High-power conductive terminal and card edge connector comprising same

Abstract

The utility model relates to the technical field of electric connectors, in particular to a high-power conductive terminal and a card edge connector comprising the same. The conductive terminal is provided with an outer side position conductive sheet and an inner side position conductive sheet; the outer side position conducting strip is provided with a base body part I, a contact arm I and an L-shaped bent pin part I, and the contact arm I is provided with a contact part I with a bent structure; the inner side position conducting strip is provided with a base body part II, a contact arm II and an L-shaped bent pin part II; the contact arm II is provided with a contact part II with a bent structure; the first contact arm of the outer side position conducting strip and the second contact arm of the inner side position conducting strip are arranged on the same side of the plug-in direction of the plug-in circuit board, and in the plug-in process of the plug-in circuit board from outside to inside, the first contact part makes contact with the plug-in circuit board before the second contact part. The first pin part and the second pin part are matched in a spaced and layered mode. The card edge connector provided by the utility model has the advantages of small volume, large current-carrying capacity and low cost.

Description

Technical Field

[0001] This utility model relates to the field of electrical connector technology, specifically a high-power conductive terminal and a snap-edge connector including the terminal. Background Technology

[0002] Edge connectors are typically used to connect circuit boards with gold fingers (i.e., PCB boards that mate with edge connectors; to distinguish them from PCB boards that are fixedly connected to edge connectors, circuit boards that mate with edge connectors are collectively referred to as "intercalation circuit boards") to the motherboard (i.e., PCB boards that are fixedly connected to edge connectors). They are widely used in the field of server power supplies.

[0003] With the technological advancements in server power supplies, card edge connectors have been required to achieve small size and high current carrying capacity. To meet this requirement, the industry has designed high-power conductive terminals that are staggered on the same side of the circuit board insertion direction, forming two contact points. This doubles the cross-sectional area and contact points while maintaining the same horizontal width of the conductive terminals, reducing contact resistance and effectively enhancing the current carrying capacity of the conductive terminals. Examples include Chinese patent documents titled "Electrical Connector" (Publication No. CN 205376841 U, Publication Date July 6, 2016) and "Hybrid Card Edge Connector and Power Terminal for High-Power Applications" (Publication No. CN113646972 A, Publication Date November 12, 2021).

[0004] However, regarding the technology disclosed in CN 205376841 U, the inner and outer conductive sheets that make up the conductive terminal are all stacked together from the base to the pin area. That is, except for the contact arm which is a forked fit, the rest are all stacked together. While this technical feature is advantageous for assembling the conductive terminal within an insulating housing, it is disadvantageous for increasing the number of solder pads on the PCB board. In other words, the number of solder pads on the PCB board that mate with the conductive terminal is small, resulting in fewer wiring layers and thus a relatively low current carrying capacity of the PCB board. This limits the current carrying capacity of the conductive terminal.

[0005] Regarding the technology disclosed in CN 113646972 A, the contact arms and pins of the conductive plates constituting the conductive terminals are generally arranged in a straight line. Furthermore, the conductive terminals have a three-dimensional structure to fit into the circuit board. This results in a complex three-dimensional structure within the straight-line arrangement, leading to two main challenges: firstly, it complicates the design of the molding die, increases the difficulty of molding technology, and raises the manufacturing cost of the die, directly impacting the difficulty in controlling the manufacturing cost of the conductive terminals; secondly, it makes it difficult to maintain stable control over the molding dimensions of the conductive terminals. Additionally, the straight-line arrangement of the conductive terminals results in a large structural size for the insulating shell constituting the edge connector, which is not only detrimental to cost control but also hinders the miniaturization of the molded edge connector structure. Utility Model Content

[0006] The technical objective of this utility model is to provide a high-power conductive terminal with good current carrying capacity and which is conducive to miniaturizing the structure of the formed edge connector, in view of the special characteristics of the above-mentioned edge connector and the shortcomings of the prior art, and an edge connector including the terminal.

[0007] The technical objective of this utility model is achieved through the following technical solution: a high-power conductive terminal having an outer conductive sheet and an inner conductive sheet;

[0008] The outer conductive sheet has a base portion 1, a contact arm 1 extending from the front side of the base portion 1, and a pin portion 1 extending from the rear side of the base portion 1 and bent to cooperate with the base portion 1 in an L-shaped structure. The contact arm 1 has a bent contact portion 1 on the side that is connected to the plug-in circuit board.

[0009] The inner conductive sheet has a base portion two, a contact arm two extending from the front side of the base portion two, and a pin portion two extending from the rear side of the base portion two and bent to cooperate with the base portion two in an L-shaped structure. The contact arm two has a bent contact portion two on the side that cooperates with the plug-in circuit board.

[0010] The contact arm one of the outer conductive sheet and the contact arm two of the inner conductive sheet are arranged on the same side of the insertion direction of the plug-in circuit board. During the insertion process of the plug-in circuit board from the outside to the inside, the contact portion one of the outer conductive sheet contacts the plug-in circuit board before the contact portion two of the inner conductive sheet. The pin portion one of the outer conductive sheet and the pin portion two of the inner conductive sheet are layered and matched with a spacing.

[0011] The aforementioned technical measures, addressing the unique characteristics of the edge connector, incorporate an L-shaped bending structure for the inner and outer conductive sheets forming the conductive terminals, with the pins of the inner and outer conductive sheets arranged in a layered configuration. The conductive terminals, formed by the inner and outer conductive sheets and arranged on the same side of the insertion direction of the circuit board, double the cross-sectional area and contact points while maintaining the same width, reducing contact resistance and significantly increasing current carrying capacity. Furthermore, the inner and outer conductive sheets form multiple contact arms on the same side of the insertion direction of the circuit board. Compared to the traditional single-piece structure, this allows for a more stable insertion and removal design of the circuit board, ensuring stable conductivity and improving the lifespan of both the circuit board and the edge connector. The layered spacing of the inner and outer conductive plates of the conductive terminals, with their pins spaced in layers, significantly increases the number of solder pads at the PCB board, effectively increasing the number of wiring layers on the PCB—that is, increasing the copper layers. This improves the current-carrying capacity of the PCB board, thus reducing constraints on the current-carrying performance of the conductive terminals and enabling them to achieve high power density current-carrying capacity. The L-shaped bending structure of the conductive terminals significantly reduces their length in the direction of insertion into the circuit board, thereby effectively reducing the longitudinal dimension of the formed edge connector in the direction of gold finger insertion, which is beneficial for miniaturizing the overall structure of the edge connector. Therefore, the above technical measures are conducive to obtaining a small-volume, high-current-carrying edge connector.

