High-speed transmission SD card connector

Abstract

The utility model relates to the technical field of electronic connectors, in particular to a high-speed transmission SD (Secure Digital) card connector, which comprises an insulating carrier, a metal shielding cover and a metal connecting terminal group, the metal connecting terminal group comprises a first terminal group and a second terminal group, the first terminal group comprises a plurality of universal terminals, the second terminal group comprises two differential signal terminal groups, the terminals of the connector are of a two-row grouping structure, the first terminal group is the universal terminals, and a conventional UHS-I protocol is read and supported; the first terminal group is a differential signal terminal group, the second terminal group is a differential signal terminal group, an NVMe 1.3 protocol is started, PCIe Gen4 single-channel full-duplex data transmission is realized, and reading and writing of SD Express 8.0 are completely adapted.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic connectors, and particularly refers to an SD card connector for medium and high-speed transmission. Background Art

[0002] The SD memory card is a new generation of memory device based on semiconductor flash memory. Due to its excellent characteristics such as small size, fast data transmission speed, and hot pluggability, it is widely used in portable devices, such as digital cameras, tablet computers, and multimedia players.

[0003] With the continuous improvement of video specifications and pixels and the rapid growth of data, the SD Association has launched a new specification for SD Express 8.0, aiming to reduce data loss and accelerate data transmission. SD Express 8.0 can provide a data transmission rate with high bandwidth and low latency, support PCIe Gen4 single-channel full-duplex data transmission, and the theoretical transmission value can reach up to 1969MB / s. Benefiting from the characteristics of high bandwidth and low latency and through the mutual cooperation of the PCIe NVMe protocol, the SD Express specification can provide performance similar to that of SSDs, providing a superior user experience for multi-application environments. SD Express 8.0 is downward compatible with existing devices and supports new devices with faster speeds and larger capacities. In order to meet the rise of various mobile multimedia devices and new storage media, a read-write connector adapted to SD Express 8.0 is required to meet the requirements of high-speed storage.

[0004] Currently, the contact terminals of some read-write connectors that support SD Express 8.0 on the market are designed with a unified structure without considering the impedance performance of the terminals, resulting in the inability to achieve the ultimate transmission performance. Summary of the Utility Model

[0005] The purpose of the utility model is to address the deficiencies of the prior art and provide an SD card connector for high-speed transmission. Its structure is scientific. By adopting a two-row grouped structure for the terminals of the connector, the first terminal group is a general terminal for reading and supporting the conventional UHS-I protocol, and the second terminal group is a differential signal terminal group that enables the NVMe 1.3 protocol to achieve PCIe Gen4 single-channel full-duplex data transmission, fully adapting to the read-write of SD Express 8.0.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An SD card connector for high-speed transmission, comprising: an insulating carrier, a metal shielding cover, and a metal connection terminal group. A cavity is provided inside the insulating carrier. The metal shielding cover is snap-connected to the insulating carrier. The metal connection terminal group and the insulating carrier are of an integrally injection-molded structure. The metal connection terminal group includes a first terminal group and a second terminal group, and a snap spring is further provided on the metal connection terminal group.

[0008] The first terminal group on the metal connection terminal group includes a plurality of general-purpose terminals, and the second terminal group includes two groups of differential signal terminal groups. Each group of differential signal terminal groups includes two differentially symmetrically arranged differential signal terminals, and a power supply terminal and a ground terminal are further provided on both sides of each group of differential signal terminal groups.

[0009] Tail soldering pins, fixed widened parts, middle narrowed parts, middle widened parts, and head contacts are provided on the differential signal terminals.

[0010] All terminals on the first terminal group and the second terminal group are provided with equally high arc-shaped raised contacts, and the raised directions of all the arc-shaped raised contacts of the terminals are towards the inside of the cavity.

[0011] A notch is provided on one side edge of the insulating carrier, and a snap boss and a guiding boss are provided on the outer side surface of the insulating carrier. A pressing spring is provided on one side edge of the metal shielding cover, fixing feet are provided at the four corners of the metal shielding cover, and a snap groove and a guiding groove are provided on the outer side surface of the metal shielding cover. The guiding groove on the metal shielding cover is correspondingly arranged with the guiding boss on the insulating carrier. The metal shielding cover and the insulating carrier are snap-connected through the cooperation of the snap groove and the snap boss, and the pressing spring on the metal shielding cover is correspondingly arranged with the notch on the insulating carrier.

