In view of the above-mentioned prior art, the inventor of the present invention has not added a perfect part, and therefore, the present invention adds the application of the electrical shielding concept in the existing grounding design, so that the present invention has further improvement in the efficiency of preventing noise interference.
A second object of the present invention is to provide an electrical connector capable of reducing the insertion force of the circuit board and simultaneously maintaining the same positive clamping force between each pair of terminals and the circuit board.
According to the first feature of the present invention, there is provided a slot connector with enhanced shielding effect for inserting a circuit board, wherein the slot connector comprises a long insulating housing, a central slot is provided along the longitudinal direction of the slot connector, and a plurality of terminal accommodating grooves are provided in rows on both sides of the slot connector, wherein each row of the terminal accommodating grooves is formed in a manner that the signal terminal accommodating grooves and the ground terminal accommodating grooves are disposed in a staggered manner, and each signal terminal and ground terminal forms a corresponding relationship with the other row of the signal terminals and ground terminals. The slot connector further comprises a plurality of signal terminals, each signal terminal is respectively accommodated in each signal terminal accommodating groove, and each signal terminal comprises a contact part, an elastic arm part, a fixing part and a pin part. The slot connector further includes a plurality of ground terminals individually received in each of the ground terminal receiving grooves, and each of the ground terminals further includes a contact portion, an elastic arm portion, a fixing portion and a pin portion. At least one of the contact portion, the elastic arm portion and the fixing portion of each ground terminal has a profile dimension slightly larger than that of a corresponding portion of each signal terminal.
According to a second feature of the present invention, there is provided a slot connector capable of reducing the insertion force of a circuit board, comprising a long insulating housing, a central slot being formed along the longitudinal direction of the housing, and a plurality of terminal receiving grooves being formed in rows on both sides of the housing, wherein the plurality of terminal receiving grooves are formed in a manner such that the signal terminal receiving grooves and the ground terminal receiving grooves are disposed alternately, and each signal terminal and ground terminal forms a corresponding relationship with the signal terminal and the ground terminal of another row. The slot connector further comprises a plurality of signal terminals, which are respectively accommodated in each signal terminal accommodating groove, and each signal terminal comprises a contact part, an elastic arm part, a fixing part and a pin part. The socket connector further includes a plurality of ground terminals individually received in each of the ground terminal receiving grooves, and each of the ground terminals further includes a contact portion, an elastic arm portion, a fixing portion and a pin portion. The contact point position of the ground terminal with the circuit substrate is higher than that of the signal terminal with the circuit substrate, and when the circuit substrate is not inserted yet, the gap between the contact points of each pair of ground terminals with the circuit substrate is narrower than that between the contact points of each pair of signal terminals with the circuit board.
Utilize the utility model discloses a slot connector not only can strengthen the shielding effect to further improve the efficiency that prevents noise interference, and can reduce circuit substrate insertion force, can keep simultaneously to each pair to have roughly the same forward clamping-force between terminal and the circuit substrate.
Other objects, features and advantages of the present invention will be more fully understood from the following detailed description of the preferred embodiments taken in conjunction with the accompanying drawings.
The present invention will be described in detail with reference to the following embodiments and accompanying drawings, and it should be noted that the examples shown in the drawings are only for illustrative purposes and are not intended to limit the present invention.
Referring to fig. 1, the electrical connector of the present invention includes a long insulating housing 10, and a central slot 20 is disposed in the longitudinal direction of the insulating housing 10, wherein the central slot 20 is used for receiving a board edge of a circuit board 100. In addition, a row of terminal receiving grooves is formed on each of the two longitudinal sides of the insulative housing 10, and each row of terminal receiving grooves is formed in such a manner that the signal terminal receiving grooves 12 and the ground terminal receiving grooves 14 are alternately arranged, and corresponds to the other row of terminal receiving grooves in a one-to-one correspondence. As can be clearly seen from the drawings, the size of the signal terminal accommodating groove 12 and the size of the ground terminal accommodating groove 14 of the electrical connector of the present invention are slightly different, because the size of the signal terminal of the present invention is slightly smaller than the size of the ground terminal, which will be explained in more detail below.
Referring to fig. 2A and fig. 2B, three-dimensional views of the signal terminal 30 and the ground terminal 40 of the present invention are respectively shown. As can be seen from the figure, each signal terminal 30 includes a contact portion 31, a resilient arm portion 32, a fixing portion 33 and a pin portion 34. The contact portion 31 includes a portion where the uppermost edge of the signal terminal 30 extends downward to approximately the contact point P contacting the circuit substrate 100, and the elastic arm portion 32 extends downward from the contact point P to approximately the fixing portion 33, wherein the elastic arm portion 32 is configured to provide elastic deformation when the circuit substrate 100 is inserted into the central slot 20, so as to provide a sufficient positive force of the contact portion 31 to form a stable and reliable contact with the board edge of the circuit substrate 100. The fixing portion 33 is used to firmly fix the signal terminal 30 in the signal terminal receiving slot 12, which is achieved by the interference fit between the fixing flanges 331 protruding upwards from two sides of the fixing portion 33 and the inner walls of the corresponding slots of the signal terminal receiving slot 12. In addition, a barb 332 is protruded from the outer side of each of the locking flanges 331 in a direction facing the inner wall of the signal terminal receiving groove 12, and the barb 332 is used for piercing the inner wall of the signal terminal receiving groove 12 when the signal terminal 30 is mounted in the signal terminal receiving groove 12, so as to prevent the signal terminal 30 from falling out of the signal terminal receiving groove 12. A pin 34 extends downward from the fixing portion 33 and is inserted into a corresponding through hole on the main circuit board (not shown) to be electrically connected to the circuit on the main circuit board.
