Electric connector

Abstract

The utility model provides an electric connector, which can be matched with a butted electric connector, the electric connector comprises an insulating shell and a terminal module accommodated in the insulating shell, the terminal module comprises a first row of conductive terminals arranged along the transverse direction and an insulator for fixedly holding the first row of conductive terminals, and the insulating shell is provided with a second row of conductive terminals arranged along the transverse direction. Each conductive terminal comprises a holding part which is held on the insulator, a pin which downwards extends out of the insulator from one end of the holding part, an elastic base part which extends out of the insulator from the other end of the holding part and can be elastically deformed, and a contact part which is formed by further extending from the elastic base part; the first row of conductive terminals comprises a plurality of grounding terminals and a plurality of pairs of signal terminals, each pair of signal terminals is located between a pair of adjacent grounding terminals, and the thickness of the contact part of each signal terminal is smaller than that of other parts.

Description

[Technical field]

[0001] The utility model relates to an electric connector, in particular to an impedance balanced electric connector. [Background technology]

[0002] Chinese invention patent No. CN107706675B discloses an electrical connector, comprising an insulating body extending in a transverse direction, a first row of conductive terminals fixed to the insulating body, and a second row of conductive terminals opposite to the first row of conductive terminals in a width direction perpendicular to the transverse direction, wherein the conductive terminals comprise a retaining portion fixed to the insulating body, a pin extending downward from one end of the retaining portion for electrically connecting the insulating body to an external circuit board, an elastic base extending from the other end of the retaining portion and elastically deformable from the insulating body, and a contact portion further extended from the elastic base. When the contact portion abuts against the docking terminal of the docking connector, there is a large difference between the superimposed thickness of the contact portion and the docking terminal and the thickness of the elastic base, thereby causing an unbalanced characteristic impedance of the conductive terminal, and an obvious characteristic impedance mutation phenomenon of the elastic base of the conductive terminal.

[0003] Therefore, it is necessary to provide an improved electrical connector to solve the above problems. [Contents of the utility model]

[0004] The main purpose of the utility model is to provide an impedance balanced electrical connector.

[0005] In order to solve the above technical problems, the utility model can adopt the following technical solutions: an electrical connector, which can be matched with a docking electrical connector, the electrical connector includes an insulating shell and a terminal module accommodated in the insulating shell, the terminal module includes a first row of conductive terminals arranged in a transverse direction and an insulator holding the first row of conductive terminals, each of the conductive terminals includes a holding portion held by the insulator, a pin of the insulator extending downward from one end of the holding portion, an elastic base of the insulator extending from the other end of the holding portion and elastically deformable, and a contact portion further extended from the elastic base, the first row of conductive terminals includes a plurality of grounding terminals and a plurality of pairs of signal terminals, each pair of the signal terminals is located between an adjacent pair of grounding terminals, and the thickness of the contact portion of the signal terminal is less than the thickness of other parts.

[0006] Compared with the prior art, the thickness of the contact portion of the signal terminal of the electrical connector of the present invention is smaller than the thickness of other portions, thereby adjusting the impedance of the elastic base and avoiding impedance mutation between the contact portion and the elastic base after the conductive terminal is docked with the docking terminal.

Brief Description of the Drawings

[0007] Figure 1 It is a three-dimensional schematic diagram of the electric connector of the utility model.

[0008] Figure 2 yes Figure 1 A three-dimensional view of the electrical connector from another perspective.

[0009] Figure 3 It is a three-dimensional exploded view of the electric connector of the utility model.

[0010] Figure 4 yes Figure 3 Another perspective exploded view of the electrical connector.

[0011] Figure 5 yes Figure 4 A further exploded perspective view of the electrical connector is shown.

[0012] Figure 6 yes Figure 5 A perspective exploded view of the electrical connector from another perspective is shown.

[0013] Figure 7 yes Figure 6 A front view of a row of conductive terminals is shown.

[0014] Figure 8 yes Figure 7 A front view of a row of conductive terminals is shown.

[0015] Fig. 9 yes Figure 7 A side view of the conductive terminals shown is shown with both signal terminals and ground terminals.

