CN219498242U - Press-fit connector and electronic system - Google Patents

Abstract

Embodiments of the present disclosure provide a press-fit connector and an electronic system. The press-fit connector includes: an insulating housing provided with a clamping groove extending in the longitudinal direction and recessed in the vertical direction; a plurality of conductive elements retained on the insulative housing, each of the plurality of conductive elements including an electrical contact header, a press-fit contact tail, an intermediate portion connected between the electrical contact header and the press-fit contact tail, the electrical contact header being bent into the card slot, the electrical contact header including an electrical contact surface located in the card slot, the press-fit contact tail being bent out of the insulative housing from the intermediate portion, the press-fit contact tail including a press-fit surface facing away from an opening of the card slot. The press-fit connector can be easily mounted to or dismounted from the printed circuit board at the user or in the factory. Thus, for example, in the performance test of the add-on card, the press-fit connector is damaged by repeated insertion and removal, and a new press-fit connector can be easily and conveniently replaced.

Description

Press-fit connector and electronic system

Technical Field

The present disclosure relates generally to the field of connector technology, and in particular, to a press-fit connector and an electronic system.

Background

Card edge connectors are used in many electronic systems. Manufacturing an electronic system on several Printed Circuit Boards (PCBs) connected to each other by a card edge connector is generally easier and more cost effective than manufacturing an electronic system as a single component. Conventional arrangements for interconnecting several PCBs typically use one PCB as a motherboard. Other PCBs, referred to as daughter boards or daughter cards, are then connected to the motherboard by card edge connectors to effect interconnection of the PCBs.

In existing designs, the card edge connector is typically mounted to the motherboard in the factory using either through-hole mounting technology (THT) or Surface Mount Technology (SMT). This results in longer manufacturing cycles and higher costs. How to reduce the manufacturing cycle and the manufacturing cost of the card edge connector is a big issue discussed in the application.

Disclosure of Invention

In order to at least partially solve the problems in the prior art, according to one aspect of the present disclosure, a press-fit connector is provided. The press-fit connector includes: the insulation shell is provided with a clamping groove which extends along the longitudinal direction and is recessed along the vertical direction; and a plurality of conductive elements retained on the insulating housing, each of the plurality of conductive elements including an electrical contact head, a press-fit contact tail, and an intermediate portion connected between the electrical contact head and the press-fit contact tail, the electrical contact head being bent into the card slot, the electrical contact head including an electrical contact surface within the card slot, the press-fit contact tail being bent out of the insulating housing from the intermediate portion, the press-fit contact tail including a press-fit surface facing away from an opening of the card slot.

Illustratively, at least one of the two opposite sides of the press-fit contact tail in the longitudinal direction is provided with a protruding wing.

Illustratively, the wing includes a first wing and a second wing disposed on the two sides of the press-fit contact tail.

Illustratively, the first and second wings are symmetrically disposed on the two sides of the press-fit contact tail.

Illustratively, the press-fit contact tail includes a root end connected to the intermediate portion and a tip end opposite the root end, the wing portion being less distant from the root end than the tip end.

Illustratively, the press-fit surface is located between the wing and the tip.

Illustratively, the press-fit contact tail is connected to a middle portion of the intermediate portion in the longitudinal direction, the intermediate portion extends beyond the press-fit contact tail toward both sides in the longitudinal direction, and the wing portion does not extend beyond the intermediate portion in the longitudinal direction.

Illustratively, the intermediate portion extends in the vertical direction and the wing portion is spaced from the intermediate portion by a distance of between 0.3mm and 0.5mm in a transverse direction perpendicular to the longitudinal direction and the vertical direction.

Illustratively, the intermediate portion extends in the vertical direction, and the electrical contact surface is less than or equal to 0.5mm from the intermediate portion.

Illustratively, the press-fit contact tail has a dimension between 2.4mm and 2.8mm in a transverse direction perpendicular to the longitudinal direction and the vertical direction.

Illustratively, the thickness of the intermediate portion is greater than the thickness of the press-fit contact tail portion.

Illustratively, the intermediate portion has a thickness of between 0.2mm and 0.3 mm.

Illustratively, the press-fit contact tail has a thickness of between 0.18mm and 0.22 mm.

According to another aspect of the present disclosure, there is also provided a press-fit connector. The press-fit connector includes: an insulating housing provided with a clamping groove extending in the longitudinal direction; and a plurality of conductive elements retained on the insulating housing, each of the plurality of conductive elements including an electrical contact header, a press-fit contact tail, and an intermediate portion connected between the electrical contact header and the press-fit contact tail, the electrical contact header being bent into the card slot, the press-fit contact tail being bent out of the insulating housing from the intermediate portion, the insulating housing having opposed first and second sides along a transverse direction perpendicular to the longitudinal direction, the first and second sides being provided with at least one pair of mounting portions, each of the at least one pair of mounting portions including mounting projections and mounting grooves disposed on different sides, the mounting projections and mounting grooves within each of the at least one pair of mounting portions being matingly shaped with the mounting grooves, and the mounting projections and mounting grooves within each of the at least one pair of mounting portions being aligned along the transverse direction.

