TWI489699B - Electrical connector - Google Patents

Description

Electrical connector

The present invention relates to an electrical connector, and more particularly to an electrical connector capable of transmitting high speed signals.

The first figure shows an existing electrical connector. As shown in the first figure, the electrical connector includes a plurality of pairs of mutually facing signal terminals 1' and a ground terminal 2'. Each of the signal terminals 1' includes a first contact portion 101', a first fisheye portion 102', and a first connection portion connecting the first contact portion 101' and the first fisheye portion 102'. Each of the ground terminals 2' includes a pair of second contact portions 201' facing each other, a second fisheye portion 202', and a second connecting portion connecting the second contact portion 201' and the second fisheye portion 202'.

As shown in the first figure, each pair of first contact portions 101' extends upward and spreads to both sides, and each pair of first contact portions 101' has a long residual terminal after the contact surface in contact with the electronic card 5'. This will cause the impedance of the signal terminal in the area near the contact surface to be too low, which will affect the signal transmission quality.

As shown in the first figure, the fisheye portion 202' of the ground terminal 2' is not drawn from the symmetrical center line of the ground terminal 2', but is offset to one side, and the second fisheye portion 202' of the ground terminal 2' The first fisheye portion 102' is perpendicular to the signal terminal 1'. This asymmetric structure causes the return path to be unbalanced, which can cause mutual interference between the terminals.

As shown in the first figure, a part of each pair of signal terminals 1' is embedded in the insulating plastic body 3', so that the impedance of the portion of the signal terminal 1' embedded in the plastic body 3' is low, affecting signal transmission. Quality, and will produce a signal delay.

In view of the technical problems such as the local impedance of the signal terminal and the asymmetric structure of the ground terminal existing in the prior art, it is indeed necessary to propose a new electrical connector which can at least effectively alleviate the aforementioned technical problems or can completely eliminate the aforementioned technical problems.

The present invention is directed to at least one aspect of the above problems and deficiencies that exist in the prior art.

Accordingly, the present invention provides an electrical connector capable of effectively improving the quality of signal transmission.

According to an aspect of the invention, an electrical connector is provided for plugging an electronic card, the electrical connector comprising a plurality of signal terminal modules and at least one ground terminal. Each of the signal terminal modules includes: a pair of signal terminals, each of the signal terminals includes a first contact portion facing each other, a first fixing portion, and connecting the first contact portion and the first fixing portion And a first connecting portion; and an insulator molded on the outside of the first connecting portion of the pair of signal terminals to form a module integrated with the pair of signal terminals. Each of the ground terminals includes a pair of second contacts, a second fixing portion, and a second connecting portion connecting the second contact portion and the second fixing portion. Wherein a window corresponding to each of the signal terminals is formed on the insulator for exposing a portion of each of the signal terminals corresponding to the window to the air.

According to an embodiment of the invention, the window is formed on a front side surface and a rear side surface of the insulator.

According to another embodiment of the present invention, the plurality of signal terminal modules are arranged one behind the other, and in any two adjacent signal terminal modules, the window on the rear side surface of the insulator of the previous signal terminal module The positions of the windows on the front side surface of the insulator of the latter signal terminal module are shifted from each other.

According to another embodiment of the present invention, each of the first contacts is in the shape of a hook, and a contact surface of the first contact portion in contact with the electronic card is located at the top of the arc of the hook, and is close to the The end point of the first contact portion is described.

According to another embodiment of the present invention, the width of the signal terminal is tapered from the first fixing portion to the first contact portion.

According to another embodiment of the present invention, each of the ground terminals has a symmetrical structure, and the pair of second contacts of each of the ground terminals are symmetrically located on both sides of a symmetrical center line of the ground terminal, and The second fixing portion is located on a symmetrical center line of the ground terminal.

According to another embodiment of the present invention, the second fixing portion of each of the ground terminals and the first fixing portion of each of the signal terminals are parallel to each other.

According to another embodiment of the present invention, the electrical connector further includes an insulative housing, the fixing portion of the signal terminal and the grounding terminal projecting from the bottom of the insulative housing, and the other portion is received in the insulative housing; The top of the insulative housing has an insertion slot through which the electronic card is inserted to make electrical contact with the contact portion of the signal terminal and the ground terminal.