[0016] Fig.10 yes Figure 1 A cross-sectional view of the electrical connector along line AA. [Specific implementation method]

[0017] Please refer to Figures 1 to 5 As shown, the electrical connector 100 of the utility model is used to dock with a docking connector (not shown), and the electrical connector 100 can be mounted downward on an external circuit board. The electrical connector 100 includes an insulating housing 10 and a terminal module 20 accommodated in the insulating housing 10. The terminal module 20 includes a conductive terminal 201 and an insulator 30 for holding the conductive terminal 201. The conductive terminal 201 includes a first row of conductive terminals 21 arranged in a transverse direction and a second row of conductive terminals 22 arranged in the transverse direction. The second row of conductive terminals 22 is arranged opposite to the first row of conductive terminals 21 in a width direction perpendicular to the transverse direction. The insulator 30 includes a first insulator 31 for holding the first row of conductive terminals, and a second insulator 32 for holding the second row of conductive terminals 22.

[0018] Each of the conductive terminals 201 includes a retaining portion 211 retained on the corresponding insulator 30, a pin 213 extending downward from the lower end of the retaining portion 211 and extending from the insulator 30, an elastic base 215 extending from the upper end of the retaining portion 211 and elastically deformable from the insulator 30, and a contact portion 217 further extending upward from the elastic base 215.

[0019] The insulating housing 10 has a pair of side walls 111 extending in the transverse direction and a pair of end walls 112 extending in the width direction and connecting the pair of side walls 111. The pair of side walls 111 and the pair of end walls 112 surround a receiving cavity 113 extending vertically. The terminal module 20 is installed in the receiving cavity 113 from bottom to top. The contact portion 217 is received in the receiving cavity 113.

[0020] According to the impedance formula

[0021] It can be seen that impedance is related to resistance R, capacitance C and inductance L.

[0022] According to the formula of resistance R

[0023] The cross-sectional area A of the conductor is inversely proportional to the resistance R, and the resistance R is proportional to the impedance Z. The smaller the resistance, the lower the impedance. The thickness and width of the terminal affect the cross-sectional area A in the resistance R formula. When the cross-sectional area changes, the resistance changes, and the impedance Z also changes. Specifically, the thicker and wider the terminal, the smaller the resistance and the smaller the impedance.

[0024] According to the inductance formula

[0025] Where r is the radius of the conductor, and d is the length of the conductor. When the conductor length d is longer, the inductance L will be larger; when the conductor cross-sectional area is smaller, the inductance will be larger. According to the impedance formula, the inductance is proportional to the impedance Z. As the inductance increases, the impedance increases. The thickness and width of the terminal affect the inductance, and then affect the impedance. Specifically, the thicker and wider the terminal, the smaller the inductance and the smaller the impedance.

[0026] According to the capacitance formula

[0027] The dielectric constant of air is 1, and the dielectric constants of other insulating materials are all greater than 1. The dielectric constant of engineering plastics commonly used in connectors is generally between 3 and 4. The larger the dielectric constant, the larger the capacitance and the lower the impedance. According to the impedance formula, the capacitance C is inversely proportional to the impedance Z. The spacing between the terminals is equivalent to the h in the capacitance C formula, which directly affects the capacitance and then the impedance Z. Specifically, the smaller the spacing, the larger the capacitance and the smaller the impedance.

[0028] In summary, when the terminal length remains unchanged, the factors affecting impedance include the terminal thickness, width, spacing between terminals and dielectric constant. Among them, the terminal thickness, width and dielectric constant are inversely proportional to the impedance, and the spacing is proportional to the impedance.

[0029] Each of the conductive terminals 201 includes a signal terminal S and a ground terminal G. In each row of conductive terminals 201, two adjacent signal terminals S form a pair of differential terminals, and the pair of differential terminals and the ground terminal G are arranged alternately in the transverse direction. The signal terminals S and the ground terminal G are formed by integrally stamping and bending a metal plate. The pins 213, the retaining portion 211 and the elastic base 215 of the conductive terminal 201 have the same thickness. The contact portion 217 is docked with the docking terminal (not shown), and the thickness of the contact portion 217 is the thickness of the contact portion 217 plus the thickness of the docking terminal. Therefore, the cross-section of the contact portion 217 is larger, and the impedance of the mating area is lower. The elastic base 215 is exposed to the air, and the dielectric constant of the air is smaller. The impedance of the elastic base 215 is larger, so the elastic base 215 is the impedance high point. There is a more obvious impedance mutation phenomenon at the contact portion 217 and the elastic base 215. It is necessary to increase the impedance of the contact portion 217 and reduce the impedance at the elastic base 215 .