[0012] As one of the preferred technical solutions, the contact arm of the outer conductive sheet is a plurality of contacts arranged at intervals in the horizontal direction on the front side of the base portion.

[0013] The second contact arm of the inner conductive sheet is a plurality of the two contacts arranged at intervals in the horizontal direction on the front side of the second base portion.

[0014] Furthermore, each contact arm 2 of the inner conductive sheet and each contact arm 1 of the outer conductive sheet form an inner-outer one-to-one correspondence in their relative arrangement positions.

[0015] The aforementioned technical measures enable the contact arms on the conductive sheet to be formed in a finger-like structure. On the one hand, under the same horizontal width, this helps to reduce the number of conductive sheets, thereby facilitating processing and assembly. On the other hand, it allows multiple contact arms to be formed on the same conductive sheet in the horizontal width direction, which, while ensuring the stability of the insertion, facilitates a smooth insertion and removal design for the conductive sheet. On the other hand, the resulting conductive terminal has good overall integrity and a larger horizontal width structure, which helps to improve current carrying capacity.

[0016] As one of the preferred technical solutions, the contact portion one of the outer conductive sheet is formed at the front end of the contact arm one with a V-shaped bending structure.

[0017] The second contact portion of the inner conductive sheet is formed at the front end of the second contact arm with a V-shaped bending structure.

[0018] Furthermore, the front end of the contact arm of the inner conductive sheet and the contact portion of the outer conductive sheet are arranged at a distance in the insertion direction of the plug-in circuit board.

[0019] Furthermore, the V-shaped bending structure has a smooth, rounded corner at the bending apex.

[0020] Furthermore, the angle between the front fold of the V-shaped bending structure and the horizontal plane where the plug-in circuit board is inserted is 25 to 70°.

[0021] The contact portion of the above-mentioned technical measures is easy to bend and shape while ensuring a smooth and gentle insertion contact with the plug-in circuit board. This is especially evident compared to the contact portion of the bend structure in the prior art.

[0022] As one of the preferred technical solutions, the base portion one of the outer conductive sheet and the base portion two of the inner conductive sheet are overlapped together in the thickness direction. This technical measure, while meeting the requirements of high current carrying capacity, facilitates convenient, stable, and precise assembly operations within the insulating housing.

[0023] Furthermore, the overlapping portion of the outer conductive sheet and the inner conductive sheet is fixed by ultrasonic welding. This technical measure, through ultrasonic welding, enables the inner and outer conductive sheets constituting the conductive terminal to form a good fixed integral with good rigidity. This effectively enhances the fixing force applied by the plastic during assembly within the insulating shell; secondly, it helps to enhance the fixing force when the conductive terminal pins are soldered to the PCB board; thirdly, it provides good vibration resistance, including meeting vibration and impact tests, and resisting impact vibration during subsequent product service; fourthly, it allows the inner and outer conductive sheets to form a parallel arrangement in the electrical structure, with contact resistance approaching similar levels, essentially forming current-sharing characteristics, small voltage difference (approximately zero), and good voltage withstand performance. As one preferred technical solution, the base portion of the outer conductive sheet has outwardly convex insertion teeth on both sides in the horizontal direction. When the outer conductive sheet is assembled within the insulating shell, it is interference-fitted into the corresponding through holes through the insertion teeth on both sides of the base portion. This technical measure allows the outer conductive sheet constituting the conductive terminal to be inserted and fixed in the insulating shell with an interference fit structure. On the one hand, it is beneficial for the conductive terminal to be inserted stably and accurately in the insulating shell. On the other hand, compared with the existing technology that forms an assembly block on the conductive terminal, it is beneficial for the conductive terminal to be easily and simply formed, and it is also beneficial for reducing the manufacturing cost of the conductive terminal and the formed edge connector.

[0024] Furthermore, the insert protrusions on each side of the base portion are arranged in a plurality of spaced-apart configurations in the front-back direction.

[0025] Furthermore, the leading edge of the foremost insert protrusion is a straight edge structure, and the outer protrusion apex is located in the rear region; when the outer conductive sheet is inserted into the insulating shell, the foremost insert protrusion abuts against the limiting stop of the corresponding insertion hole through the straight edge structure of the leading edge, and is interference-fitted with the hole wall of the corresponding insertion hole through the outer protrusion apex of the rear region, and is clearance-fitted with the hole wall of the corresponding insertion hole in the front region.

[0026] The convex height of the outer apex of the remaining insert teeth in the horizontal direction is greater than that of the outer convex apex of the foremost insert tooth;

[0027] Correspondingly, the outer conductive sheet is assembled in the corresponding insertion hole of the insulating shell in a back-to-forward insertion direction, and the concave space between adjacent insertion protrusions on the same side of the base portion forms a waste collection groove.

[0028] The above-mentioned technical measures are based on the special nature of the interference fit of the conductive sheet constituting the conductive terminal within the insulating shell. On the one hand, they can ensure the precise and stable insertion of the conductive sheet within the insulating shell; on the other hand, they enable the rear inserting tooth, which inserts along the insertion trajectory of the front inserting tooth, to achieve an interference fixing force that is basically consistent with the front inserting tooth, thus ensuring the stability of the conductive sheet insertion within the insulating shell; and thirdly, the plastic waste generated by the front inserting tooth during the interference fit is concentrated in the concave space between adjacent inserting teeth during relative displacement, thereby reducing the random diffusion of plastic waste and its interference with the conductivity of the conductive terminal. This is especially evident when the straight edge of the foremost inserting tooth abuts against the stop.