Illustratively, the first side and the second side are provided with a plurality of pairs of mounting portions, the pairs of mounting portions are arranged at intervals along the longitudinal direction, and the mounting portions of two adjacent pairs of mounting portions on the same side include a mounting protrusion and a mounting groove.

Illustratively, three pairs of mounting portions are provided on the first and second sides.

According to yet another aspect of the present disclosure, an electronic system is also provided. An electronic system includes a printed circuit board and a press-fit connector, the press-fit connector comprising: an insulating housing provided with a clamping groove extending in the longitudinal direction; and a plurality of conductive elements held on the insulating housing, each of the plurality of conductive elements having a press-fit contact tail extending out of the insulating housing, wherein the printed circuit board is provided with two rows of contact pads arranged in the longitudinal direction, the plurality of conductive elements being arranged in two rows extending in the longitudinal direction on both sides of the card slot, the two rows of contact pads being press-fitted in one-to-one correspondence with the press-fit contact tails of the plurality of conductive elements.

Illustratively, the spacing between the opposite ends of the two rows of contact pads is between 2.4mm and 3.2mm in a transverse direction perpendicular to the longitudinal direction.

Illustratively, the spacing between the opposite ends of the two rows of contact pads is between 6.6mm and 7.2mm in a transverse direction perpendicular to the longitudinal direction.

Embodiments of the present disclosure provide a press-fit connector that can be easily mounted to or dismounted from a printed circuit board at a user or in a factory. Thus, for example, in the performance test of the add-on card, the press-fit connector is damaged by repeated insertion and removal, and a new press-fit connector can be easily and conveniently replaced. In addition, the welding process is reduced, so that the manufacturing time is shortened, and the manufacturing cost is reduced.

In the summary, a series of concepts in a simplified form are introduced, which will be further described in detail in the detailed description section. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

Advantages and features of the disclosure are described in detail below with reference to the accompanying drawings.

Drawings

The following drawings of the present disclosure are included as part of the disclosure herein for purposes of understanding the same. Embodiments of the present disclosure and descriptions thereof are shown in the drawings to explain the principles of the disclosure. In the drawings of which there are shown,

FIG. 1 is a perspective view of an electronic system according to an exemplary embodiment of the present disclosure;

FIG. 2 is a cross-sectional perspective view of the electronic system shown in FIG. 1;

FIG. 3 is a cross-sectional side view of the electronic system shown in FIG. 1;

FIG. 4 is an enlarged partial view of a printed circuit board according to an exemplary embodiment of the present disclosure;

FIG. 5 is a perspective view of a press-fit connector according to one exemplary embodiment of the present disclosure;

FIG. 6 is a top view of a plurality of the press-fit connectors shown in FIG. 5 arranged in a lateral direction;

FIG. 7 is an enlarged partial view of an angle of the press-fit connector shown in FIG. 5;

FIG. 8 is a partial cross-sectional view of the press-fit connector shown in FIG. 5;

FIG. 9 is an enlarged partial view of another angle of the press-fit connector shown in FIG. 5;

FIG. 10 is an exploded view of the press-fit connector shown in FIG. 5;

FIG. 11 is an enlarged partial view of an insulating housing according to an exemplary embodiment of the present disclosure;

fig. 12 is a perspective view of a conductive element according to an exemplary embodiment of the present disclosure;

Fig. 13 is an enlarged view of a portion of the conductive element shown in fig. 12;

fig. 14 is a side view of the conductive element shown in fig. 12; and

fig. 15 is a partial enlarged view of the conductive element shown in fig. 14.

Wherein the above figures include the following reference numerals:

100. 100', press-fit connectors; 200. an insulating housing; 201. a butt joint surface; 202. a mounting surface; 210. a clamping groove; 221. a first side; 222. a second side; 230. a mounting part; 231. 231', mounting bosses; 232. 232', mounting grooves; 233. a through hole; 240. a partition rib; 250. a channel; 300. a conductive element; 310. an electrical contact head; 311. an electrical contact surface; 320. press-fit contact tails; 321. a root end; 322. a tip end; 323. a press-fit surface; 330. an intermediate portion; 331. a barb; 340. a wing portion; 341. a first wing; 342. a second wing; 343. a back surface; 400. a reinforcing member; 900. a printed circuit board; 910. a contact plate; 911. opposite ends; 912. opposite ends.

Detailed Description

In the following description, numerous details are provided to provide a thorough understanding of the present disclosure. However, it will be understood by those skilled in the art that the following description illustrates preferred embodiments of the present disclosure by way of example only and that the present disclosure may be practiced without one or more of these details. Furthermore, some technical features that are known in the art have not been described in detail in order to avoid obscuring the present disclosure.

In the following description, numerous details are provided to provide a thorough understanding of the present disclosure. However, it will be understood by those skilled in the art that the following description illustrates preferred embodiments of the present disclosure by way of example only and that the present disclosure may be practiced without one or more of these details. Furthermore, some technical features that are known in the art have not been described in detail in order to avoid obscuring the present disclosure.

