Electrical connector

Abstract

The present invention provides an electrical connector, which includes an insulating body and a conductive terminal, wherein the bottom wall of the insulating body is formed with a first part, a second part and a protruding part which are arranged at intervals, the contact arm of the first terminal in the conductive terminal is arranged side by side on the top wall of the insulating body, the contact arms of the second terminal and the third terminal are arranged side by side on the first part and the second part respectively, the contact arm of the fourth terminal is arranged on the protruding part, the distance between the fixing part of the fourth terminal and the welding foot in the height direction is greater than the distance between the fixing part of the second terminal and the welding foot in the height direction, each conductive terminal also has an extension part located between the fixing part and the welding foot, the extension part of the first terminal is bent downwardly and extended from its fixing part, and the extension part of the conductive terminal located on the bottom wall is arched upwardly so that its welding foot is at the same height as the welding foot of the first terminal so as to be flatly attached and welded on the circuit board. The electrical connector of the present invention effectively improves the coplanarity of the welding foot of the conductive terminal located on the bottom wall.

Description

Technical Field

[0001] The invention relates to an electric connector, and in particular to an electric connector with good coplanarity. Background Art

[0002] There are many interface specifications for electronic products such as data transmission, data storage or image display, from the widely used ATA (Advanced Technology Attachment) in the early days to SCSI (Smal lComputer System Interface), SATA (Serial Advanced Technology Attachment) and the more recent SAS interface (Serial SCSI, Serial Attached SCSI). For many emerging applications that require high-speed data transmission, serial technology can solve the performance bottleneck problem faced by traditional parallel technology. Serial Attached SCSI (SAS) is the development of parallel SCSI based on serial technology. In addition to the advantage of higher signal transmission rate, the SAS interface is also compatible with SATA drives and is much smaller than SCSI.

[0003] When the SATA interface encountered a bottleneck in transmission rate in its evolution, PCIe was used as a breakthrough, resulting in the SATA Express interface (SATA+PCIe); when the development of the SAS interface encountered a bottleneck in transmission rate, PCIe was also used to make a breakthrough, resulting in U.2 (SFF-8639), which is a combination of the SAS interface and the PCIe interface. Since the SAS interface itself is compatible with SATA, the SFF-8639 interface is compatible with connectors of SATA, SAS, SATA Express, PCIe and other specifications. The SFF-8639 connector mainly supports high-speed serial signals and power supply, and generally adopts an enhanced design, which can achieve higher reliability in compact storage applications. However, the SFF-8639 connector is small in overall size and has a large number of terminals, so the coplanarity of the terminal solder pins is difficult to guarantee.

[0004] In view of this, it is necessary to improve the existing electrical connector to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide an electrical connector with better coplanarity.

[0006] To achieve the above-mentioned invention object, the present invention provides an electrical connector for installation on a circuit board, which includes an insulating body and a plurality of conductive terminals fixed on the insulating body, the insulating body having a main body and a docking portion extending forward from the main body, the docking portion having a top wall, a bottom wall and a docking space formed between the top wall and the bottom wall, the bottom wall forming a first portion, a second portion arranged at intervals, and a protruding portion located between the first portion and the second portion and protruding in a direction away from the docking space, each conductive terminal having a fixing portion fixed to the main body, a contact arm extending forward from the front end of the fixing portion, and a solder foot located at the rear end thereof for connecting to the circuit board, the conductive terminals including a plurality of first terminals, a plurality of second terminals, a plurality of third terminals and a plurality of fourth terminals. Terminals, the contact arms of the first terminals are arranged side by side on the top wall and protrude into the docking space, the contact arms of the second and third terminals are arranged side by side on the first and second parts of the bottom wall respectively, the contact arms of the fourth terminal are arranged side by side on the protruding part of the bottom wall, the distance between the fixing part and the solder foot in the height direction of the fourth terminal is greater than the distance between the fixing part and the solder foot in the height direction of the second terminal, each of the conductive terminals also has an extension part located between the fixing part and the solder foot and connecting the two, the extension part of the first terminal is formed by extending downward from its fixing part, and the extension part of the conductive terminal located on the bottom wall is arched upward so that its solder foot is at the same height as the solder foot of the first terminal so as to be flatly attached and welded on the circuit board.

[0007] As a further improvement of the present invention, the number of bending times between the fixing portion and the corresponding soldering feet of the second terminal, the third terminal and the fourth terminal is greater than the number of bending times between the fixing portion and the soldering foot of the first terminal.

[0008] As a further improvement of the present invention, in the height direction, the soldering foot of the fourth terminal is located on the upper side of the fixing portion thereof.