In the above various embodiments of the present invention, since a window corresponding to each signal terminal is formed on the insulator, the portion of each signal terminal corresponding to the window is exposed to the air, thereby effectively improving each signal. The impedance of the portion of the terminal embedded in the insulator, thereby increasing the signal transmission rate and effectively reducing the signal transmission delay.

The technical solution of the present invention will be further specifically described below by way of embodiments and with reference to the accompanying drawings. In the description, the same or similar reference numerals indicate the same or similar components. The description of the embodiments of the present invention is intended to be illustrative of the present invention, and is not to be construed as limiting.

The seventh figure shows a schematic structural view of an electrical connector in accordance with an exemplary embodiment of the present invention. Although not shown in the seventh figure, as shown in the seventh figure, the electrical connector includes a plurality of signal terminal modules and at least one ground terminal. Hereinafter, the structure of each signal terminal module and the ground terminal will be described in detail based on the second to fourth figures.

The second figure shows a schematic structural view of a front side surface of a signal terminal module in accordance with an exemplary embodiment of the present invention. As shown in the second figure, each of the signal terminal modules includes a pair of mutually facing signal terminals 1, 1 and a plastic insulator 3 molded on the pair of signal terminals 1, 1 by overmolding. As shown in the second figure, the insulator 3 is molded outside the first connection portion of the pair of signal terminals 1, 1 to form a module in which the pair of signal terminals 1, 1 are integrated.

Referring to the second figure, each of the signal terminals 1 includes a first contact portion 101, a first fixing portion 102, and a first connecting portion connecting the first contact portion 101 and the first fixing portion 102. In a specific embodiment shown in the second figure, the first fixing portion is formed as a first fixing portion in the form of a fisheye (hereinafter referred to as a first fisheye portion 102), but the present invention is not limited thereto, and the first The fixing portion may also be in the form of surface adhesion technology (SMT) or perforated welding (T/H), or other fixed form.

As shown in the second figure, in the overmolding process, a window 301 corresponding to each signal terminal 1 is formed on the front side surface of the insulator 3, so that the portion of each signal terminal 1 corresponding to the window 301 is exposed. Into the air.

In the embodiment shown in the second figure, on the front side surface of the insulator 3, there are three windows 301 corresponding to one signal terminal 1 on the outer side, and two windows 301 corresponding to the inner signal terminal 1 are two. Note that the present invention is not limited thereto, and the number, size, and the like of the windows can be changed as needed.

The third figure shows a schematic structural view of the rear side surface of the signal terminal module shown in the second figure. As shown in the third figure, a window 301 corresponding to each of the signal terminals 1 is also formed on the rear side surface of the insulator 3, so that the portion of each of the signal terminals 1 corresponding to the window 301 is exposed to the air.

In the embodiment shown in the third figure, on the rear side surface of the insulator 3, there are two windows 301 corresponding to one signal terminal 1 on the outer side, and three windows 301 corresponding to the inner signal terminal 1 are three. Note that the present invention is not limited thereto, and the number, size, and the like of the windows can be changed as needed.

In the exemplary embodiments shown in the second and third figures, the window 301 on the front side surface and the window 301 on the rear side surface are offset from each other. Therefore, when the two signal terminal modules are arranged side by side, the window 301 on the rear side surface of the insulator 3 of the previous signal terminal module and the window 301 on the front side surface of the insulator 3 of the latter signal terminal module are just right. They are staggered from each other and do not face each other and communicate with each other. This is to effectively avoid mutual interference between the signal terminals of the previous signal terminal module and the signal terminals of the latter signal terminal module.

In the above embodiment shown in the second to third figures, since a plurality of windows 301 are formed on the plastic insulator 3, the portion of each of the signal terminals 1 embedded in the insulator 3 can be well improved. The impedance can reduce the signal reflection caused by the impedance discontinuity, and can improve the propagation speed of the signal terminal in the window area and reduce the signal delay.

The theoretical basis for forming the window 301 to control the impedance Z on the plastic insulator 3 is as follows:

Z=(L/C) ^1/2

Where L is the inductance value of the terminal and C is the capacitance value of the terminal. Opening an air window next to the terminal reduces C, so the impedance can be increased.

