SD card connector capable of improving transmission rate

Abstract

The utility model discloses an SD card connector capable of improving transmission rate. The SD card connector comprises a housing and a plurality of terminals. The shell is provided with an insertion cavity which is provided with a forward opening and is used for inserting the SD card; the plurality of terminals are arranged in the shell, each terminal is provided with a first contact part and a second contact part, the first contact part is positioned in the insertion cavity, the second contact part is exposed out of the rear end of the shell, and the plurality of terminals are provided with grounding terminals; the shell comprises an upper cover and a lower cover, and the upper cover and the lower cover are spliced up and down and define the insertion cavity; the plurality of terminals are all of a flat widened structure, the cross section of each terminal is greatly widened, the signal transmission rate is improved, meanwhile, a shielding sheet is further arranged, the shielding sheet is in short circuit with the grounding terminal, the characteristic impedance is effectively reduced, the signal transmission rate is further improved, and the shielding sheet and the insulating plate are fixed together in a hot melting mode, so that the signal transmission rate is improved. The anti-interference capability is effectively enhanced, and the signal transmission is more stable and reliable.

Description

Technical Field

[0001] The utility model relates to the technology of connector field, in particular to an SD card connector capable of improving the transmission rate. Background Art

[0002] SD card is the abbreviation of Secure Digital Card, which literally means "Secure Digital Card" in Chinese. It is a brand new memory card product jointly developed by Panasonic, Toshiba and SANDISK. SD memory card is a completely open standard (system), which is widely used in MP3, digital video cameras, digital cameras, e-books, AV equipment, etc., especially in ultra-thin digital cameras.

[0003] The use of SD card is inseparable from the SD card connector. The main structure of the current SD card connector includes a shell and multiple terminals; the shell has an insertion cavity with an opening facing forward and for inserting the SD card; the multiple terminals are arranged in the shell, each terminal has a first contact part and a second contact part, the first contact part is located in the insertion cavity, the second contact part is exposed at the rear end of the shell, and the multiple terminals have a ground terminal. When in use, the SD card connector is installed with an external device, each second contact part is connected to the circuit of the external device, and then the SD card is inserted into the insertion cavity, so that the SD card and each first contact part are disconnected.

[0004] However, the terminal cross-section of the above SD card connector is relatively narrow, the signal transmission rate is relatively low, and the above SD card connector does not have a shielding sheet, resulting in a very high characteristic impedance and stronger anti-interference ability, which further leads to a lower transmission rate and unstable and unreliable signal transmission. Therefore, it is necessary to improve the current SD card connector. Utility Model Content

[0005] In view of this, the present invention aims at the deficiencies of the prior art, and its main purpose is to provide an SD card connector that can improve the transmission rate, which can effectively solve the problem of low transmission rate of the existing SD card connector.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An SD card connector capable of improving the transmission rate includes a housing and a plurality of terminals; the housing has an insertion cavity with an opening facing forward for inserting an SD card; the plurality of terminals are all arranged inside the housing, and each terminal has a first contact portion and a second contact portion. The first contact portion is located in the insertion cavity, and the second contact portion is exposed at the rear end of the housing. Among the plurality of terminals, there is a ground terminal; the housing includes an upper cover and a lower cover, and the upper cover and the lower cover are spliced up and down to enclose the aforementioned insertion cavity; the plurality of terminals are all of a flat and widened structure, and the plurality of terminals are integrally formed and fixed together with an insulating plate. The insulating plate is fixed on the lower cover and clamped between the upper cover and the lower cover. Moreover, a shielding sheet is heat-melted and fixed on the insulating plate. The shielding sheet is located between the upper cover and the insulating plate, covers the rear ends of the plurality of terminals, and the shielding sheet is conductively short-circuited with the ground terminal.

[0008] As a preferred solution, a plurality of fixing posts protrude from the upper surface of the insulating plate, and a plurality of fixing holes are formed in the shielding sheet. The plurality of fixing posts are respectively inserted into the plurality of fixing holes and fixed by heat melting connection. The structure is simple and the assembly is stable.

[0009] As a preferred solution, a groove is recessed in the inner wall of the lower cover, and the insulating plate is embedded in the groove for fixing, and the installation structure is stable.