[0009] As a further improvement of the present invention, the distance between the fixing portion of the fourth terminal and the soldering foot in the height direction is greater than the distance between the fixing portion of the third terminal and the soldering foot in the height direction.

[0010] As a further improvement of the present invention, there is a distance between the fixing portion of the second terminal and the soldering foot in the height direction, and there is a distance between the fixing portion of the third terminal and the soldering foot in the height direction.

[0011] As a further improvement of the present invention, the distance between the fixing portion of the second terminal and the solder foot in the height direction is the height of at least one fixing portion of the second terminal.

[0012] As a further improvement of the present invention, the electrical connector also has an insulating block injection molded outside the fixing portion of the first terminals, the insulating block has a positioning portion that cooperates with the main body of the insulating body for positioning, the main body has an installation space located on the rear side and open to the rear and installation walls located on both sides of the installation space, the positioning portion is a positioning protrusion protruding to both sides, and the installation wall is recessed with a positioning groove extending in the front-to-back direction.

[0013] As a further improvement of the present invention, the extension portion of the conductive terminal located on the bottom wall protrudes upward into a corresponding receiving groove provided on the insulating block.

[0014] As a further improvement of the present invention, the fixing portion of the first terminal has a base with a widened dimension in a lateral direction, and the width of the base is greater than the width of the contact portion and / or the solder foot thereof.

[0015] As a further improvement of the present invention, both sides of the fixing portion of the first terminal have protrusions that interfere with the aforementioned insulating body for positioning, and the protrusions are located in front of the base.

[0016] The distance in the height direction between the fixing portion and the welding foot of the fourth terminal of the electrical connector arranged on the protruding portion is greater than the distance in the height direction between the fixing portion and the welding foot of the second terminal, so that the conductive terminal located on the bottom wall can have a better coplanarity, and at the same time, the extension portion of the first terminal located on the top wall is extended downward from its fixing portion, and the extension portion of the conductive terminal located on the bottom wall is arched upward so that its welding foot is located at the same height as the welding foot of the first terminal so as to be flatly attached and welded on the circuit board, thereby making the welding foot of the conductive terminal flatly attached and welded on the circuit board to obtain good overall welding quality, and making the electrical connector a sunken plate structure to meet the low height product requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional assembly diagram of the electrical connector of the present invention installed on a circuit board.

[0018] Figure 2 yes Figure 1 Another view of the electrical connector shown.

[0019] Figure 3 yes Figure 1 A partially exploded view of the electrical connector shown.

[0020] Figure 4 yes Figure 3 Another view of the electrical connector shown.

[0021] Figure 5 Figure 3 A partial assembly view of the electrical connector shown.

[0022] Figure 6 yes Figure 3 A perspective view of a first terminal of the electrical connector shown.

[0023] Figure 7 yes Figure 3 A perspective view of a fourth terminal of the electrical connector shown.

[0024] Figure 8 yes Figure 7 A side view of a fourth terminal of the electrical connector is shown.

[0025] Fig. 9 yes Figure 3 A side view of a second terminal of the electrical connector is shown.

[0026] Fig.10 is along Figure 1 Stepped section view of midline AA. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Please refer to Figures 1 to 10 The electrical connector 100 of the present invention is shown, which is used for soldering to a circuit board 5 and includes an insulating body 1 and a plurality of conductive terminals 2 installed in the insulating body 1. The electrical connector 100 is positioned and locked on the circuit board 5 by fixing members 4 inserted on both sides of the insulating body 1.

[0029] Among them, see Figures 1 to 5 and Fig.10 As shown, the insulating body 1 is longitudinally elongated, and has a main body 11 and a docking portion 12 extending forward from the main body 11, the docking portion 12 has a top wall 101, a bottom wall 102 and a docking space 103 formed between the top wall 101 and the bottom wall 102, and the bottom wall 102 is formed with a first portion 121 and a second portion 122 arranged at intervals, and a protruding portion 123 located between the first portion 121 and the second portion 122 and protruding in a direction away from the docking space 103.

[0030] The main body 11 has a mounting surface 110, a mounting space 112 located at the rear side of the mounting surface 110 and open to the rear, and a pair of mounting walls 113 located at both sides of the mounting space 112. The inner side surface of each mounting wall 113 is concavely provided with a positioning groove 1131 extending in the front-to-back direction. The mounting surface 110 and the pair of mounting walls 113 are jointly arranged to enclose the mounting space 112. The mounting surface 110 of the main body 11 is concave forward to form a narrow groove 115. The narrow groove 115 is longitudinally elongated and extends from one mounting wall 113 to the other mounting wall 113 in the transverse direction. The positioning groove 1131 is connected to the narrow groove 115.