[0012] The snap spring is correspondingly arranged with the pressing spring.

[0013] The above technical solution has the following beneficial effects compared with the prior art:

[0014] The SD card connector for high-speed transmission of the present utility model includes an insulating carrier, a metal shielding cover, and a metal connection terminal group. The metal shielding cover is snap-connected to the insulating carrier. The metal connection terminal group and the insulating carrier are integrally injection-molded. The metal connection terminal group includes a first terminal group and a second terminal group. The first terminal group includes a plurality of general-purpose terminals, and the second terminal group includes two groups of differential signal terminal groups. By adopting a two-row grouping structure for the terminals of the connector, the first terminal group is a general-purpose terminal to read and support the conventional UHS-I protocol, and the second terminal group is a differential signal terminal group to enable the NVMe 1.3 protocol to achieve PCIe Gen4 single-channel full-duplex data transmission and fully adapt to the reading and writing of SD Express 8.0. Description of the Drawings

[0015] Figure 1 is the structural schematic diagram of the present utility model;

[0016] Figure 2 is the schematic diagram of another direction of the present utility model;

[0017] Figure 3 is the exploded schematic diagram of the present utility model;

[0018] Figure 4 is the schematic diagram of the metal connection terminal group of the present utility model

[0019] Figure 5 is the schematic diagram of the differential signal terminal group of the present utility model. Specific embodiments

[0020] The principles and features of the present utility model will be described below with reference to the accompanying drawings. The examples given are only for explaining the present utility model and are not intended to limit the scope of the present utility model. It should be noted that the drawings are in a very simplified form and use non-precise scales, only for the purpose of conveniently and clearly assisting in explaining the purpose of the embodiments of the present utility model.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs. The terms used herein in the specification of the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or / several" used herein includes any and all combinations of one or more of the related listed items.

[0022] As Figures 1 to 5 shown: A high-speed transmission SD card connector of the present utility model includes: an insulating carrier 1, a metal shielding cover 2, and a metal connection terminal group 3. A cavity 11 is provided inside the insulating carrier 1. The metal shielding cover 2 is snap-fitted to the insulating carrier 1. The metal connection terminal group 3 and the insulating carrier 1 are integrally injection-molded. The metal connection terminal group 3 includes a first terminal group 31 and a second terminal group 32. A snap spring 30 is also provided on the metal connection terminal group 3;

[0023] The first terminal group 31 on the metal connection terminal group 3 includes a number of general terminals, and the second terminal group 32 includes two groups of differential signal terminal groups 320. Each group of differential signal terminal groups 320 includes two differentially-signal terminals 321 arranged in mirror symmetry. On both sides of each group of differential signal terminal groups 320, there are also power supply terminals 322 and ground terminals 323. The mirror-symmetrical differentially-signal terminals 321 enable the same efficiency in transmission and reception, achieving optimal transmission performance. The power supply terminals 322 and ground terminals 323 are arranged on both sides of the differentially-signal terminals 321, effectively playing a role in isolation and preventing interference.

[0024] On the differentially-signal terminal 321, there are a tail soldering pin 3210, a fixed widened part 3211, a middle narrowed part 3212, a middle widened part 3213, and a head contact 3214, thereby improving the insertion loss, reflection loss, near-end crosstalk, far-end crosstalk, and impedance performance of the differentially-signal terminal 321, as well as the resilience performance and firmness of the terminal.

[0025] All terminals on the first terminal group 31 and the second terminal group 32 are provided with arc-shaped raised contacts of the same height, and the protruding directions of all the arc-shaped raised contacts of the terminals are towards the inside of the cavity 11. The arc-shaped raised contacts of the same height are sensitive in contact, and the data transmission performance is stable.