The theoretical basis for forming the window 301 on the plastic insulator 3 to reduce the signal delay (Propagation Delay) is as follows:

Propagation Delay=L sqrt(ε)/C

Where L is the length of the signal terminal, ε is the dielectric constant of the dielectric, and C is the speed of light. Opening an air window next to the terminal can effectively lower the dielectric constant ε, thus effectively reducing the signal delay.

The fourth figure shows a schematic structural view of a ground terminal according to an exemplary embodiment of the present invention.

As shown in the fourth figure, each of the ground terminals 2 includes a pair of second contact portions 201 facing each other, a second fixing portion 202, and a second connecting portion connecting the second contact portion 201 and the second fixing portion 202. In a specific embodiment shown in the fourth figure, the second fixing portion is formed as a second fixing portion in the form of a fisheye (hereinafter referred to as a second fisheye portion 202), but the present invention is not limited thereto, and the second The fixing portion may also be in the form of SMT or T/H, or any other existing fixed form.

Returning to the second and third figures, the first contact portion 101 of each signal terminal 1 is in the shape of a hook, and each hook-shaped first contact portion 101 is in contact with the electronic card 5 (see the seventh figure). The contact surface is close to the end point of the first contact portion 101 such that there is substantially no residual terminal after the contact surface.

Returning to the fourth figure, as shown in the fourth figure, the second contact portion 201 of each ground terminal is also in the shape of a hook, and the contact surface of each hook-shaped second contact portion 201 in contact with the electronic card 5 The end point of the second contact portion 201 is approached so that there is substantially no residual terminal after the contact surface.

Compared with the prior art shown in the first figure, since the signal terminal 1 according to an embodiment of the present invention has substantially no terminal residual after the contact surface in contact with the electronic card, the impedance value of the contact surface area of the terminal can be effectively controlled, and the impedance is reduced. Reflection due to discontinuity in impedance. The theoretical basis is as follows:

Z=sqrt(L/C)

Where L is the inductance value of the terminal and C is the capacitance value of the terminal. Shortening the terminal residual also reduces C, thereby increasing the impedance value Z.

Referring to the second and third figures, the width of each signal terminal 1 is tapered from the first fisheye portion 102 to the first contact portion 101. This is because the influence of the electronic card 5 (see the seventh figure), the closer the signal terminal 1 is to the portion of the electronic card 5 (see the seventh figure), the more the impedance is reduced, and therefore, each signal terminal 1 is kept away from each other. The portion of the electronic card 5 (the first fisheye portion 102) is tapered toward the portion (the first contact portion 101) close to the electronic card 5 in order to gradually change the impedance of each portion of the signal terminal to ensure the respective components of the signal terminal. Consistent continuity of partial impedance.

As shown in the fourth figure, each of the ground terminals 2 has a symmetrical structure, and a pair of second contact portions 201 of each of the ground terminals 2 are symmetrically located on both sides of the symmetrical center line of the ground terminal 2, and a second fisheye The portion 202 is located on the symmetrical center line of the ground terminal 2, that is, the second fisheye portion 202 is taken out from the middle of the ground terminal 2.

In the embodiment shown in the fourth figure, since the ground terminal 2 has a completely symmetrical structure, it is possible to provide a more balanced return path for the two rows of signal terminals than the prior art shown in the first figure, thereby further Good suppression of noise between signal terminals.

The fifth figure shows a schematic diagram of two signal terminal modules and one ground terminal arranged side by side; the sixth figure shows a schematic view when viewed from the back of the fifth figure.

As shown in the fifth and sixth figures, the second fisheye portion 202 of each ground terminal 2 and the first fisheye portion 102 of each signal terminal 1 are parallel to each other.

The seventh figure shows a schematic structural view of an electrical connector in accordance with an exemplary embodiment of the present invention.

As shown in the seventh figure, the electrical connector further includes an insulative housing 4 for housing a plurality of signal terminal modules and a ground terminal. As shown in the fifth and sixth figures, the plurality of signal terminal modules and the protrusions 302 on the ground terminals are snapped into the slots 402 of the insulative housing 4, thereby securing the plurality of signal terminal modules and the ground terminals. The ground is mounted in the insulative housing 4.