[0031] A plurality of the conductive terminals 2 are fixed to the insulating body 1, and each conductive terminal 2 has a fixed portion 21 fixed to the main body 11, a contact arm 22 extending forward from the front end of the fixed portion 21 to the docking portion 12, and a solder foot 24 at the rear end thereof to connect to the circuit board. The conductive terminal 2 also has an extension portion 23 located between the fixed portion 21 and the solder foot 24 and connecting the two.

[0032] The conductive terminals 2 include a plurality of first terminals 201, a plurality of second terminals 202, a plurality of third terminals 203, and a plurality of fourth terminals 204. The extension portion 23 of the first terminal 201 is formed by extending downward from its fixing portion 21. The extension portion 23 of the conductive terminal 2 (at least one group of the second, third, and fourth terminals 202, 203, and 204) located on the bottom wall 102 is arched upward to protrude upward into the corresponding receiving groove 33 provided on the insulating block 3. In this embodiment, the top surface of the extension portion 23 of the conductive terminal 2 located on the bottom wall 102 is flush.

[0033] The contact arms 22 of the first terminal 201 are arranged side by side on the top wall 101 and protrude downward into the docking space 103. The contact arms 22 of the second terminal 202 and the third terminal 203 are arranged side by side on the first part 121 and the second part 122 of the bottom wall 102, respectively. The contact arm 22 of the fourth terminal 204 is arranged side by side on the protruding portion 123 of the bottom wall. The contact arms 22 of the second terminal 202, the third terminal 203 and the fourth terminal 204 protrude upward into the docking space 103 and are arranged on both sides of the docking space 103 opposite to the contact arm 22 of the first terminal 201 along the height direction of the insulating body 1. The contact arms 22 of the second terminal 202 and the third terminal 203 are located at the same height. The contact arm 22 of the first terminal 201 is located above the contact arm 22 of the second terminal 202 in the height direction, and the contact arm 22 of the fourth terminal 204 is located below the contact arm 22 of the second terminal 202 in the height direction.

[0034] The soldering feet 24 of the second, third and fourth terminals 202, 203 and 204 are arranged in parallel and in a row in the transverse direction, and are located in front of the soldering feet 24 of the first terminal 201. In this embodiment, the extension portion 23 and soldering feet 24 of the fourth terminal 204 are formed by tearing from the rear end of the fixing portion 21 thereof, and the width of the fixing portion 21 in the transverse direction is greater than the width of the corresponding extension portion 23 and / or soldering feet 24.

[0035] Please refer to Figure 6 As shown, the fixing portion 21 of the first terminal 201 has a base 211 that is widened in the lateral direction, and the width of the base 211 is greater than the width of its contact portion 22 and / or solder foot 24. At the same time, both sides of the fixing portion 21 of the first terminal 201 have protrusions 212 that are located in front of the mounting surface 110 and interfere with the aforementioned insulating body 1, and the protrusions 212 are located in front of the base 211.

[0036] Please refer to Figure 8 , Fig. 9 As shown, in the height direction, the solder foot 24 of the fourth terminal 204 is located on the upper side of its fixing portion 21. Specifically, the distance between the fixing portion 21 of the fourth terminal 204 and the solder foot 24 in the height direction is L1, the distance between the fixing portion 21 of the second terminal 202 and the solder foot 24 in the height direction is L2, and the distance between the fixing portion 21 of the third terminal 203 and the solder foot 24 in the height direction is L3, wherein L1 is greater than L2, and L1 is greater than L3.

[0037] The distance L2 between the fixing portion 21 of the second terminal 202 and the solder foot 24 in the height direction is not zero, that is, there must be a certain distance between the fixing portion 21 of the second terminal 202 and the solder foot 24 in the height direction, and the distance L2 is the height of the fixing portion 21 of at least one second terminal 202. Similar to the second terminal 202, there must be a certain distance between the fixing portion 21 of the third terminal 203 and the solder foot 24 in the height direction, that is, L3 is not zero.

[0038] The electrical connector 100 of the present invention further comprises an insulating block 3 which is injection molded outside the fixing portion 21 of the plurality of first terminals 201, and the insulating block 3 comprises a positioning portion 31 which cooperates with the main body 11 of the insulating body 1 for positioning. In the present embodiment, the positioning portion 31 is a positioning protrusion which protrudes outward from both sides of the insulating block 3, and the positioning protrusion extends in the front-to-back direction and has a sharpened guide portion 311 at the front end so as to utilize the positioning portion 31 to be inserted into the insulating body 1. The positioning portion 31 is inserted from the back to the front into the corresponding positioning groove 1131 provided at the rear side of the main body 11 and cooperates therewith, and the insertion portion 32 provided at the front side of the insulating block 3 extends into the narrow slot 115 of the insulating body 1, and the blocking surface 30 located at the rear side of the insertion portion 32 abuts against the mounting surface 110 of the insulating body 1 forward.