Each ground terminal 40 further includes a contact portion 41, a resilient arm portion 42, a fixing portion 43 and a pin portion 44, wherein the fixing portion 43 further includes a locking flange 431 and a barb 432. Since the structure of the ground terminal 40 is substantially the same as that of the signal terminal 30, the structure and function of each component will not be described in detail.
As clearly shown in fig. 2A and 2B, the lateral width of the contact portion 41 of the ground terminal 40 is greater than the lateral width of the contact portion 31 of the signal terminal 30, and the overall lateral width of the fixing portion of the ground terminal 40 is also greater than the lateral width of the fixing portion 31 of the signal terminal 30, so that when the signal terminal 30 adjacent to the two ground terminals 40 transmits a high-frequency signal, the enlarged portions of the two ground terminals 40 respectively located in front of and behind the signal terminal 30 can provide a shielding effect, and thus the noise interference of the signal terminal 30 during signal transmission can be greatly reduced. It should be noted that the spirit of the present invention is to design some specific parts of the ground terminal to be slightly larger than the corresponding parts of the signal terminal, and the position and number of the specific parts are determined by the shape of the terminal, the application occasion and the assembling difficulty. Although the present embodiment is illustrated with the contact portion 41 and the fixing portion 43 of the ground terminal 40 being enlarged, the present invention is not limited thereto. In addition, as mentioned above, the ground terminal receiving groove 14 of the present invention is designed to be slightly larger than the signal terminal receiving groove 12, which not only considers that the size of some specific parts of the ground terminal 40 is slightly larger than the size of the signal terminal 30, but also provides the advantage of making the assembling personnel easily distinguish to avoid assembling errors. In addition, the size of the receiving groove 14 of the ground terminal is designed to be slightly larger, so that the flexibility of the design of the ground terminal for providing the shielding effect can be increased, and the shielding effect of the ground terminal is prevented from being damaged due to the fact that the size of the receiving groove 14 of the ground terminal is changed.
As described above, in the process of increasing the density of the electrical connector, in addition to the problem of the above-mentioned undesired interference, the problem of a large increase in the insertion force when the circuit board 100 is inserted into the central slot 20 due to the increase in the number of terminals is considered. In view of this problem, the present invention also provides a solution with considerable advantages.
Referring to fig. 3, 4 and 5, fig. 3 and 4 respectively show cross-sectional views of the signal terminal and the ground terminal of the present invention located in the terminal accommodating groove, and fig. 5 is a schematic cross-sectional view of the signal terminal and the ground terminal overlapped together. Referring to the drawings, if the vertical distance between the contact point P of the contact portion 31 of the signal terminal 30 and the bending point B of the elastic arm portion 32 is set to L, and the vertical distance between the contact point P of the contact portion 41 of the ground terminal 40 and the bending point B of the elastic arm portion 32 is set to L ', as can be clearly seen from fig. 3 and 4, the distance L' is greater than the distance L, that is, when the circuit board 100 is inserted into the central slot 20, the two sides of the board edge first make clamping contact with all the ground terminals of the electrical connector, and then, as the circuit board 100 is further inserted, it makes clamping contact with all the signal terminals of the electrical connector. Through the design, the circuit substrate is inserted in a two-section type stress mode, so that the stress of the circuit substrate during insertion can be reduced, and the situation that the circuit substrate is difficult to insert due to overlarge insertion force during one-time stress insertion is avoided.
However, it should be understood by those skilled in the art that the above-mentioned high-low contact design results in different stresses between different ends (due to different arm lengths L and L' of the deformation moment). In other words, if the stress between the terminals is different, after the circuit board is inserted and pulled for several times, the elastic fatigue degree between the terminals is different, which is very likely to cause some terminals to have poor contact. In order to solve the problem, the present invention proposes to achieve the effect of substantially the same forward clamping force between the different terminals to the board edge of the circuit board by controlling the displacement between the different terminals. In detail, referring to fig. 3 and 4 again, if the horizontal distance between the contact points P of the pair of signal terminals is set as G, and the horizontal distance between the contact points P of the pair of ground terminals is set as G ', it is obvious that the gap G between the pair of signal terminal contact points P of the present invention is larger than the gap G' between the pair of ground terminal contact points P, so that when the circuit substrate is inserted into the central slot of the electrical connector, the positive clamping forces of the signal terminals and the ground terminals to the plate edges can be substantially the same.
Referring to fig. 5, the ground terminal is shown by a solid line, and the signal terminal is shown by a dashed line, as can be seen from the figure, the contact portion 41 and the fixing portion 43 of the ground terminal 40 of the present invention can indeed shield the corresponding portion of the signal terminal 30 (i.e., the contact portion 31 and the fixing portion 33) in the assembled state, so as to achieve the effect of reducing noise interference. Furthermore, because the utility model discloses a ground terminal and signal terminal adopt the design mode of high low level contact, and in addition with the design that changes the contact point clearance between the different terminals in pairs, make the utility model discloses an electric connector not only can reduce circuit substrate's insertion force, and can also make signal terminal and ground terminal keep roughly the same forward clamping-force.
Although the present invention has been described in detail, those skilled in the art can make changes and modifications to the detailed structure of the invention without departing from the spirit and scope of the invention after reading the above description. However, various modifications and changes to the embodiments of the present invention are also intended to be included within the scope of the claims of the present invention.