DDR5 (double data Rate 5 th generation) is a memory specification currently widely used for computers. In some applications, such as DDR5 DIMM card testing, new requirements are placed on the resistance to frequent plugging of DDR5 card edge connectors, such as the desire to plug more than 10 ten thousand times. Frequent plug resistance may be achieved by modifying the electrical contact heads of the conductive elements on the electrical connector in structure and material (e.g., plating of the contact surfaces). However, it has been found in DDR5 DIMM card testing that the electrical connector is inevitably damaged after multiple plugging. The inventors have appreciated and appreciated that a press-fit connector may be used to connect a card to be tested to a printed circuit board, and that a new electrical connector may be easily replaced even if the electrical connector is inevitably damaged during the plugging process. The insulating housing of the press-fit connector may be provided with a clamping groove extending in the longitudinal direction and a plurality of conductive elements. A plurality of conductive elements may be disposed on both sides of the card slot. Each conductive element may include an electrical contact head bent into the card slot, a press-fit contact tail protruding out of the insulative housing, and an intermediate portion connected between the electrical contact head and the press-fit contact tail. The press-fit contact tails of the plurality of conductive elements may be press-fit with contact pads on the printed circuit board, rather than soldered to the printed circuit board. The conductive element of the press-fit connector can be electrically connected with the contact pad on the printed circuit board without soldering, so that the replacement is more convenient.

The inventors have also appreciated and appreciated that conventional configurations of press-fit contact tails are not capable of meeting normal pressure requirements with contact pads on a printed circuit board where there is limited mounting space on the printed circuit board using, for example, a DDR5 card edge connector. The press-fit contact tail of conventional construction may yield permanently. The joint electronics engineering council (Joint Electron Device Engineering Council, JEDEC) specifies standards for some DDR5 card edge connectors. The DDR5 standard card edge connector needs to be configured to meet the signal integrity requirements in JEDEC 45.5. See JEDEC45.5, some parameters that limit signal integrity in the case of 20GHz bandwidth, including end reflection loss (ended return loss), end insertion loss (ended insertion loss), end crosstalk such as near end crosstalk (Near End Crosstalk, NEXT) and far end crosstalk (Far End Crosstalk, FEXT), and the like.

In some embodiments, the sides of the press-fit contact tail may be provided with protruding wings. The wing can adjust the bulk resistance of the press-fit contact tail, which can improve signal integrity. Also, the wing may increase the longitudinal width of the press-fit contact tail so that a greater normal pressure may be sustained, thereby improving the contact resistance between the press-fit contact tail 320 and the contact pad 910, improving signal integrity. In some embodiments, the thickness of the press-fit contact tail is set to be less than the thickness of the intermediate portion. The method is equivalent to thinning the press-fit contact tail, so that the problem of permanent yield of the press-fit contact tail can be improved. Thus, the press-fit contact tail is not permanently yielding with increasing normal pressure.

In some embodiments, the middle portion of the plurality of conductive elements may be closer to the center of the card slot such that the press-fit contact tail portions may extend from a position closer to the card slot, toward both sides of the insulating housing, in a lateral direction perpendicular to the longitudinal direction. Accordingly, the wing portions may also be closer to the center of the card slot. The wing portions may be closer to the force center so that the wing portions may better share the normal pressure experienced by the press-fit contact tail portions. Furthermore, for two press-fit connectors that are adjacent in the lateral direction, the tips of two adjacent rows of press-fit contact tails (i.e., the ends that are distal from the intermediate portion) on different press-fit connectors may be relatively distal from each other. Two rows of contact pads on the printed circuit board that are in electrical contact with the two adjacent rows of press-fit contact tails may be spaced apart from each other, thereby reducing cross-talk and improving signal integrity.

The sides of the insulative housing of the press-fit connector are typically provided with mechanical connection structures that may be provided with through holes through which threaded fasteners, such as screws, may be secured to the printed circuit board, thereby allowing the press-fit contact tails to exert a stable normal pressure on the contact pads of the printed circuit board. In some embodiments, the mechanical connection structures on two press-fit connectors adjacent in the lateral direction may protrude into the mutually insulated housing, whereby the lateral center-to-center distance between the two press-fit connectors may be reduced. More press-fit connectors can be mounted in a limited area on the printed circuit board. The fact that the press-fit contact tails extend from nearer to the clamping groove to both sides of the insulating housing may provide a prerequisite for two laterally adjacent press-fit connectors to be closer together.

The press-fit connector and the electronic system of some embodiments will be described in detail below with reference to the specific drawings. For clarity and conciseness of description, the vertical direction Z-Z, the longitudinal direction X-X and the transverse direction Y-Y are labeled in the figures. The vertical direction Z-Z, the longitudinal direction X-X and the transverse direction Y-Y may be perpendicular to each other. The vertical direction Z-Z generally refers to the height direction of the press-fit connector. The longitudinal direction X-X generally refers to the length direction of the press-fit connector. The transverse direction Y-Y generally refers to the width direction of the press-fit connector.

As shown in fig. 1-11, the press-fit connector 100 may include an insulative housing 200. Referring to fig. 8 and 11, the insulating housing 200 may have a mating face 201 and a mounting face 202. The abutment surface 201 and the mounting surface 202 may be disposed opposite in the vertical direction Z-Z. The abutment surface 201 may be provided with a clamping groove 210. Illustratively, the card slot 210 may be recessed from the interface 201 in a vertical direction Z-Z. Card slot 210 may be used to receive at least a portion of an add-on card, such as an edge of an add-on card, to retain the add-on card on insulative housing 200. The add-on card may be configured as a daughter card. The additional cards may include a video card, a memory card, or a sound card, etc. The insulating housing 200 may be molded from an insulating material such as plastic using a molding process. The insulating housing 200 is typically a single piece.