As shown in the seventh figure, when a plurality of signal terminal modules and ground terminals are mounted in the insulative housing 4, the fisheye portions 102, 202 of the signal terminal 1 and the ground terminal 2 protrude from the bottom of the insulative housing 4, and other portions. It is housed in the insulating housing 4. Further, the top of the insulative housing 4 has an insertion slot through which the electronic card 5 is inserted to make electrical contact with the contact portions 101, 201 of the signal terminal 1 and the ground terminal 2.

The invention has been described in connection with the preferred embodiments of the invention, and is not intended to be construed as limiting.

While some embodiments of the present general inventive concept have been shown and described, it will be understood by those of ordinary skill in the art The scope is defined by the scope of the patent application and their equivalents. It should be noted that the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude the plural. In addition, any element numbering of the patent application should not be construed as limiting the scope of the invention.

1'. . . Signal terminal

101’. . . First contact

102’. . . First fish eye

2'. . . Ground terminal

201’. . . Second contact

202’. . . Second fish eye

3’. . . Plastic body

5’. . . Electronic card

1. . . Signal terminal

101. . . First contact

102. . . First fixed part

2. . . Ground terminal

201. . . Second contact

202. . . Second fixed part

3. . . Insulator

301. . . window

302. . . Bulge

4. . . Insulated housing

5. . . Electronic card

The first figure shows a schematic diagram of an existing electrical connector.

The second figure shows a schematic structural view of a front side surface of a signal terminal module in accordance with an exemplary embodiment of the present invention.

The third figure shows a schematic structural view of the rear side surface of the signal terminal module shown in the second figure.

The fourth figure shows a schematic structural view of a ground terminal according to an exemplary embodiment of the present invention.

The fifth figure shows a schematic diagram of two signal terminal modules and one ground terminal arranged side by side.

The sixth figure shows a schematic view when viewed from the back of the fifth figure.

The seventh figure shows a schematic structural view of an electrical connector in accordance with an exemplary embodiment of the present invention.

1. . . Signal terminal

101. . . First contact

102. . . First fixed part

2. . . Ground terminal

201. . . Second contact

202. . . Second fixed part

3. . . Insulator

302. . . Bulge

Claims (8)

An electrical connector for plugging in an electronic card, the electrical connector comprising: a plurality of signal terminal modules, wherein each of the signal terminal modules comprises: a pair of signal terminals, each of the signal terminals including a mutual face a first contact portion, a first fixing portion, and a first connecting portion connecting the first contact portion and the first fixing portion; and an insulator molded on the first of the pair of signal terminals a pair of signal terminals forming an integrated module and at least one grounding terminal, wherein each of the grounding terminals includes a pair of second contact portions, a second fixing portion, and a connection portion a second connecting portion of the second contact portion and the second fixing portion, wherein a window corresponding to each of the signal terminals is formed on the insulator for making each of the signal terminals The corresponding portion of the window is exposed to the air. The electrical connector of claim 1, wherein the window is formed on a front side surface and a rear side surface of the insulator. The electrical connector of claim 2, wherein the plurality of signal terminal modules are arranged one behind the other, and in any two adjacent signal terminal modules, the insulator of the previous signal terminal module The window on the side surface is offset from the window position on the front side surface of the insulator of the latter signal terminal module. The electrical connector of claim 1, wherein each of the first contacts is in the shape of a hook, and a contact surface of the first contact portion in contact with the electronic card is located at the hook The top of the arc is near the end point of the first contact. The electrical connector of claim 1, wherein the width of the signal terminal is tapered from the first fixing portion to the first contact portion. The electrical connector of claim 1, wherein each of the ground terminals has a symmetrical structure, and the pair of second contacts of each of the ground terminals are symmetrically located at a symmetrical center line of the ground terminal Both sides, and the second fixing portion is located on a symmetrical center line of the ground terminal. The electrical connector of claim 6, wherein the second fixing portion of each of the ground terminals and the first fixing portion of each of the signal terminals are parallel to each other. The electrical connector of claim 7, further comprising an insulative housing, the fisheye portion of the signal terminal and the grounding terminal projecting from a bottom of the insulative housing, and other portions are received in the insulative housing And the top of the insulative housing has an insertion slot through which the electronic card is inserted to make electrical contact with the contact portion of the signal terminal and the ground terminal.