[0026] One side edge of the insulating carrier 1 is provided with a notch 10, the outer side surface of the insulating carrier 1 is provided with a fastening boss 12 and a guiding boss 13. One side edge of the metal shielding cover 2 is provided with a pressing elastic piece 20, the four corners of the metal shielding cover 2 are provided with fixing feet 21, the outer side surface of the metal shielding cover 2 is provided with a fastening groove 22 and a guiding groove 23. The guiding groove 23 on the metal shielding cover 2 is correspondingly arranged with the guiding boss 13 on the insulating carrier 1. The metal shielding cover 2 and the insulating carrier 1 are fastened by the cooperation of the fastening groove 22 and the fastening boss 12. The pressing elastic piece 20 on the metal shielding cover 2 is correspondingly arranged with the notch 10 on the insulating carrier 1, and the engaging elastic piece 30 is correspondingly arranged with the pressing elastic piece 20;

[0027] The pressing elastic piece 20 on the metal shielding cover 2 is correspondingly arranged with the notch 10 on the insulating carrier 1. The snap connection of the metal shielding cover is convenient for disassembly and maintenance. The pressing elastic piece 20 on the metal shielding cover 2 is correspondingly arranged with the notch 10 on the insulating carrier 1. The snap connection of the metal shielding cover is convenient for disassembly and maintenance.

[0028] The utility model relates to an SD card connector with high-speed transmission. By adopting a structure in which the terminals of the connector are grouped in two rows, the first terminal group is a general terminal for reading and supporting the conventional UHS-I protocol, and the second terminal group is a differential signal terminal group that enables the NVMe 1.3 protocol to achieve PCIe Gen4 single-channel full-duplex data transmission, fully adapting to the reading and writing of SD Express 8.0. Moreover, the central gaps of the head, middle, root, and tail of the differential signal terminal, as well as the mirror-symmetrical differential signal terminal 321, are optimized through simulation design to improve the insertion loss, reflection loss, near-end crosstalk, far-end crosstalk, and impedance performance, as well as the resilience performance and firmness of the terminal.

[0029] The above are only the preferred embodiments of the utility model. Therefore, all equivalent changes or modifications made according to the structures, features, and principles described in the scope of the utility model patent application are included in the scope of the utility model patent application.

Claims

1. A high-speed transmission SD card connector, comprising: An insulating carrier (1), a metal shielding cover (2), and a metal connection terminal group (3), characterized in that: a cavity (11) is provided inside the insulating carrier (1), the metal shielding cover (2) is snap-fitted to the insulating carrier (1), the metal connection terminal group (3) and the insulating carrier (1) are an integral injection-molded structure, the metal connection terminal group (3) comprises a first terminal group (31) and a second terminal group (32), and a snap-fit ​​spring sheet (30) is also provided on the metal connection terminal group (3); The first terminal group (31) on the metal connection terminal group (3) includes a plurality of universal terminals, and the second terminal group (32) includes two groups of differential signal terminal groups (320), each group of differential signal terminal groups (320) includes two differential signal terminals (321) arranged in mirror symmetry, and each group of differential signal terminal groups (320) is also provided with power supply terminals (322) and ground terminals (323) on both sides; The differential signal terminal (321) is provided with a tail welding pin (3210), a fixed widened portion (3211), a middle narrowed portion (3212), a middle widened portion (3213), and a head contact (3214).

2. The high-speed transmission SD card connector according to claim 1, characterized in that: All terminals on the first terminal group (31) and the second terminal group (32) are provided with arc-shaped raised contacts of equal height, and the raised directions of all the terminal arc-shaped raised contacts are inside the cavity (11).

3. The high-speed transmission SD card connector according to claim 1, characterized in that: A notch (10) is provided on one side of the insulating carrier (1), a buckling boss (12) and a guide boss (13) are provided on the outer side of the insulating carrier (1), a pressure spring (20) is provided on one side of the metal shielding cover (2), fixing feet (21) are provided at four corners of the metal shielding cover (2), a buckling groove (22) and a guide groove (23) are provided on the outer side of the metal shielding cover (2), the guide groove (23) on the metal shielding cover (2) is provided corresponding to the guide boss (13) on the insulating carrier (1), the metal shielding cover (2) and the insulating carrier (1) are buckled together by the cooperation of the buckling groove (22) and the buckling boss (12), and the pressure spring (20) on the metal shielding cover (2) is provided corresponding to the notch (10) on the insulating carrier (1).

4. The high-speed transmission SD card connector according to claim 1, characterized in that: The engaging spring piece (30) is arranged corresponding to the pressure spring piece (20).

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