[0029] Furthermore, each insertion protrusion on each side of the base portion is an oblique tooth structure that transitions outward from front to back, with a guide slope at the front of the apex of the protrusion. This technical measure not only achieves a stable interference fit effect, but also, under the guidance of the slope, allows the conductive sheet to be smoothly inserted from back to front within the insulating shell. It also increases the backward resistance of the conductive sheet within the insulating shell, thereby ensuring stable insertion of the conductive sheet within the insulating shell.

[0030] As one of the preferred technical solutions, the second base portion of the inner conductive sheet has outwardly protruding insertion teeth on both sides in the horizontal direction. When the inner conductive sheet is assembled in the insulating shell, it is interference-fitted into the corresponding through holes through the insertion teeth on both sides of the second base portion. This technical measure enables the outer conductive sheet constituting the conductive terminal to be fixed in the insulating shell with an interference fit structure. On the one hand, it is beneficial to the stable and accurate installation of the conductive terminal in the insulating shell; on the other hand, compared with the existing structure of forming an assembly block on the conductive terminal, it is beneficial to the easy and simple molding of the conductive terminal and the manufacturing cost of the conductive terminal and the molded edge connector.

[0031] Furthermore, the insertion protrusions on each side of the second base portion are arranged in a plurality of spaced-out patterns in the front-back direction;

[0032] Furthermore, the leading edge of the foremost insert protrusion is a straight edge structure, and the outer convex vertex is located in the rear region; when the inner conductive sheet is inserted into the insulating shell, the foremost insert protrusion abuts against the limiting stop of the corresponding insertion hole through the straight edge structure of the leading edge, and is interference-fitted with the hole wall of the corresponding insertion hole through the outer convex vertex of the rear region, and is clearance-fitted with the hole wall of the corresponding insertion hole in the front region.

[0033] The convex height of the outer apex of the remaining insert teeth in the horizontal direction is greater than that of the outer convex apex of the foremost insert tooth;

[0034] Correspondingly, the inner conductive sheet is assembled in the corresponding insertion hole of the insulating shell in a back-to-forward insertion direction, and the concave space between adjacent insertion protrusions on the same side of the base part two forms a waste collection groove two.

[0035] The above-mentioned technical measures are based on the special nature of the interference fit of the conductive sheet constituting the conductive terminal within the insulating shell. On the one hand, they can ensure the precise and stable insertion of the conductive sheet within the insulating shell; on the other hand, they enable the rear inserting tooth, which inserts along the insertion trajectory of the front inserting tooth, to achieve an interference fixing force that is basically consistent with the front inserting tooth, thus ensuring the stability of the conductive sheet insertion within the insulating shell; and thirdly, the plastic waste generated by the front inserting tooth during the interference fit is concentrated in the concave space between adjacent inserting teeth during relative displacement, thereby reducing the random diffusion of plastic waste and its interference with the conductivity of the conductive terminal. This is especially evident when the straight edge of the foremost inserting tooth abuts against the stop.

[0036] Furthermore, each insertion protrusion on each side of the second base portion is an oblique tooth structure that transitions outward from front to back, with a guide slope at the front of the apex of the protrusion. This technical measure not only achieves a stable interference fit effect, but also, under the guidance of the slope, allows the conductive sheet to be smoothly inserted from back to front within the insulating shell. It also increases the backward resistance of the conductive sheet within the insulating shell, thereby ensuring stable insertion of the conductive sheet within the insulating shell.

[0037] A card edge connector includes an insulating housing, a plurality of conductive terminals, and a plurality of signal terminals;

[0038] The insulating housing has several relatively independent through holes arranged in the transverse width direction corresponding to the insertion of the plug-in circuit board. These through holes are used to assemble corresponding conductive terminals and signal terminals. Each set of through holes connects the front and rear areas of the insulating housing in the direction of the plug-in circuit board insertion.

[0039] Several conductive terminals and several signal terminals are inserted and assembled into the corresponding through holes of the insulating housing;

[0040] The conductive terminals, which are installed inside the insulating housing, have their pins located in the rear region of the insulating housing and are used to connect to the PCB board; the contact arms are arranged in the front region of the insulating housing, and each conductive terminal in the horizontal direction forms a slot for connecting the corresponding plug-in circuit board.

[0041] The conductive terminals installed inside the insulating housing have any of the above-described structures, and the same group of conductive terminals forms two rows of pins arranged in a front-to-back direction in the rear region of the insulating housing.

[0042] Furthermore, each set of mounting holes within the insulating housing, used for mounting conductive terminals, consists of two relatively independent holes arranged in the height direction;

[0043] Correspondingly, the conductive terminals inserted into each set of insertion holes are arranged in two rows, upper and lower. The upper and lower rows of conductive terminals form the insertion slot of the circuit board, and the upper and lower rows of conductive terminals form four rows of pins arranged in the front-to-back direction in the rear area of ​​the insulating shell.

[0044] The card edge connector with the above-mentioned technical measures has the technical characteristics of small structural size, large current carrying capacity, easy molding and good stability due to the use of conductive terminals with the above structure.

[0045] The beneficial technical effect of this utility model is that, in view of the special characteristics of the above-mentioned edge connector, the inner and outer conductive sheets that make up the conductive terminals are formed with an L-shaped bending structure, and the pin spacing of the inner and outer conductive sheets of the conductive terminals is layered and matched, and the contact parts of the inner and outer conductive sheets are formed with a V-shaped bending structure, thereby having the following technical advantages:

[0046] The conductive terminals formed by the inner and outer conductive sheets arranged on the same side of the plug-in circuit board in the plug-in direction, with the same width, increase the cross-sectional area and contact points by double, reduce the contact resistance, and significantly increase the current carrying capacity. Moreover, the inner and outer conductive sheets form multiple contact arms on the same side of the plug-in circuit board in the plug-in direction. Compared with the traditional single-piece structure, this allows the plug-in circuit board to achieve a more stable plug-in fit in a smooth plug-in and pull-out design. This is beneficial to ensuring the stability of plug-in conductivity and also to forming a smooth plug-in and pull-out design, thereby improving the service life of the plug-in circuit board and the card edge connector.

