction of the insulator; the first positioning portion is a plurality of protrusions protruding into the second channel from the main body, and the plurality of protrusions are spaced apart along the circumferential direction at the same height of the main body to limit the axial displacement of the insulator.

[0018] Further, the main body includes a shaft portion and a flange portion, an annular groove is provided in the middle portion of the flange portion, and a sealing ring is provided in the annular groove; one end of the shell is provided with a receiving groove for accommodating the flange portion, a second groove is provided in the flange portion, and a second positioning portion is correspondingly provided in the shell.

[0019] Further, a positioning groove is provided in the main body at the annular groove for positioning during injection molding.

[0020] Further, a third positioning portion is protrudingly provided in the first channel of the shell, and a third groove is correspondingly provided in the outer surface of the main body.

[0021] Further, glue is applied between the shell and the main body, and between the main body and the center needle and the insulator.

[0022] Further, a first through hole is provided in the side of the shell at the receiving groove, and a second through hole is provided in the main body for embedding and fixing.

[0023] Further, the main body is provided with a dosing part, which is kept a certain distance from the inner wall of the first channel of the shell to accommodate the glue.

[0024] Compared with the prior art, the beneficial technical effects are:

[0025] The utility model discloses a kind of anti-static SMB connectors, by screw lock structure is arranged on plastic shell, prevent the friction between metal and metal, to eliminate the generation of static electricity from source, greatly improve the yield and reliability of display panel test;In subsequent use, the static charge of external environment cannot be directly conducted to equipment interior by mounting screw, because plastic shell is excellent insulator, effectively cut off this conduction path, improve the anti-static ability and long-term use stability of complete machine;Metal main body structure inside is retained, ensure the electromagnetic shielding (EMI) performance of connector necessary, mechanical strength and the integrity of signal transmission;And injection molding integrated process makes structure more compact and reliable, while the sealing ring design of flange part guarantees the environmental sealing property at panel interface. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings in the following description are only some embodiments, and other drawings can be obtained according to these drawings without creative labor for ordinary skilled in the art.In the drawings:

[0027] Figure 1 It is the whole structure schematic view of a kind of anti-static SMB connector preferred embodiment of the utility model;

[0028] Figure 2 It is the explosion structure drawing of a kind of anti-static SMB connector preferred embodiment of the utility model;

[0029] Figure 3 It is the front view of a kind of anti-static SMB connector preferred embodiment of the utility model;

[0030] Figure 4 It is Figure 3 Sectional view in A-A of

[0031] Figure 5 It is Figure 3 Sectional view in B-B of

[0032] In the drawings, the component list represented by each mark is as follows:

[0033] 1, housing; 101, first channel; 102, containing groove; 103, second positioning part; 104, third positioning part; 105, first through hole; 2, main body; 201, second channel; 202, first positioning part; 203, shaft part; 204, flange part; 205, annular groove; 206, second groove; 207, positioning groove; 208, third groove; 209, second through hole; 210, dosing part; 3, insulator; 301, first groove; 4, center needle; 401, blocking part; 5, sealing ring; 6, glue. DETAILED DESCRIPTION

[0034] The technical solutions 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 work belong to the scope of protection of the utility model.

[0035] As shown in the utility model embodiment provides a kind of anti-static SMB connector, including housing 1, the main body 2 of being arranged in housing 1, the insulator 3 of being arranged in main body 2 and the center needle 4 of being arranged in insulator 3, housing 1 is insulating plastic piece, main body 2 is conductive metal piece, housing 1 is integrally connected with main body 2 by injection molding, forms integrated piece. Figures 1 to 5

[0036] Main body 2 keeps conductivity as signal transmission path, and housing 1 blocks static transmission as insulating barrier.

[0037] Plastic housing 1 preferably adopts PBT or polyamide material, with high dielectric strength and heat resistance. By injection molding mode is covered in part shaft 203 and flange part 204 outside of metal main body 2, make two combination as a whole, form integral type frame. Before injection molding, preferably the metal surface of main body 2 is treated by plasma to enhance the adhesion with plastic. In the injection molding process, main body 2 is placed in mold as insert, and the outer surface of main body 2 is wrapped with molten plastic and solidified to form a seamless connection.

[0038] Insulating mounting part is arranged on plastic housing 1 for fixing with external connecting piece.

[0039] It designs the traditional all-metal housing 1 as composite structure of outer plastic and inner metal. Threaded hole (i.e. first through hole 105) for installing screw is completely opened on insulating mounting part of plastic material. In this way, during the process of locking screw, screw only rubs with plastic housing 1, which fundamentally avoids the problem of static electricity caused by friction between metals, and cuts off the generation and conduction path of static electricity from the source. At the same time, the metal main body 2 reserved inside ensures the need of signal shielding and the strength of structure.​

[0040] The first channel 101 is axially formed on the shell 1, and the shaft portion 203 of the main body 2 is at least partially arranged in the first channel 101. The second channel 201 is axially formed on the main body 2, and the insulator 3 and the center pin 4 are coaxially arranged in the second channel 201. Specifically, the inner diameter of the first channel 101 is slightly larger than the outer diameter of the shaft portion 203 of the main body 2, and the tolerance fit is H7 / g6, which ensures that the plastic is uniformly coated during injection molding. The second channel 201 is a precision hole cavity, and the inner surface roughness Ra is ≤0.8 μm, so as to reduce signal reflection.