Illustratively, the insulating housing 200 may be substantially elongated in shape. The insulating housing 200 may extend in the longitudinal direction X-X. The card slot 210 may be in the form of an elongated card slot extending in the longitudinal direction X-X. The add-on card may be inserted into the card slot 210 through an opening of the card slot 210. The press-fit connector 100 may be mounted to a printed circuit board 900. The printed circuit board 900 may be configured as a motherboard.

The press-fit connector 100 may also include a plurality of conductive elements 300. A plurality of conductive elements 300 may be retained on the insulating housing 200. A plurality of conductive elements 300 may be held on the insulating housing 200 spaced apart from one another along the longitudinal direction X-X to ensure electrical insulation between adjacent conductive elements 300 from one another. The conductive elements 300 may be arranged in two columns on either side of the card slot 210, each column extending in the longitudinal direction X-X. Alternatively, the two columns of conductive elements 300 may be aligned with each other along the longitudinal direction X-X. Optionally, the two columns of conductive elements 300 are staggered in the longitudinal direction X-X to increase the spacing between the conductive elements 300, thereby reducing cross-talk. Typically, the two columns of conductive elements 300 have the same configuration, but are disposed in mirror image of each other. Of course, the conductive element 300 may be located on one side of the card slot 210, if desired.

The conductive element 300 may be made of a conductive material such as metal. Conductive element 300 may be generally an elongated unitary piece. As shown in connection with fig. 12-15, each conductive element 300 may include, along its extension, an electrical contact header 310 and a press-fit contact tail 320 at both ends of the conductive element 300, and an intermediate portion 330 connected between the electrical contact header 310 and the press-fit contact tail 320. The electrical contact header 310 may be located within the insulating housing 200. The electrical contact heads 310 may be located on the sides of the card slot 210. Typically, the electrical contact head 310 is bent generally toward the inside of the card slot 210 to protrude into the card slot 210. The electrical contact head 310 may include an electrical contact surface 311 located within the card slot 210. The add-on card may have a plurality of mating conductive elements thereon, such as gold fingers. When an add-on card is inserted into card slot 210, electrical contact surface 311 may make electrical contact with a mating conductive element on the add-on card, thereby making electrical connection of conductive element 300 with circuitry on the add-on card. The press-fit contact tail 320 may be bent out of the insulating housing 200 from the middle portion 330. The press-fit contact tail 320 may be used to press-fit with a contact pad 910 on the printed circuit board 900 to make an electrical connection with the contact pad 910. The press-fit contact tail 320 may include a press-fit surface 323 facing away from the opening of the card slot 210. When the conductive element 300 is press-fit with the printed circuit board 900, the press-fit surface 323 may be in electrical contact with the contact pads 910, thereby making electrical connection of the conductive element 300 with circuitry on the printed circuit board 900. In this manner, the add-on card may be electrically connected to the printed circuit board 900 by the press-fit connector 100.

The press-fit connector 100 may achieve a press-fit of the press-fit contact tail 320 of each conductive element 300 with the contact pad 910 on the printed circuit board 900 in any suitable manner. Illustratively, the press-fit connector 100 may be provided with any suitable mechanical connection structure, such as a snap-fit or a connector, by which the press-fit connector 100 may be connected to the printed circuit board 900. Preferably, such mechanical connection means include one or more of a snap-fit and a threaded connection to facilitate the user's self-installation of the press-fit connector 100 in the field. When the press-fit connector 100 is connected in place with the printed circuit board 900, the press-fit contact tail 320 of each conductive element 300 may deform to a degree that the press-fit contact tail 320 of each conductive element 300 may press-fit with the corresponding contact pad 910 on the printed circuit board 900 under the contact force (i.e., normal pressure) between the press-fit contact tail 320 and the contact pad 910.

In existing standard DDR5 card edge connectors, the conductive elements are typically soldered to the printed circuit board. Whereas the welding process is usually only completed in a few specific locations, e.g. factories, etc. Compared to existing card edge connectors, the press-fit connector 100 provided by the embodiments of the present disclosure can be easily mounted to the printed circuit board 900 or dismounted from the printed circuit board 900 at a user or in a factory. Thus, for example, the press-fit connector 100 is damaged by repeated insertion and removal for performance test of the add-on card, and the new press-fit connector 100 can be easily and conveniently replaced. In addition, the welding process is reduced, so that the manufacturing time is shortened, and the manufacturing cost is reduced.

Embodiments of the present disclosure also provide an electronic system. The electronic system may include a printed circuit board 900 and any of the press-fit connectors 100 according to embodiments of the present disclosure. In some embodiments, as shown in fig. 1-4, in embodiments where the conductive elements 300 are arranged in two columns on either side of the card slot 210, the printed circuit board 900 may be provided with two columns of contact pads 910 arranged in the longitudinal direction X-X. The press-fit contact tails 320 of the two rows of contact pads 910 and the plurality of conductive elements 300 may be press-fit in a one-to-one correspondence.