[0047] The inner and outer conductive plates of the conductive terminal are spaced in layers, which multiplies the number of solder pads at the PCB board to which they are connected. This effectively increases the number of wiring layers on the PCB board, i.e., increases the copper layer on the PCB board, which is beneficial to improving the current carrying capacity of the PCB board. As a result, there is less constraint on the current carrying performance of the conductive terminal, and the conductive terminal can obtain high power density current carrying performance.

[0048] The L-shaped bending structure of the conductive terminal significantly reduces the length of the conductive terminal in the direction of insertion into the circuit board, thereby effectively reducing the longitudinal dimension of the formed edge connector in the direction of insertion into the gold fingers. This is beneficial for miniaturizing the structure of the formed edge connector and controlling the molding cost. Moreover, although the L-shaped bending structure of the conductive terminal is a three-dimensional structure, its three-dimensional structure is relatively regular, which reduces the design requirements of the molding mold. The molding mold is easy to form, the cost is easy to control, and the size of the formed conductive terminal structure is easy to control stably.

[0049] The contact portions of the inner and outer conductive sheets are formed with a V-shaped bending structure, which is easy to bend and form while ensuring a smooth and gentle insertion contact with the plug-in circuit board. This is especially evident compared to the contact portions of the back-bending structure in the prior art.

[0050] Therefore, the above-mentioned technical measures are conducive to obtaining small-sized, high-current-carrying, and low-cost card edge connectors. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of the structure of a conductive terminal of this utility model.

[0052] Figure 2 This is a schematic diagram of another structure of the conductive terminal of this utility model.

[0053] Figure 3 for Figure 1 and Figure 2 The diagram shows a suitable structure for the conductive terminals.

[0054] Figure 4 This is a schematic diagram of one structure of the card edge connector of this utility model.

[0055] Figure 5 for Figure 4 Cross-sectional view at point AA.

[0056] Figure 6 for Figure 5 Enlarged view of the cross-section at BB.

[0057] Figure 7 for Figure 6 A magnified view of a portion of the image.

[0058] The symbols in the diagram mean: 1—outer conductive sheet; 11—substrate part one; 12—contact arm one; 13—pin part one; 14—contact part one; 15—front insertion protrusion one; 16—rear insertion protrusion one; 17—waste collection groove one.

[0059] 2—Inner conductive sheet; 21—Base part two; 22—Contact arm two; 23—Pin part two; 24—Contact part two; 25—Front insertion protrusion two; 26—Rear insertion protrusion two; 27—Waste collection groove two;

[0060] 3—Insulating shell; 31—Upper side through hole; 32—Lower side through hole;

[0061] 4—Signal terminal. Detailed Implementation

[0062] This utility model relates to the field of electrical connector technology, specifically a high-power conductive terminal and a snap-edge connector including the terminal. The main technical solution of this utility model will be described in detail below with reference to several embodiments. Embodiment 1 is illustrated in conjunction with the accompanying drawings—that is… Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 The technical solution of this utility model is clearly and thoroughly explained; although other embodiments are not shown in separate drawings, their main structures can still be referred to the drawings of Embodiment 1.

[0063] It should be noted that the accompanying drawings of this utility model are schematic, and unnecessary details have been simplified to clarify the technical purpose of this utility model, so as to avoid obscuring the technical solution contributed by this utility model to the prior art. In addition, the expressions such as "about" and "basically" regarding quantity or fit relationship in the following text mean that reasonable assembly errors and processing errors are allowed in the industry, and do not literally describe absolute quantity or fit relationship.

[0064] Example 1

[0065] See Figure 1 , Figure 2 and Figure 3 As shown, the conductive terminals of this utility model (taking one group in a single-row structure as a unit, such as...) Figure 1 and Figure 2 As shown), it has an outer conductive sheet 1 and an inner conductive sheet 2 (the terms inner and outer are based on the direction of the conductive terminal and the insertion of the circuit board; the one arranged relatively close to the insertion direction of the circuit board is the inner one, and the one arranged relatively far away from the insertion direction of the circuit board is the outer one).

[0066] Specifically, the outer conductive sheet 1 has an integrally formed base portion 11, contact arms 12, and pin portions 13. Multiple contact arms 12 are arranged at intervals along the horizontal width of the front side of the base portion 11, meaning the contact arms 12 extend from the front side of the base portion 11, and the multiple contact arms 12 are distributed in a finger-like structure on the front side of the base portion 13. At the front end of each contact arm 12, there is a contact portion 14 that bends on the side that mates with the plug-in circuit board. The contact portion 14 is formed with a V-shaped bend structure, and the bend apex of the contact portion 14 serves as the contact with the plug-in circuit board. Therefore, the bend apex of the V-shaped bend structure of the contact portion 14 has a smoothly transitioned rounded corner structure. Typically, the angle α between the front folded edge of the contact portion 14 (i.e., the folded edge away from the base portion 11) and the horizontal plane where the plug-in circuit board is inserted is selected within the range of 25 to 70° (e.g., 25°, 40°, 50°, or 70°, depending on design requirements). The pin portion 13 extends from the rear side of the base portion 11, bends, and mates with the base portion 11 in an approximately L-shaped structure. The bottom of the pin portion 13 has multiple pins arranged in a finger-like pattern. The aforementioned expressions of "front" and "rear" are based on the direction of conforming to the insertion circuit board. The direction of conforming to the insertion circuit board is "front," and the opposite is "rear" (the same below). The aforementioned expression of "horizontal width" is based on the direction perpendicular to the insertion direction of the insertion circuit board, that is, the length direction of the insertion slot of the following edge connector used for inserting the insertion circuit board (the same below).