[0041] Further, a chamfer is formed on the shell 1 at the end of the first channel 101 away from the main body 2, and a chamfer is also formed on the main body 2 at the end of the second channel 201 away from the shell 1, so as to facilitate quick alignment when the connector is connected to the outside.

[0042] The center pin 4 is provided with a blocking portion 401 at each end of the insulator 3, so as to limit the axial displacement of the center pin 4 relative to the insulator 3. The blocking portion 401 is a boss structure formed on the surface of the center pin 4 by stamping or turning process, and abuts against the end face of the insulator 3 to limit the axial displacement of the center pin 4 relative to the insulator 3 (the maximum allowable displacement is ≤0.05 mm). This design prevents the center pin 4 from slipping due to vibration during plugging, avoids arc discharge caused by poor contact, and ensures the stability of the display panel test signal.

[0043] Alternatively, the blocking portion 401 can also be replaced by an elastic snap ring embedded in the annular groove 205 of the center pin 4.

[0044] The main body 2 is provided with a first positioning portion 202 at one end corresponding to the insulator 3, and the insulator 3 is correspondingly provided with a first recess 301. The first recess 301 is formed along the circumference of the insulator 3, and the first recess 301 is a circular groove with a certain depth. Alternatively, the first recess 301 can be a plurality of arc-shaped grooves spaced apart along the circumference. Specifically, the first positioning portion 202 is a plurality of protrusions or ribs protruding into the second channel 201 of the main body 2. The plurality of protrusions or ribs are arranged at the same height of the main body 2 and spaced apart along the circumference. The protrusions or ribs are clamped into the first recess 301 to limit the axial displacement of the insulator 3. This positioning structure ensures that the position of the insulator 3 is stable during frequent plugging and testing, and avoids signal fluctuation caused by slight displacement.

[0045] Alternatively, the first positioning portion 202 can be replaced by a spiral protrusion matched with a spiral groove on the insulator 3 to realize rotary locking.

[0046] The main body 2 is preferably made of brass, and comprises a shaft portion 203 and a flange portion 204 extending perpendicularly to the shaft portion 203. A coaxial annular groove 205 is formed in the middle of the flange portion 204, and a sealing ring 5 is embedded in the annular groove 205, used to form a sealed connection with the display panel housing 1. The sealing ring 5 is specifically a silica gel O-ring. An accommodating groove 102 is formed at one end of the housing 1 to accommodate the flange portion 204. A second groove 206 is formed on the flange portion 204, and a second positioning portion 103 is correspondingly arranged on the housing 1. Through the injection molding process, the flange portion 204 located at the second groove 206 is arranged in the accommodating groove 102 of the housing 1 and located at the second positioning portion 103, so as to realize axial and circumferential limiting and fixing of the main body 2.

[0047] A first through hole 105 is formed on the housing 1 near the accommodating groove 102, used to be connected with the outside. A second through hole 209 is correspondingly arranged on the main body 2, and the axes of the two holes are aligned and overlapped. During assembly, the connector is fixed by penetrating the two holes with a screw.

[0048] The flange portion 204 is embedded in the plastic housing 1, and the insulating mounting portion is the end portion of the plastic housing 1 covering the flange portion 204. The first through hole 105 penetrates the insulating mounting portion, and the flange portion 204 is correspondingly provided with the second through hole 209 for the screw to pass through. The first through hole 105 and the second through hole 209 are both light holes, the diameter of the first through hole 105 is larger than that of the second through hole 209, and after injection molding, the first through hole 105 and the second through hole 209 are overlapped with each other, and the diameters of both are larger than the diameter of the screw rod of the mounting screw.

[0049] A positioning groove 207 is formed on the main body 2 at the annular groove 205, used for positioning during injection molding. The positioning groove 207 cooperates with the mold pin during the injection molding process to ensure accurate positioning of the main body 2 in the mold, avoiding deviation to cause uneven wall thickness of the housing 1. The axial position of the positioning groove 207 is 0.5-1.0 mm away from the edge of the annular groove 205, which does not affect the installation of the sealing ring 5, and can provide a reliable positioning reference.

[0050] A third positioning portion 104 is protrudingly arranged in the first channel 101 of the housing 1, and a third groove 208 is correspondingly arranged on the outer surface of the main body 2, and the two are buckled to realize axial positioning. The third positioning portion 104 and the third groove 208 are in interference fit (with an interference amount of 0.01-0.03 mm), which provides additional circumferential locking force after injection molding, preventing the main body 2 from rotating relative to the housing 1. This design is especially suitable for high-frequency applications, avoiding impedance mutation caused by rotation. Further, the third groove 208 is filled with conductive glue, which enhances positioning and improves electrostatic discharge efficiency.