Desirably, the deformation that occurs when the press-fit contact tail 320 is press-fit with the contact pad 910 is resilient and returns to its original shape after the normal pressure is removed to avoid permanent yielding, which can allow a contact area between the press-fit contact tail 320 and the contact pad 910 to be sufficiently large to ensure a small contact resistance at the interface of the two, thereby improving signal integrity. One of the means employed is to manufacture these conductive elements from materials having a relatively high yield strength. However, a very important parameter, namely the resistivity of the material itself, must also be considered when selecting the material of the conductive element, and therefore the yield strength of the material itself from which the conductive element is made is limited by increasing. The inventors have appreciated and appreciated that by increasing the partial longitudinal width of the press-fit contact tail 320, the press-fit contact tail 320 may be subjected to a greater normal pressure such that the press-fit contact tail 320 is in full contact with the contact pad 910. Thus, a smaller contact resistance may be created at the interface between the press-fit contact tail 320 and the contact pad 910. The inventors have further appreciated and appreciated that in this manner, the press-fit connector is configured to achieve a contact resistance of about 50 ohms and a normal pressure of about 50gf (about equal to 0.5N).

As illustrated in fig. 9 and 12-15, at least one of the opposite sides of the press-fit contact tail 320 in the longitudinal direction X-X may be provided with a protruding wing 340, for example. Thereby, the longitudinal width of the press-fit contact tail 320 at the location of the wing 340 increases. The wings 340 may have any suitable shape, for example, as shown in the figures, the wings 340 may be generally rectangular. In addition, the wing 340 may have a regular shape such as triangle, arch or trapezoid; alternatively, the surface may have other irregular shapes such as saw teeth. The wing 340 may be provided on one of the sides of the press-fit contact tail 320 opposite in the longitudinal direction X-X, or the wing 340 may be provided on both sides. The wings 340 on each side may be one or more. In the case where the wing portions 340 are provided on both sides or a plurality of wing portions 340 are provided on one side, the shape of the wing portions 340 may be the same or different. The wings 340 may have the same or different dimensions even though the shapes are the same. The longitudinal width of the press-fit contact tail 320 may be increased by providing the wings 340, whereby the normal pressure exerted on the press-fit contact tail 320 may be appropriately increased without permanently deforming the press-fit contact tail 320, and the contact resistance at the interface may be reduced. In addition, the body resistance of the press-fit contact tail 320 can be adjusted by providing the wing 340, and impedance matching of the connector to the printed circuit board can also be achieved. The signals transmitted by the press-fit connector 100 employing such wings 340 have the desired signal integrity. The size of the wings 340 may be adjusted according to the desired signal integrity and normal pressure to meet the user's needs.

For example, as shown in fig. 12-15, the wing 340 can include a first wing 341 and a second wing 342. The first and second wing portions 341 and 342 may be disposed at both sides of the press-fit contact tail portion 320 in the longitudinal direction X-X. The shape and size of the first wing 341 and the second wing 342 can be the same or different. In any case, the wings 340 tend to be evenly distributed on both sides of the press-fit contact tail 320. 12-15, the first and second wings 341 and 342 are symmetrically disposed on both sides of the press-fit contact tail 320 in the longitudinal direction X-X. Of course, the wings 340 may also be provided on both sides of the press-fit contact tail 320 in an asymmetric fashion. In the illustrated embodiment, the number of first wing portions 341 and second wing portions 342 is one. In other embodiments not shown, the number of first wing portions 341 and second wing portions 342 may be plural. Providing the wings 340 on both sides of the press-fit contact tail 320 in the longitudinal direction X-X may relatively further increase the longitudinal width of the press-fit contact tail 320 and may uniformly bear normal pressure on both sides of the press-fit contact tail 320, as compared to providing the wings 340 on only one side, thereby enabling the press-fit connector 100 to further meet signal integrity requirements.

12-15, the press-fit contact tail 320 may include oppositely disposed root 321 and tip 322 ends along its extension. Root 321 may be connected to intermediate portion 330. The distance from the wing 340 to the root 321 may be less than the distance to the tip 322. The wing 340 being closer to the root 321 may cause the press-fit contact tail 320 to bear a greater normal pressure at a location closer to the intermediate portion 330, which may increase the ability of the press-fit contact tail 320 to resist permanent yielding. In addition, a premise may be provided that the contact pads 910 on the printed circuit board 900 that make electrical contact with the press-fit contact tail 320 are closer to the center of the insulating housing 200 in the lateral direction Y-Y (as will be further described below). For example, as shown in fig. 15, the middle portion 330 may extend in the vertical direction Z-Z. The distance a from the wing 340 to the middle 330 in the transverse direction Y-Y may be between about 0.3mm and 0.5 mm. Further, the distance a may be between about 0.35mm and about 0.4 mm. Illustratively, as shown in FIG. 15, the dimension C of the press-fit contact tail 320 may be between about 2.4mm and 2.8mm in the transverse direction Y-Y. Further, the dimension C may be between about 2.5mm and about 2.7 mm.