[0030] Specifically, the present invention improves the impedance of the contact portion 217 area by forging the contact portion 217 of the signal terminal S thinner and reducing the width dimension of the contact portion 217 of the signal terminal S. Specifically, the thickness of the metal plate is 0.2 mm. The thickness T of the other parts of the conductive terminal 201 is the same as the thickness of the metal plate, which is 0.2 mm, and the thickness t of the forged thin part is 0.15 mm. The width w of the contact portion 217 of the signal terminal S is 0.16 mm. The forged thin part is arranged on the side surface of the signal terminal S away from the other row of conductive terminals. In order to solve the problem of high impedance of the elastic base 215, the spacing between the elastic bases 215 of a pair of signal terminals S is reduced to reduce the characteristic impedance of the place. Specifically, in the present invention, the spacing W between the elastic bases 215 of the pair of signal terminals S is 0.14. The width dimension of the elastic base 215 of the signal terminal S is greater than the width dimension of other parts. By increasing the size of the elastic base 215 in the lateral direction, the cross-sectional area of ​​the elastic base 215 can be increased, and the characteristic impedance of the elastic base 215 can be balanced to the greatest extent, so that the impedance of the contact portion 217 matches that of the elastic arm portion 215, thereby ensuring smooth signal transmission.

[0031] The above description is only part of the implementation methods of the utility model, not all of the implementation methods. Any equivalent changes made to the technical solution of the utility model by ordinary technicians in this field after reading the specification of the utility model are covered by the claims of the utility model.

Claims

1. An electrical connector, which can be matched with a docking electrical connector, the electrical connector comprising an insulating housing and a terminal module accommodated in the insulating housing, the terminal module comprising a first row of conductive terminals arranged in a transverse direction and an insulator holding the first row of conductive terminals, each of the conductive terminals comprising a holding portion held by the insulator, a pin of the insulator extending downward from one end of the holding portion, an elastic base of the insulator extending from the other end of the holding portion and being elastically deformable, and a contact portion further extended from the elastic base, the first row of conductive terminals comprising a plurality of grounding terminals and a plurality of pairs of signal terminals, each pair of the signal terminals being located between an adjacent pair of grounding terminals, characterized in that: The thickness of the contact portion of the signal terminal is smaller than the thickness of other portions.

2. The electrical connector according to claim 1, wherein: The contacts of the signal terminals are thinned by forging.

3. The electrical connector according to claim 1, wherein: The conductive terminal is formed by stamping and bending a metal plate, and except for the contact portion of the signal terminal, the other portions have the same thickness.

4. The electrical connector according to claim 3, wherein: The thickness of the contact portion of the signal terminal is 0.15 mm, and the thickness of the other portion is 0.2 mm.

5. The electrical connector according to claim 3, wherein: The width dimension of the contact portion of the signal terminal is smaller than the thickness of the metal plate.

6. The electrical connector according to claim 4, wherein: The width of the contact portion of the signal terminal is 0.16 mm.

7. The electrical connector according to claim 3, wherein: A distance between the pair of signal terminals is smaller than a thickness of the metal plate.

8. The electrical connector according to claim 4, wherein: The lateral dimension of the elastic base of the signal terminal is greater than that of other parts.

9. The electrical connector according to claim 4, wherein: The terminal module further includes a second row of conductive terminals opposite to the first row of conductive terminals in a width direction perpendicular to the lateral direction. The thinned portion of the contact portion is disposed on a side surface of the signal terminal away from another row of conductive terminals.

10. The electrical connector according to claim 1, wherein: The insulating shell has a pair of side walls extending transversely and a pair of end walls connecting the pair of side walls. The pair of side walls and the pair of end walls surround a receiving cavity which passes through from top to bottom, and the contact portion is received in the receiving cavity.

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