[0067] In order to allow the outer conductive piece 1 to be directly inserted and fixed in the insulating housing of the following edge connector without the connecting block, two insertion protrusions are respectively formed on both sides of the base part 11 in the horizontal direction of the outer conductive piece 1: the front insertion protrusion 15 and the rear insertion protrusion 16. When the outer conductive piece 1 is assembled in the insulating housing, it is interference-fitted in the corresponding insertion hole through the insertion protrusions on both sides of the base part 11. The insertion protrusions on both sides of the horizontal width of the base part 11 are basically arranged symmetrically from left to right.

[0068] The outer conductive piece 1 is installed in the insulating housing in the following manner, with the outer conductive piece 1 being assembled in the corresponding insertion hole of the insulating housing in the insertion direction from back to front.

[0069] To accommodate the aforementioned insertion direction, on each side of the base portion 11 of the outer conductive sheet 1, the leading edge of the front insertion protrusion 15 is a straight edge structure, the outer protrusion apex of the front insertion protrusion 15 is located in the rear region, and the front region of the front insertion protrusion 15 (i.e., the front region of the front insertion protrusion 15 along the insertion direction) has an insertion guide slope, so that the front insertion protrusion 15 is a slanted tooth structure that transitions outward from front to back. When the outer conductive piece 1 is inserted into the insulating shell, the front insertion protrusion 15 abuts against the limiting stop of the corresponding insertion hole through the straight edge structure of the front edge, so as to ensure accurate insertion and block the forward diffusion of scraping waste at the insertion path; the front insertion protrusion 15 is interference-fitted with the hole wall of the corresponding insertion hole through the outer protrusion apex of the rear region; the front region of the front insertion protrusion 15 is clearance-fitted with the hole wall of the corresponding insertion hole, so as to ensure the smooth insertion of the outer conductive piece 1 from back to front and minimize the generation of scraping waste.

[0070] To accommodate the aforementioned insertion direction, on each side of the base portion 11 of the outer conductive sheet 1, the outer convex vertex of the rear insertion tooth 16 is located in the rear region, and the front region of the rear insertion tooth 16 (i.e., the front region of the rear insertion tooth 16 along the insertion direction) has an insertion guide slope, making the rear insertion tooth 16 a convex tooth structure that transitions from front to back. Moreover, to accommodate interference fit and in the insertion sequence from back to front, the front insertion tooth 15 has a certain scraping trajectory on the wall surface corresponding to the insertion hole, and the rear insertion tooth 16 is inserted along this scraping trajectory (the front insertion tooth 15 actually creates a certain hole-enlarging effect on the insertion position of the rear insertion tooth 16), and the convex height of the outer convex vertex of the rear insertion tooth 16 in the horizontal direction is slightly greater than that of the outer convex vertex of the front insertion tooth 15.

[0071] Furthermore, due to repeated experiments in the interference fit of the conductive sheet, it was found that the scraped waste chips usually have a displacement opposite to the insertion direction. Therefore, in order to reduce the diffusion of scraped waste chips and achieve the effect of collection, a waste chip collection groove 17 is formed in the concave space between the adjacent insertion protrusions on the same side of the substrate part 11 - namely the front insertion protrusion 15 and the rear insertion protrusion 16.

[0072] The inner conductive sheet 2 has an integrally formed base portion 21, contact arms 22, and pin portions 23. Multiple contact arms 22 are arranged at intervals along the horizontal width of the front side of the base portion 21, extending from the front side of the base portion 21. These contact arms 22 are distributed in a finger-like structure on the front side of the base portion 23. At the front end of each contact arm 22, there is a contact portion 24 that bends on the side that mates with the plug-in circuit board. The contact portion 24 is formed with a V-shaped bend, and the bend apex of the contact portion 24 serves as the contact point with the plug-in circuit board. Therefore, the bend apex of the V-shaped bend structure of the contact portion 24 has a smoothly transitioned rounded corner structure. Typically, the angle α between the front folded edge of the contact portion 24 (i.e., the folded edge away from the base portion 21) and the horizontal plane where the plug-in circuit board is inserted is selected within the range of 25 to 70° (e.g., 25°, 40°, 50°, or 70°, depending on design requirements). The second pin portion 23 extends from the rear side of the second base portion 21, and is bent and fits the second base portion 21 in an approximately L-shaped structure. The bottom of the second pin portion 23 has multiple pins arranged in a finger-like pattern.

[0073] In order to allow the inner conductive piece 2 to be directly inserted and fixed in the insulating housing of the following edge connector without the connecting block, two insertion protrusions are respectively formed on both sides of the base part 21 of the inner conductive piece 2 in the horizontal direction - namely, front insertion protrusion 25 and rear insertion protrusion 26. When the inner conductive piece 2 is assembled in the insulating housing, it is interference-fitted in the corresponding insertion hole through the insertion protrusions on both sides of the base part 21. The insertion protrusions on both sides of the horizontal width of the base part 21 are basically arranged symmetrically from left to right.

[0074] The inner conductive sheet 2 is installed in the insulating housing in the following manner, and is assembled in the corresponding insertion hole of the insulating housing in the insertion direction from back to front.

[0075] To accommodate the aforementioned insertion direction, on each side of the substrate portion 21 of the inner conductive sheet 2, the leading edge of the front insertion protrusion 25 is a straight edge structure, the outer apex of the front insertion protrusion 25 is located in the rear region, and the front region of the front insertion protrusion 25 (i.e., the front region of the front insertion protrusion 25 along the insertion direction) has an insertion guide slope, so that the front insertion protrusion 25 is a slanted tooth structure that transitions outward from front to back. When the inner conductive sheet 2 is inserted into the insulating shell, the front insertion protrusion 25 abuts against the limiting stop of the corresponding insertion hole through the straight edge structure of the front edge, so as to ensure accurate insertion and block the forward diffusion of scraping waste at the insertion path; the front insertion protrusion 25 is interference-fitted with the hole wall of the corresponding insertion hole through the outer convex apex of the rear region; the front region of the front insertion protrusion 25 is clearance-fitted with the hole wall of the corresponding insertion hole, so as to ensure the smooth insertion of the inner conductive sheet 2 from back to front and minimize the generation of scraping waste.