Illustratively, a press-fit surface 323 of the press-fit contact tail 320 may be located between the wing 340 and the tip 322. The wing 340 may have a back face 343 facing the printed circuit board 900. The back face 343 may be higher than the press-fit surface 323. When the conductive element 300 is press-fit with the printed circuit board 900, the press-fit surface 323 may be electrically connected with the contact pad 910, while the wing 340 is not electrically connected with the contact pad 910. The portion of the press-fit contact tail 320 where the wing 340 is located may have a relatively large stiffness so that it can withstand a large normal pressure, while the portion of the press-fit contact tail 320 where the press-fit surface 323 is located may have a relatively narrow longitudinal width and relatively large elasticity so that the press-fit surface 323 can very closely conform to the contact pad 910, thereby reliably ensuring a desired suitable contact area between the press-fit contact tail 320 and the contact pad 910, thereby improving signal integrity.

12-15, the press-fit contact tail 320 may be connected to a middle portion of the middle portion 330 along the longitudinal direction X-X. The middle portion 330 may extend beyond the press-fit contact tail 320 toward both sides in the longitudinal direction X-X. The wing 340 does not extend beyond the middle portion 330 in the longitudinal direction X-X. So configured, the wings 340 do not cause adjacent conductive elements 300 to electrically contact to ensure that adjacent conductive elements 300 are electrically isolated from each other. Even if the press-fit contact tail 320 is deformed, particularly the root end 321 thereof, for installation and/or transportation, etc., electrical contact between the wings 340 on adjacent press-fit contact tails 320 is not caused.

Illustratively, as shown in fig. 15, the thickness T1 of the intermediate portion 330 may be greater than the thickness T2 of the press-fit contact tail 320. As such, the intermediate portion 330 may have sufficient mechanical strength that during assembly of the press-fit connector 100, as shown in fig. 11, the intermediate portion 330 may be successfully inserted into the channel 250 in the insulating housing 200, as shown in fig. 2, and interference fit within the channel 250 by barbs 331 thereon (as shown in fig. 12-13). In addition, as shown in fig. 2-3, when the add-on card is inserted into the card slot 210 of the press-fit connector 100, the electrical contact surfaces 311 on the electrical contact header 310 make electrical contact with the mating conductive elements on the add-on card, which will press the electrical contact header 310 to bend toward both sides in the lateral direction Y-Y, the intermediate portion 330 can ensure that the electrical contact header 310 has sufficient elasticity and provide a sufficient clamping force for the add-on card. Thus, the thickness T1 of the intermediate portion 330 may be greater than the thickness T2 of the press-fit contact tail 320. A smaller thickness T2 of the press-fit contact tail 320 may improve the permanent yield of the press-fit contact tail 320. Illustratively, as shown in FIG. 15, the thickness T1 of the intermediate portion 330 may be between approximately 0.2mm and 0.3 mm. Further, the thickness T1 may be between about 0.23mm and about 0.27 mm. Further, the thickness T1 may be 0.25mm. Illustratively, the thickness T2 of the press-fit contact tail 320 may be between about 0.18mm and about 0.22 mm. Further, the thickness T2 may be between about 0.19mm and about 0.21 mm. Further, the thickness T2 may be 0.2mm. In this way, the press-fit contact tail 320 may have good resiliency for press-fitting with the contact pad 910 on the printed circuit board 900.

Illustratively, the wear resistance of the electrical contact surface 311 may be improved by varying the plating and/or material, etc. of the electrical contact surface 311 of the electrical contact head 310. In this way, the mating conductive elements of the add-on card wear less on the electrical contact surface 311. The number of pluggable times of the press-fit connector 100 can be increased.

Illustratively, as shown in fig. 14, the distance B of the electrical contact surface 311 to the intermediate portion 330 may be less than or equal to 0.5mm. Further, the distance B may be approximately between 0.4mm and 0.5mm. Still further, the distance B may be 0.43mm-0.47mm. Shortening distance B may bring conductive element 300 closer to the middle of press-fit connector 100 in lateral direction Y-Y. Accordingly, contact pads 910 on the printed circuit board 900 that connect two columns of conductive elements 300 of the same press-fit connector 100 may be closer to each other. Thus, the wing 340 may be located closer to the middle of the press-fit connector 100, i.e., closer to the center of force when the add-on card is inserted and removed, to better share the external forces experienced by the press-fit contact tail 320 of the conductive element 300 when the add-on card is inserted and removed. Illustratively, as shown in FIG. 4, the pitch P1 between the opposing ends 911 of the two rows of contact pads 910 may be between about 2.4mm and 3.2mm in the lateral direction Y-Y. Further, the pitch P1 may be between about 2.6mm and about 3.0mm. Still further, the pitch P1 may be 2.8-3.0mm. Too small a pitch P1 may result in crosstalk between two adjacent columns of conductive elements 300 in the lateral direction Y-Y. Too large a pitch P1 may result in too much space being occupied by the two rows of contact pads 910, resulting in lower utilization of the printed circuit board 900. And the distance B from the electrical contact surface 311 to the middle portion 330 may be less than or equal to 0.5mm, a sufficient spacing between the two rows of contact pads 910 on the adjacent two press-fit connectors 100 and 100' may be ensured to reduce end crosstalk when the plurality of press-fit connectors 100 are closely aligned along the transverse direction Y-Y, as shown in fig. 6. Illustratively, as shown in FIG. 4, the pitch P2 between the opposite ends 912 of the two rows of contact pads 910 may be between about 6.6mm and 7.2mm in the lateral direction Y-Y. Further, the pitch P2 may be between about 6.7mm and 7.0 mm. Still further, the pitch P2 may be 6.7-6.9mm. In addition, where the distance B from the electrical contact surface 311 to the intermediate portion 330 may be less than or equal to 0.5mm, the lateral dimensions of each of the two rows of contact pads 910 may be made slightly larger, which may result in a larger contact area between the press-fit contact tail 320 and the corresponding contact pad 910, thereby reducing the contact resistance therebetween and improving signal integrity. For the press-fit connector 100, the lateral dimension of each contact pad 910 may be up to about 2mm. In this way, the lateral dimensions of the wing 340 can be made large enough to meet the requirements for DDR5 contact resistance in the JEDEC standard.