[0010] As a preferred solution, a contact portion is convexly formed on the lower surface of the front side of the shielding sheet by punching, and the contact portion is in pressure short-circuit connection with the ground terminal to better reduce the characteristic impedance.

[0011] As a preferred solution, two connecting feet extend integrally backward from the rear side of the shielding sheet, and the two connecting feet are spaced apart left and right. A connecting portion extends by bending from the rear end of the ground terminal, and the connecting portion extends left and right and is simultaneously pressed against the rear ends of the two connecting feet for contact conduction to further reduce the characteristic impedance.

[0012] As a preferred solution, the ground terminal has a third contact portion and a fourth contact portion, and the third contact portion and the fourth contact portion are separated left and right. The connecting portion is integrally formed and connected between the tails of the third contact portion and the fourth contact portion, making the connection more stable and reliable.

[0013] As a preferred solution, the front end of the third contact portion is connected to the corresponding first contact portion. The front end of the fourth contact portion has a contact piece, and the contact piece is buried in the insulating plate and is in contact short-circuit with the lower surface of the shielding sheet to further improve the short-circuit effect.

[0014] As a preferred solution, a plurality of slot holes are formed at the rear end of the lower cover, and the plurality of slot holes are arranged at intervals left and right. The second contact portions of the plurality of terminals are respectively located in the corresponding slot holes, which is convenient for external contact connection.

[0015] The utility model has obvious advantages and beneficial effects compared with the prior art. Specifically, as can be seen from the above technical solutions:

[0016] By adopting a flat and widened structure for multiple terminals, the cross-section of each terminal is greatly widened, which is beneficial to improving the signal transmission rate. At the same time, a shielding sheet is further provided, and the shielding sheet is short-circuited with the grounding terminal to effectively reduce the characteristic impedance and further improve the signal transmission rate. Moreover, the shielding sheet is fixed to the insulating plate by hot melting, effectively enhancing the anti-interference ability, and the signal transmission is more stable and reliable.

[0017] To more clearly illustrate the structural features and functions of the utility model, the following will combine the drawings with specific embodiments to elaborate on the utility model in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an assembled three-dimensional schematic diagram of a preferred embodiment of the utility model;

[0019] Figure 2 is an assembled three-dimensional schematic diagram of another angle of a preferred embodiment of the utility model;

[0020] Figure 3 is an exploded view of a preferred embodiment of the utility model;

[0021] Figure 4 is an exploded view of another angle of a preferred embodiment of the utility model;

[0022] Figure 5 is a partial assembled view of a preferred embodiment of the utility model;

[0023] Figure 6 is an internal structure cross-sectional view of a preferred embodiment of the utility model;

[0024] Figure 7 is a simulation effect diagram of a preferred embodiment of the utility model.

[0025] DESCRIPTION OF THE REFERENCE NUMERALS IN THE DRAWINGS:

[0026] 10. Housing 11. Upper cover

[0027] 12. Lower cover 121. Embedded groove

[0028] 122. Slot hole 101. Insertion cavity

[0029] 20. Terminal 21. Grounding terminal

[0030] 211. Connection part 212. Third contact part

[0031] 213. Fourth contact part 214. Contact piece

[0032] 201. First contact part 202. Second contact part

[0033] 30. Insulating plate 31. Fixed column

[0034] 40. Shielding piece 41. Fixed hole

[0035] 42. Contact part 43. Connection pin. Detailed implementation manner

[0036] Please refer to Figures 1 to 6 as shown, which shows the specific structure of the preferred embodiment of the present utility model, including a housing 10 and a plurality of terminals 20.

[0037] The housing 10 has an insertion cavity 101 with an opening facing forward for inserting an SD card; the housing 10 includes an upper cover 11 and a lower cover 12, and the upper cover 11 and the lower cover 12 are spliced up and down to enclose the aforementioned insertion cavity 101. In this embodiment, the housing 10 is of a flat structure, and its contour is in the shape of an SD card, which is convenient for distinction and occupies a small space during installation. Also, the upper cover 11 is of a metal plate structure, the lower cover 12 is of an integrally injection-molded structure, an embedding groove 121 is recessed on the inner wall of the lower cover 12, and a plurality of slot holes 122 are opened at the rear end of the lower cover 12. The plurality of slot holes 122 are arranged at intervals left and right, and the plurality of slot holes 122 face downward.