[0076] To accommodate the aforementioned insertion direction, on each side of the substrate portion 21 of the inner conductive sheet 2, the outer apex of the rear insertion tooth 26 is located in the rear region, and the front region of the rear insertion tooth 26 (i.e., the front region of the rear insertion tooth 26 along the insertion direction) has an insertion guide slope, making the rear insertion tooth 26 a slanted tooth structure that transitions outward from front to back. Moreover, to accommodate interference fit and in the back-to-front insertion sequence, the front insertion tooth 25 has a certain scraping trajectory on the wall surface corresponding to the insertion hole, and the rear insertion tooth 26 is inserted along this scraping trajectory (the front insertion tooth 25 actually creates a certain hole-enlarging effect on the insertion position of the rear insertion tooth 26), and the convex height of the outer apex of the rear insertion tooth 26 in the horizontal direction is slightly greater than that of the outer apex of the front insertion tooth 25.

[0077] Furthermore, due to repeated experiments in the interference fit of the conductive sheet, it was found that the scraped waste chips usually have a displacement opposite to the insertion direction. Therefore, in order to reduce the diffusion of scraped waste chips and achieve the effect of collection, a waste chip collection groove 27 is formed in the concave space between the adjacent insertion protrusions on the same side of the substrate part 21 - that is, the front insertion protrusion 25 and the rear insertion protrusion 26.

[0078] As can be seen from the molding structure of the upper inner conductive sheet 2 and the outer conductive sheet 1, their molding structures are basically the same. Of course, the two need to form the following mating relationship.

[0079] The contact arm 12 of the outer conductive sheet 1 and the contact arm 22 of the inner conductive sheet 2 are arranged on the same side of the insertion direction of the plug-in circuit board. The contact arm 22 on the inner conductive sheet 2 and the contact arm 12 on the outer conductive sheet 1 form an inner-outer one-to-one correspondence at their relative arrangement positions (that is, the contact arm 22 of the inner conductive sheet 2 is arranged on the inner side, and the contact arm 12 of the outer conductive sheet 1 is arranged on the outer side, and the contact arms of the two are in one-to-one correspondence). The front end of the contact arm 22 of the inner conductive sheet 2 and the contact part 14 of the outer conductive sheet 1 are arranged at a distance in the insertion direction of the plug-in circuit board. Thus, during the insertion process of the circuit board from the outside to the inside ("outside" refers to the outside of the slot of the card edge connector, and "inside" refers to the inside of the slot of the card edge connector, the same below), the contact portion 14 of the outer conductive piece 1 contacts the circuit board before the contact portion 24 of the inner conductive piece 2; of course, during the process of pulling out the circuit board from the inside to the outside, the contact portion 24 of the inner conductive piece 2 disengages from the circuit board before the contact portion 14 of the outer conductive piece 1.

[0080] Furthermore, the V-shaped bending angle of the contact portion 24 of the inner conductive sheet 2 is slightly larger than that of the contact portion 14 of the outer conductive sheet 1. This is because the inner and outer conductive sheets need to form a balanced contact with the plug-in circuit board due to the difference in their arrangement positions. Of course, this bending angle is not the only consideration; it can also be adjusted by bending the contact arm 22 of the inner conductive sheet 2 and / or the contact arm 12 of the outer conductive sheet 1, even under the condition that the V-shaped bending angles are the same.

[0081] like Figure 1 and Figure 2 As shown, the inner and outer conductive sheets constituting the conductive terminals are typically stacked together in the thickness direction (i.e., the layer thickness direction of the outer conductive sheet 1 and the inner conductive sheet 2, corresponding to the height direction of the edge connector) to facilitate neat installation within the insulating housing. To ensure the integrity, rigidity, and improved electrical performance of the stack, the outer conductive sheet 1's base portion 11 and the inner conductive sheet 2's base portion 21 are ultrasonically welded together at the stacking point. This results in a flat, straight contact arm 12 of the outer conductive sheet 1, while the inner conductive sheet 2's contact arm 22 has a distinct bend at the base portion 21, allowing the contact arms of the stacked inner and outer conductive sheets to form a forked fit and ensuring a staggered fit between the contact portions of the inner and outer conductive sheets. Of course, the pin portion 13 of the outer conductive sheet 1 and the pin portion 23 of the inner conductive sheet 2 form a layered fit with a spacing, which is beneficial to increase the number of solder pads on the PCB board and the copper layer arrangement on the PCB board, thereby improving the current carrying capacity.

[0082] Between the aforementioned stacked inner and outer conductive sheets, in order to improve the consistency and convenience of insertion into the insulating shell, the insertion protrusions on both sides of the two base portions in the horizontal direction basically form a continuity in the thickness direction. That is, the two insertion protrusions on each side of the base portion 11 basically overlap with the two insertion protrusions on the same side of the base portion 21, forming a continuous fit in the thickness direction.

[0083] See Figure 3As shown, the conductive terminals of this utility model, when typically used in the insulating housing of a card edge connector, form two rows of mating parts, one upper and one lower. The upper row has inner and outer conductive sheets as described above, and the lower row has inner and outer conductive sheets as described above. The upper and lower rows of conductive terminals form a slot for inserting into a circuit board. The four conductive sheets of the upper and lower rows of conductive terminals form four rows of pins. Based on the L-shaped bending structure of the conductive terminals, the longitudinal length (corresponding to the insertion direction of the circuit board) of the upper conductive terminals is significantly greater than that of the lower conductive terminals. Furthermore, due to the staggered arrangement of the inner and outer conductive sheets of the same conductive terminal, the longitudinal length of the outer conductive sheet of the upper conductive terminal is significantly greater than that of the inner conductive sheet. The difference in the longitudinal length of the upper and lower rows of conductive terminals is mainly reflected in the longitudinal length of the base and the height of the pin. The longitudinal length of the contact arm is similar, and the contact parts of the upper and lower rows of conductive terminals are basically symmetrical.