2-3, the insulating housing 200 may have opposite first 221 and second 222 sides along the transverse direction Y-Y. At least one pair of mounting portions 230 may be provided on the first side 221 and the second side 222. Each of the at least one pair of mounting portions 230 may include a mounting protrusion 231 and a mounting groove 232. The mounting projection 231 and the mounting groove 232 may be provided on different sides. That is, with respect to the pair of mounting portions 230, when the mounting projection 231 is provided on the first side 221, the mounting groove 232 may be provided on the second side 222; conversely, when the mounting projection 231 is disposed on the second side 222, the mounting groove 232 may be disposed on the first side 221.

The mounting protrusion 231 and the mounting groove 232 in each of the at least one pair of mounting portions 230 may be adapted in shape. The mounting projections 231 and the mounting recesses 232 in each of the at least one pair of mounting portions 230 may be aligned in the transverse direction Y-Y. So configured, when a plurality of press-fit connectors 100 are mounted on the printed circuit board 900 in the lateral direction Y-Y, as shown in fig. 6, the mounting projections 231 and the mounting grooves 232 of the adjacent press-fit connectors 100 can be fitted. Specifically, the mounting protrusion 231 of one of the adjacent press-fit connectors 100 may be inserted into the mounting groove 232 of the other of the adjacent press-fit connectors 100. Once one press-fit connector 100 is accurately fixed to the printed circuit board, as shown in fig. 6, the mounting projection 231 of one side of the press-fit connector 100 may be complementary in shape to the mounting recess 232 'of the adjacent press-fit connector 100'; alternatively, the mounting groove 232 on one side of the press-fit connector 100 may be complementary in shape to the mounting protrusion 231 'on the adjacent press-fit connector 100'. So configured, the press-fit connector 100 can provide a positioning function for the press-fit connector 100'. Also, the mounting bosses 231 and 231' do not occupy additional space on the printed circuit board. In this way, the space occupied by each press-fit connector 100 can be reduced, reducing the lateral center-to-center distance between adjacent press-fit connectors. Also, the mounting projections 231 and the mounting recesses 232 included in each pair of the mounting portions 230 may be aligned in the lateral direction Y-Y such that the press-fit connectors 100 and the insulating housings of the press-fit connectors 100' have the same outer shape, that is, the same plurality of press-fit connectors may be rearranged without preparing two types of press-fit connectors.

Illustratively, as shown in fig. 10, the mounting boss 231 may be provided with a through hole 233 penetrating in the vertical direction Z-Z. The press-fit connector 100 may also include a connector (not shown) such as a screw. The connection member may pass through the through-hole 233 to be connected to the printed circuit board 900. In this manner, a press fit of the press-fit connector 100 with the printed circuit board 900 may be achieved.

Illustratively, as shown in fig. 5, a plurality of pairs of mounting portions 230 may be provided on the first side 221 and the second side 222, and the plurality of pairs of mounting portions 230 may be spaced apart in the longitudinal direction X-X. The mounting parts 230 of adjacent two pairs of the mounting parts 230 on the same side may include one mounting protrusion 231 and one mounting groove 232. That is, on the first side 221 and the second side 222, the mounting projections 231 and the mounting grooves 232 are alternately distributed in the longitudinal direction X-X. In this way, it is possible to secure the mounting projections 231 for securing on each side of the insulating housing 200, and thus to perform a good positioning function for the press-fit connector 100.

Illustratively, as shown in fig. 5, three pairs of mounting portions 230 may be provided on the first side 221 and the second side 222. The three pairs of mounting portions 230 may be distributed along the longitudinal direction X-X. For each press-fit connector 100, a triangular positioning may be formed by three mounting projections 231 in three pairs of mounting portions 230, ensuring a firm connection between the press-fit connector 100 and the printed circuit board.

Illustratively, as shown in FIG. 10, a spacer rib 240 may be disposed within the card slot 210. The partition rib 240 may divide the card slot 210 into a plurality of independent sections in the longitudinal direction X-X. The partition rib 240 may not only increase the mechanical strength of the card slot 210, but also have a foolproof function by disposing the partition rib 240 at a non-center position of the card slot 210.

Illustratively, as shown in fig. 10, the press-fit connector 100 may further include a reinforcing member 400. The reinforcing member 400 may cover the partition rib 240, thereby protecting the partition rib 240. The reinforcing member 400 may be made of a stronger material such as plastic, ceramic, metal, etc. Preferably, the reinforcing member 400 may be made of a metal material. The strength of the metal material is high, and the material and processing cost is low. Preferably, the reinforcing member 400 is an integral sheet metal part. Thus, the strength of the reinforcing member 400 is high, and the processing process is simple and the cost is low.