[0038] The plurality of terminals 20 are all arranged inside the housing 10. Each terminal 20 has a first contact part 201 and a second contact part 202. The first contact part 201 is located in the insertion cavity 101, and the second contact part 202 is exposed at the rear end of the housing 10. Among the plurality of terminals 20, there is a ground terminal 21; the plurality of terminals 20 are all of a flat and widened structure, which is formed by stamping a metal plate. The cross-sectional width of each terminal 20 is increased by more than 30% compared with a conventional terminal. The plurality of terminals 20 are integrally formed and fixed together with an insulating plate 30. The insulating plate 30 is fixed on the lower cover 12 and clamped between the upper cover 11 and the lower cover 12. And, a shielding piece 40 is fixed on the insulating plate 30 by hot melting. The shielding piece 40 is located between the upper cover 11 and the insulating plate 30. The shielding piece 40 covers the rear ends of the plurality of terminals 20, and the shielding piece 40 is conductively short-circuited with the ground terminal 21.

[0039] In this embodiment, the second contact portions 202 of the plurality of terminals 20 are respectively located in the corresponding slot holes 122, which is convenient for external installation and connection. The insulating plate 30 is embedded and fixed in the embedding groove 121, and the installation structure is stable. A plurality of fixing posts 31 protrude from the upper surface of the insulating plate 30, and a plurality of fixing holes 41 are formed on the shielding sheet 40. The plurality of fixing posts 31 are respectively inserted into the plurality of fixing holes 41 and fixed by hot melting. The structure is simple and the assembly is stable. The fixing posts 31 are arranged in two groups that are symmetric about the left and right. Correspondingly, the fixing holes 41 are also arranged in two groups that are symmetric about the left and right. The fixing posts 31 are cylinders, and the corresponding fixing holes 41 are circular holes.

[0040] Moreover, a contact portion 42 is formed by punching and protruding on the lower surface of the front side of the shielding sheet 40. The contact portion 42 is in pressure short circuit with the grounding terminal 21 to better reduce the characteristic impedance. Two connecting legs 43 extend integrally backward from the rear side of the shielding sheet 40. The two connecting legs 43 are spaced apart left and right. A connecting portion 211 extends by bending from the rear end of the grounding terminal 21. The connecting portion 211 extends left and right and is simultaneously pressed against the rear ends of the two connecting legs 43 to be in contact conduction, so as to achieve a better short-circuit effect and further reduce the characteristic impedance.

[0041] In addition, the grounding terminal 21 has a third contact portion 212 and a fourth contact portion 213. The third contact portion 212 and the fourth contact portion 213 are separated left and right. The connecting portion 211 is integrally formed and connected between the tails of the third contact portion 213 and the fourth contact portion 213. The front end of the third contact portion 212 is connected to the corresponding first contact portion 201. The front end of the fourth contact portion 213 has a contact piece 214. The contact piece 214 is buried in the insulating plate 30 and is in contact conduction with the lower surface of the shielding sheet 40, further improving the stability and reliability of the short circuit.

[0042] The manufacturing and assembly process of this embodiment is described in detail as follows:

[0043] First, a plurality of terminals 20 are formed by stamping a metal sheet at one time. Then, the plurality of terminals 20 are placed in an injection mold to inject and form the insulating plate 30, so that the plurality of terminals 20 and the insulating plate 30 are embedded and fixed together. Then, the pre-made shielding sheet 40 is laminated on the upper surface of the insulating plate 30, and the shielding sheet 40 and the insulating plate 30 are fixed together by hot melting to form a semi-finished product. Then, the semi-finished product is embedded and fixed in the embedding groove 121 of the lower cover 12, and then the upper cover 11 and the lower cover 12 are spliced and fixed.