[0051] Glue 6 is applied between the shell 1 and the main body 2, and between the main body 2 and the center pin 4 and the insulator 3, to strengthen the fixed connection. The glue 6 is preferably a single-component epoxy resin, with low ion content (≤10ppm) and fast curing characteristics (curing at room temperature for 24 hours). After application, a 0.01-0.05mm thick adhesive layer is formed, eliminating the fretting gap, suppressing triboelectricity, and at the same time improving the overall mechanical strength.

[0052] A dosing portion 210 is provided on the main body 2 near the third groove 208, which is a radial protrusion. The dosing portion 210 is kept at a distance from the inner wall of the first channel 101 of the shell 1, to ensure the amount of glue 6 applied when applying the glue 6, so as to prevent the glue 6 from being applied too much to affect the normal use of the connector.

[0053] Embodiment working process:

[0054] In the display panel test scene, when the connector of the utility model is installed between the test equipment and the panel, the operator uses a screw to lock through the first through hole 105. Since the first through hole 105 is located in the plastic shell 1 area, the screw almost does not generate static electricity during contact with the plastic, avoiding the high voltage static electricity generated when locking the traditional metal shell 1. Even in a dry environment or under fast locking conditions, the connector of the utility model can ensure that static electricity is not transmitted to the internal circuit of the display panel through the connector. In the subsequent test process, the main body 2 remains good conductivity as a signal transmission path, and the plastic shell 1 effectively blocks the intrusion path of environmental static electricity as an insulating barrier. The multiple positioning structure ensures that each component is not displaced, the sealing ring 5 prevents the intrusion of pollutants, and the glue 6 eliminates fretting, thereby maintaining stable signal transmission and static isolation performance throughout the test cycle.

[0055] In summary, the utility model not only guarantees the high-frequency performance of the SMB connector, but also fundamentally solves the problem of static interference in display panel testing and application, has significant industrial application value, and is particularly suitable for precise testing scenes of high-resolution display panels (such as 4K / 8K OLED, Micro-LED).

[0056] The above-described embodiments only express the implementation of the utility model, and the description is more specific and detailed, 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 are within the scope of protection of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. An anti-static SMB connector, characterized in that, It includes a shell (1), a main body (2) disposed inside the shell (1), an insulator (3) disposed inside the main body (2), and a center pin (4) inserted inside the insulator (3). The shell (1) is a plastic part, and the main body (2) is a conductive metal part. The shell (1) is integrally connected to the main body (2) by injection molding.

2. The anti-static SMB connector according to claim 1, characterized in that: The outer shell (1) has a first channel (101) extending through it along the axial direction. The main body (2) is at least partially disposed in the first channel (101). The main body (2) has a second channel (201) extending through it along the axial direction. The insulator (3) and the center needle (4) are disposed in the second channel (201).

3. An anti-static SMB connector according to claim 1 or 2, characterized in that: The center needle (4) is provided with blocking portions (401) at both ends of the insulator (3) to limit its axial displacement relative to the insulator (3).

4. An anti-static SMB connector according to claim 2, characterized in that: The main body (2) is provided with a first positioning part (202) at one end corresponding to the insulator (3), and the insulator (3) is provided with a first groove (301) in the same direction. The first groove (301) is opened along the circumference of the insulator (3). The first positioning part (202) is a plurality of protrusions protruding from the main body (2) into the second channel (201). The plurality of protrusions are arranged at the same height of the main body (2) along the circumference to limit the axial displacement of the insulator (3).

5. An anti-static SMB connector according to claim 1, characterized in that: The main body (2) includes a shaft (203) and a flange (204). An annular groove (205) is provided in the middle of the flange (204), and a sealing ring (5) is provided on the annular groove (205). One end of the outer shell (1) is provided with a receiving groove (102) for receiving the flange (204). A second groove (206) is provided on the flange (204), and a second positioning part (103) is provided on the outer shell (1).

6. An anti-static SMB connector according to claim 5, characterized in that: A positioning groove (207) is provided on the main body (2) at the annular groove (205) for positioning during injection molding.

7. An anti-static SMB connector according to claim 2, characterized in that: A third positioning part (104) is provided protruding in the first channel (101) of the outer shell (1), and a third groove (208) is provided on the outer surface of the main body (2).

8. An anti-static SMB connector according to claim 1, characterized in that: Adhesive (6) is applied between the outer shell (1) and the main body (2), and between the main body (2) and the center pin (4) and the insulator (3).

9. An anti-static SMB connector according to claim 5, characterized in that: The outer shell (1) is provided with a first through hole (105) on the side of the receiving groove (102), and the main body (2) is provided with a second through hole (209) for fitting and fixing.

10. An anti-static SMB connector according to claim 8, characterized in that: The main body (2) is provided with a metering part (210), which is kept at a certain distance from the inner wall of the first channel (101) of the outer shell (1) to accommodate the glue (6).

Images