[0084] See Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the card edge connector of this utility model includes an insulating shell 3, a plurality of conductive terminals as described above, and a plurality of signal terminals 4.

[0085] Specifically, the insulating housing 3 has several relatively independent through holes arranged in the transverse direction corresponding to the insertion of the plug-in circuit board, used for assembling corresponding conductive terminals and signal terminals. Each set of through holes connects the front and rear areas of the insulating housing 3 corresponding to the insertion direction of the plug-in circuit board; each set of through holes consists of two relatively independent through holes in the height direction (compared to the transverse direction, but perpendicular to the insertion direction of the plug-in circuit board in another direction) – namely, the upper through hole 31 and the lower through hole 32. The dimension of each through hole in the height direction allows the three-dimensional structure of the front contact portion of the corresponding conductive terminal to pass through; the dimension of each through hole in the transverse direction matches the base portion of the corresponding conductive terminal through an interference fit with the insertion protrusion; each through hole has a positioning stop with an inward fold at its leading edge (i.e., smaller than the transverse width dimension of the conductive terminal base portion).

[0086] In the through-hole arrangement structure of the insulating housing 3, the conductive terminals and signal terminals are arranged in a concentrated manner. Several signal terminals 4 are inserted into the corresponding through-holes on the insulating housing 3.

[0087] The conductive terminals of the above structure are installed in the corresponding through holes on the insulating housing 3 according to the through-hole structure of the base part of the above structure. That is, the conductive terminals installed in each set of through holes (upper through hole 31 and lower through hole 32) on the insulating housing 3 are in two rows, upper and lower. The upper row of conductive terminals is installed in the current upper through hole 31 of the insulating housing 3, and the lower row of conductive terminals is installed in the current lower through hole 32 of the insulating housing 3. The upper and lower rows of conductive terminals in the same set of through holes are used as the slots to form the plug-in circuit board.

[0088] The conductive terminals are installed inside the insulating housing 3, with the pins located in the rear area of ​​the insulating housing 3. Between the upper and lower rows of conductive terminals, four rows of pins are arranged in the front-to-back direction in the rear area of ​​the insulating housing 3 for connecting to the PCB board. The contact arms are arranged in the front area of ​​the insulating housing 3, between the upper and lower rows of conductive terminals, forming a slot for inserting the circuit board in the front area of ​​the insulating housing 3. The slots formed by the conductive terminals in the horizontal direction are connected to the horizontal width of the circuit board to be inserted.

[0089] Example 2

[0090] The rest of the content of this embodiment is the same as that of embodiment 1, except that:

[0091] The conductive terminals forming the slot of the plug-in circuit board are arranged in a single row in conjunction with other conductive structures. That is, the conductive terminals of this utility model are arranged on the upper / lower side of the plug-in direction of the plug-in circuit board, and the other side is other conventional conductive structures.

[0092] Example 3

[0093] The rest of the content of this embodiment is the same as that of embodiment 1, except that:

[0094] The conductive sheet substrate has three insertion protrusions on the same side, arranged in a front-to-back pattern. The height of the outer protrusion apex of these three insertion protrusions increases sequentially from front to back.

[0095] Example 4

[0096] The rest of the content of this embodiment is the same as that of embodiment 1, except that:

[0097] The insertion protrusion structure on the conductive sheet substrate is eliminated. Instead, a connecting block that matches the corresponding through hole in the insulating shell is connected to the substrate. The connecting block carries the conductive sheet to be assembled in the corresponding through hole in the insulating shell.

[0098] Example 5

[0099] The rest of the content of this embodiment is the same as that of embodiment 1, except that:

[0100] The contact portion on the front side of each conductive sheet has a single structure, that is, a single contact arm extends from the front side of the base portion.

[0101] Example 6

[0102] The rest of the content of this embodiment is the same as that of embodiment 1, except that:

[0103] The base portion one of the outer conductive sheet and the base portion two of the inner conductive sheet are fixed together as a whole by riveting at the overlapping part.

[0104] Example 7

[0105] The rest of the content of this embodiment is the same as that of embodiment 1, except that:

[0106] The base portion one of the outer conductive sheet and the base portion two of the inner conductive sheet are fixed together as a whole at the overlapping part by a positioning pin.

[0107] The above embodiments are only used to illustrate the present invention and are not intended to limit it.

[0108] Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications can still be made to the above embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the present invention.

Claims

1. A high-power conductive terminal having an outer-side conductive sheet (1) and an inner-side conductive sheet (2); characterized in that: the outer-side conductive sheet (1) has a base portion one (11), a contact arm one (12) extending from the front side of the base portion one (11), and a pin portion one (13) extending from the rear side of the base portion one (11) and bent to cooperate with the base portion one (11) in an L-shaped structure, the contact arm one (12) having a contact portion one (14) with a bent structure at the side of cooperating with a plug-in circuit board; the inner-side conductive sheet (2) has a base portion two (21), a contact arm two (22) extending from the front side of the base portion two (21), and a pin portion two (23) extending from the rear side of the base portion two (21) and bent to cooperate with the base portion two (21) in an L-shaped structure, the contact arm two (22) having a contact portion two (24) with a bent structure at the side of cooperating with the plug-in circuit board; the contact arm one (12) of the outer-side conductive sheet (1) and the contact arm two (22) of the inner-side conductive sheet (2) are arranged on the same side in the direction of cooperating with the plug-in circuit board, and during the process of cooperating with the plug-in circuit board from the outside to the inside, the contact portion one (14) of the outer-side conductive sheet (1) contacts the plug-in circuit board earlier than the contact portion two (24) of the inner-side conductive sheet (2); and the pin portion one (13) of the outer-side conductive sheet (1) and the pin portion two (23) of the inner-side conductive sheet (2) are spaced apart and cooperated in layers.