[0044] During use, the product is installed with an external device, and each second contact portion 202 is electrically connected to the circuit of the external device. Then, the SD card is inserted into the insertion cavity 101, so that the SD card is electrically connected to each first contact portion 201. Through simulation tests and use, such asFigure 7 As shown, the characteristic impedance value of D1 (the signal terminal on one side of multiple terminals) in this product is 73 ohms, the characteristic impedance value of D3 (the signal terminal on the other side of multiple terminals) is 80 ohms, and the characteristic impedance values of other terminals are all below 61 ohms. Thus, by increasing the cross-sectional area of the terminals, simultaneously making the grounding and shielding pins short-circuited twice, and cooperating with the heat fusion of the shielding sheet and the insulating board, there is a great improvement in the signal transmission rate, reduction of characteristic impedance, and signal transmission stability.

[0045] The design focus of this utility model lies in: by adopting a flat and widened structure for multiple terminals, the cross-section of each terminal is greatly widened, which is beneficial to improving the signal transmission rate. At the same time, a shielding sheet is further provided, and the shielding sheet is short-circuited with the grounding terminal to effectively reduce the characteristic impedance and further improve the signal transmission rate. Moreover, the shielding sheet and the insulating board are heat-fused and fixed together, effectively enhancing the anti-interference ability, and the signal transmission is more stable and reliable.

[0046] The above is only the preferred embodiment of this utility model, and does not impose any limitation on the technical scope of this utility model. Therefore, any minor modifications, equivalent changes, and decorations made to the above embodiments based on the technical essence of this utility model still fall within the scope of the technical solution of this utility model.

Claims

1. An SD card connector capable of improving transmission rate, comprising a housing and a plurality of terminals; the housing has an insertion cavity with an opening facing forward and for inserting an SD card; the plurality of terminals are arranged in the housing, each terminal has a first contact portion and a second contact portion, the first contact portion is located in the insertion cavity, the second contact portion is exposed at the rear end of the housing, and the plurality of terminals have a ground terminal; characterized in that: The shell includes an upper cover and a lower cover, which are spliced ​​up and down and enclosed to form the aforementioned insertion cavity; the multiple terminals are all flat and widened structures, and the multiple terminals are fixed together with an insulating plate by inlay molding. The insulating plate is fixed on the lower cover and clamped between the upper cover and the lower cover, and a shielding plate is hot-melt fixed on the insulating plate. The shielding plate is located between the upper cover and the insulating plate. The shielding plate covers the rear ends of the multiple terminals, and the shielding plate is short-circuited with the grounding terminal.

2. The SD card connector capable of improving transmission rate according to claim 1, characterized in that: A plurality of fixing columns are protruding from the upper surface of the insulating plate, a plurality of fixing holes are opened on the shielding sheet, and the plurality of fixing columns are respectively inserted into the plurality of fixing holes to be fixed by hot-melt connection.

3. The SD card connector capable of improving transmission rate according to claim 1, characterized in that: The inner wall of the lower cover is concavely provided with an embedding groove, and the insulating plate is embedded in the embedding groove and fixed.

4. The SD card connector capable of improving transmission rate according to claim 1, characterized in that: The upper front surface of the shielding sheet is punched out to form a contact portion on the lower surface, and the contact portion is short-circuited with the contact of the ground terminal.

5. The SD card connector capable of improving transmission rate according to claim 1, characterized in that: The rear side of the shielding sheet integrally extends two connecting pins, which are spaced apart from each other. The rear end of the grounding terminal is bent to extend a connecting portion, which extends left and right and simultaneously presses against the rear ends of the two connecting pins to achieve contact and conduction.

6. The SD card connector capable of improving transmission rate according to claim 5, characterized in that: The ground terminal has a third contact portion and a fourth contact portion, the third contact portion and the fourth contact portion are separated into left and right parts, and the connecting portion is integrally formed and connected between the tail ends of the third contact portion and the fourth contact portion.

7. The SD card connector capable of improving transmission rate according to claim 6, characterized in that: The front end of the third contact portion is connected to the corresponding first contact portion, and the front end of the fourth contact portion has a contact piece, which is buried in the insulating plate and contacts and short-circuits with the lower surface of the shielding plate.

8. The SD card connector capable of improving transmission rate according to claim 1, characterized in that: A plurality of slots are formed at the rear end of the lower cover. The plurality of slots are arranged at intervals on the left and right sides. The second contact portions of the plurality of terminals are respectively located in the corresponding slots.

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