[0039] The bottom of the insulating block 3 is provided with a plurality of receiving grooves 33 which are recessed upward and arranged in the transverse direction. The receiving grooves 33 are formed by a plurality of guide protrusions 34 arranged at the bottom of the insulating block 3. The extensions 23 of the conductive terminals 2 on the bottom wall 102 correspond to the receiving grooves 33 one by one and are limited by the guide protrusions 34 on both sides to ensure the position and alignment of the conductive terminals 2 on the bottom wall 102. When the insulating block 3 is assembled to the insulating body 1, the guide protrusions 34 with sharpened front ends can facilitate the insertion of the corresponding extensions 23.

[0040] The electrical connector 100 of the present invention is a sunken plate type, which effectively ensures the coplanarity of the soldering feet of a large number of first terminals 201 by injection molding the insulating block 3 outside the first terminals 201, and the soldering feet 24 of the conductive terminals 2 are located at the same height to be flatly attached and welded on the circuit board 5, making the insertion and assembly positioning of the conductive terminals 2 relatively simple.

[0041] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. An electrical connector for installation on a circuit board, comprising an insulating body and a plurality of conductive terminals fixed on the insulating body, the insulating body having a main body and a docking portion extending forward from the main body, the docking portion having a top wall, a bottom wall and a docking space formed between the top wall and the bottom wall, the bottom wall forming a first portion, a second portion arranged at intervals, and a protruding portion located between the first portion and the second portion and protruding in a direction away from the docking space, each conductive terminal having a fixing portion fixed to the main body, a contact arm extending forward from the front end of the fixing portion, and a solder foot located at the rear end thereof for connecting to the circuit board, the conductive terminals comprising a plurality of first terminals, a plurality of second terminals, a plurality of third terminals and a plurality of fourth terminals, the contact arms of the first terminals being arranged side by side on the top wall and protruding into the docking space, the contact arms of the second terminals and the third terminals being arranged side by side on the first portion and the second portion of the bottom wall, respectively, and the contact arms of the fourth terminals being arranged side by side on the protruding portion of the bottom wall, characterized in that: The distance between the fixing portion and the solder foot of the fourth terminal in the height direction is greater than the distance between the fixing portion and the solder foot of the second terminal. Each of the conductive terminals also has an extension portion located between the fixing portion and the solder foot and connecting the two. The extension portion of the first terminal is formed by bending downward and extending from its fixing portion. The extension portion of the conductive terminal located on the bottom wall is arched upward so that its solder foot is located at the same height as the solder foot of the first terminal so as to be flatly attached and soldered on the circuit board.

2. The electrical connector according to claim 1, wherein: The number of bending times between the fixing portion and the corresponding soldering feet of the second terminal, the third terminal and the fourth terminal is greater than the number of bending times between the fixing portion and the soldering foot of the first terminal.

3. The electrical connector according to claim 1, wherein: In the height direction, the soldering foot of the fourth terminal is located on the upper side of the fixing portion thereof.

4. The electrical connector according to claim 1, wherein: The distance between the fixing portion of the fourth terminal and the soldering foot in the height direction is greater than the distance between the fixing portion of the third terminal and the soldering foot in the height direction.

5. The electrical connector according to claim 4, wherein: There is a distance between the fixing portion of the second terminal and the soldering foot in the height direction, and there is a distance between the fixing portion of the third terminal and the soldering foot in the height direction.

6. The electrical connector according to claim 5, wherein: The distance between the fixing portion of the second terminal and the solder foot in the height direction is equal to the height of at least one fixing portion of the second terminal.

7. The electrical connector according to claim 1, wherein: The electrical connector also has an insulating block injection-molded outside the fixing portion of the first terminals, the insulating block has a positioning portion that cooperates with the main body of the insulating body for positioning, the main body has an installation space located at the rear side and open to the rear and installation walls located on both sides of the installation space, the positioning portion is a positioning protrusion protruding to both sides, and the installation wall is recessed with a positioning groove extending in the front-to-back direction.

8. The electrical connector according to claim 7, wherein: The extension portion of the conductive terminal located on the bottom wall protrudes upward into a corresponding receiving groove arranged on the insulating block.

9. The electrical connector according to claim 1, wherein: The fixing portion of the first terminal has a base with a widened dimension in a lateral direction, and the width of the base is greater than the width of the contact portion and / or the solder foot thereof.

10. The electrical connector according to claim 9, wherein: Both sides of the fixing portion of the first terminal are provided with protrusions for interfering with the insulating body, and the protrusions are located in front of the base.

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