2. The high-power conductive terminal according to claim 1, characterized in that: the contact arm one (12) of the outer-side conductive sheet (1) is a plurality of contact arms arranged in a spaced apart manner in the transverse width direction of the front side of the base portion one (11); the contact arm two (22) of the inner-side conductive sheet (2) is a plurality of contact arms arranged in a spaced apart manner in the transverse width direction of the front side of the base portion two (21); and each contact arm two (22) of the inner-side conductive sheet (2) and each contact arm one (12) of the outer-side conductive sheet (1) form a one-to-one corresponding cooperation relationship at the relative arrangement position.

3. The high-power conductive terminal according to claim 1 or 2, characterized in that: the contact portion one (14) of the outer-side conductive sheet (1) is formed at the front end of the contact arm one (12) in a V-shaped bent structure; the contact portion two (24) of the inner-side conductive sheet (2) is formed at the front end of the contact arm two (22) in a V-shaped bent structure; and the front end of the contact arm two (22) of the inner-side conductive sheet (2) and the contact portion one (14) of the outer-side conductive sheet (1) are arranged in a spaced apart manner in the direction of cooperating with the plug-in circuit board.

4. The high-power conductive terminal according to claim 3, characterized in that: the V-shaped bent structure has a smooth transition rounded corner structure at the bending vertex; and the included angle (α) between the front side of the V-shaped bent structure and the horizontal plane of cooperating with the plug-in circuit board is 25-70°.

5. The high-power conductive terminal according to claim 1 or 2, characterized in that: The base part one (11) of the outer side conductive sheet (1) and the base part two (21) of the inner side conductive sheet (2) are overlapped together in the thickness direction.

6. The high-power conductive terminal according to claim 5, characterized in that: The overlapping part of the outer side conductive sheet (1) and the inner side conductive sheet (2) is fixed by ultrasonic welding.

7. The high-power conductive terminal according to claim 1 or 2, characterized in that: The base part one (11) of the outer side conductive sheet (1) has protruding insertion teeth on both sides in the transverse direction, and the outer side conductive sheet (1) is fitted in the corresponding through hole by the protruding insertion teeth on both sides of the base part one (11) when fitted in the insulating shell; And / or, the base part two (21) of the inner side conductive sheet (2) has protruding insertion teeth on both sides in the transverse direction, and the inner side conductive sheet (2) is fitted in the corresponding through hole by the protruding insertion teeth on both sides of the base part two (21) when fitted in the insulating shell.

8. The high-power conductive terminal according to claim 7, characterized in that: The insertion teeth on each side of the base part one (11) are arranged in multiple in the front-rear direction; The front edge of the frontmost insertion tooth is a straight edge structure, and the protruding top point is in the rear region; when the outer side conductive sheet (1) is fitted in the corresponding through hole of the insulating shell, the frontmost insertion tooth is abutted and matched with the limiting stop of the corresponding through hole by the straight edge structure of the front edge, and is interference-fitted with the hole wall of the corresponding through hole by the protruding top point in the rear region, and the front region is gap-fitted with the hole wall of the corresponding through hole; The protruding height of the protruding top point of the remaining insertion teeth in the transverse direction is greater than that of the frontmost insertion tooth; Correspondingly, the outer side conductive sheet (1) is fitted in the corresponding through hole of the insulating shell in the fitting direction from back to front, and the inner recess space between the adjacent insertion teeth on the same side of the base part one (11) forms a scrap collecting groove one (17).

9. The high-power conductive terminal according to claim 8, characterized in that: Each insertion tooth on each side of the base part one (11) is a bevel tooth structure that is transitioned outward from front to back, and has a fitting guide slope on the front side of the protruding top point.

10. The high-power conductive terminal according to claim 7, characterized in that: The insertion teeth on each side of the base part two (21) are arranged in multiple in the front-rear direction; The front edge of the frontmost insertion tooth is a straight edge structure, and the protruding top point is in the rear region; when the inner side conductive sheet (2) is fitted in the corresponding through hole of the insulating shell, the frontmost insertion tooth is abutted and matched with the limiting stop of the corresponding through hole by the straight edge structure of the front edge, and is interference-fitted with the hole wall of the corresponding through hole by the protruding top point in the rear region, and the front region is gap-fitted with the hole wall of the corresponding through hole; The protruding height of the protruding top point of the remaining insertion teeth in the transverse direction is greater than that of the frontmost insertion tooth. Correspondingly, the inner side conductive sheet (2) is assembled in the corresponding through hole of the insulating shell in the rear-to-front direction, and the inner recess space between the adjacent insertion convex teeth on the same side of the base part two (21) forms the debris collection groove two (27).

11. The high power conductive terminal of claim 10, wherein: Each insertion convex tooth on each side of the base part two (21) is a bevel tooth structure that transitions outwardly from front to back, and has a through direction guiding slope at the front side of the outward convex vertex.

12. A card edge connector, comprising an insulating shell (3), a plurality of conductive terminals and a plurality of signal terminals; The insulating shell (3) is arranged with a plurality of relatively independent through holes for assembling corresponding conductive terminals and signal terminals in the corresponding direction of the inserted circuit board, and each group of through holes is connected to the front side area and the rear side area of the insulating shell (3) in the direction of the inserted circuit board; A plurality of conductive terminals and a plurality of signal terminals are inserted and assembled in the corresponding through holes of the insulating shell (3); The conductive terminals inserted and positioned in the insulating shell (3) have the pin part at the rear side area of the insulating shell (3) for connecting the PCB board, and the contact arm is arranged at the front side area of the insulating shell (3), and each conductive terminal in the horizontal direction forms a slot for connecting the corresponding inserted circuit board; Characterized in that: The conductive terminals inserted in the insulating shell (3) have the structure of any one of claims 1 to 11, and the same group of conductive terminals forms two rows of pins arranged in the front-to-rear direction at the rear side area of the insulating shell (3).

13. The card edge connector of claim 12, wherein: Each group of through holes in the insulating shell (3) for inserting conductive terminals is arranged relatively independently in the height direction; Correspondingly, the conductive terminals inserted in each group of through holes are arranged in two rows, and the two rows of conductive terminals form a slot for the inserted circuit board, and the two rows of conductive terminals form four rows of pins arranged in the front-to-rear direction at the rear side area of the insulating shell (3).

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