Thus, the present disclosure has been described in terms of several embodiments, but it will be appreciated that numerous variations, modifications, and improvements will readily occur to those skilled in the art in light of the teachings of the present disclosure, and are within the spirit and scope of the disclosure as claimed. The scope of the disclosure is defined by the appended claims and equivalents thereof. The foregoing embodiments are provided for the purpose of illustration and description only and are not intended to limit the disclosure to the embodiments described.

Various changes may be made to the structures illustrated and described herein. For example, the press-fit connector described above may be any suitable connector, such as a card edge connector, a backplane connector, a daughter card connector, a stacked connector (stacking connector), a mezzanine connector (mezzanine connector), an I/O connector, a chip socket, a Gen Z connector, and the like.

While many inventive aspects are described above with reference to vertical connectors, it should be understood that aspects of the present disclosure are not limited thereto. As such, any one of the inventive features, either alone or in combination with one or more other inventive features, may also be used with other types of connectors, such as right angle connectors, coplanar connectors, and the like.

In the description of the present disclosure, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front", "rear", "upper", "lower", "left", "right", "transverse", "vertical", "horizontal", "top", "bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present disclosure and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be configured and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present disclosure; the orientation terms "inner" and "outer" refer to the inner and outer relative to the outline of the components themselves.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one or more components or features' spatial positional relationships to other components or features as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass not only the orientation of the elements in the figures but also different orientations in use or operation. For example, if the element in the figures is turned over entirely, elements "over" or "on" other elements or features would then be included in cases where the element is "under" or "beneath" the other elements or features. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". Moreover, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and all such cases are intended to be encompassed herein.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, components, assemblies, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein.

Claims (19)

1. A press-fit connector, comprising:

the insulation shell is provided with a clamping groove which extends along the longitudinal direction and is recessed along the vertical direction; and

a plurality of conductive elements retained on the insulative housing, each of the plurality of conductive elements including an electrical contact header, a press-fit contact tail, and an intermediate portion connected between the electrical contact header and the press-fit contact tail, the electrical contact header being bent into the card slot, the electrical contact header including an electrical contact surface within the card slot,

the press-fit contact tail is bent from the intermediate portion to outside the insulating housing, the press-fit contact tail including a press-fit surface facing away from the opening of the card slot.

2. The press-fit connector according to claim 1, wherein at least one of two opposite sides of the press-fit contact tail portion in the longitudinal direction is provided with a protruding wing portion.

3. The press-fit connector of claim 2, wherein the wings comprise first and second wings disposed on the two sides of the press-fit contact tail.

4. The press-fit connector of claim 3, wherein the first and second wings are symmetrically disposed on the two sides of the press-fit contact tail.

5. The press-fit connector of claim 2, wherein the press-fit contact tail includes a root end connected to the intermediate portion and a tip end opposite the root end, the wing portion being less distant from the root end than from the tip end.

6. The press-fit connector of claim 5, wherein the press-fit surface is located between the wing and the tip.

7. The press-fit connector according to claim 2, wherein the press-fit contact tail portion is connected to a middle portion of the intermediate portion in the longitudinal direction,

The middle part extends beyond the press-fit contact tail parts towards two sides along the longitudinal direction, and

the wing portions do not exceed the intermediate portion in the longitudinal direction.

8. The press-fit connector of claim 2, wherein the intermediate portion extends in the vertical direction and the wing portion is between 0.3mm and 0.5mm from the intermediate portion in a transverse direction perpendicular to the longitudinal direction and the vertical direction.

9. The press-fit connector according to claim 1, wherein the intermediate portion extends in the vertical direction, and the distance of the electrical contact surface from the intermediate portion is less than or equal to 0.5mm.

10. The press-fit connector of claim 1, wherein the press-fit contact tail has a dimension of between 2.4mm and 2.8mm in a transverse direction perpendicular to the longitudinal direction and the vertical direction.

11. The press-fit connector of claim 1, wherein the thickness of the intermediate portion is greater than the thickness of the press-fit contact tail portion.

12. The press-fit connector of claim 11, wherein the thickness of the intermediate portion is between 0.2mm and 0.3 mm.

13. The press-fit connector of claim 11, wherein the thickness of the press-fit contact tail is between 0.18mm and 0.22 mm.

14. A press-fit connector, comprising:

an insulating housing provided with a clamping groove extending in the longitudinal direction; and

a plurality of conductive elements retained on the insulative housing, each of the plurality of conductive elements including an electrical contact header, a press-fit contact tail, and an intermediate portion connected between the electrical contact header and the press-fit contact tail, the electrical contact header being bent into the card slot, the press-fit contact tail being bent from the intermediate portion out of the insulative housing,

along the transverse direction perpendicular to the longitudinal direction, the insulating housing has opposite first and second sides, the first and second sides are provided with at least one pair of mounting portions, each of the at least one pair of mounting portions includes a mounting protrusion and a mounting groove provided on different sides, the mounting protrusion and the mounting groove in each of the at least one pair of mounting portions are matched in shape, and the mounting protrusion and the mounting groove in each of the at least one pair of mounting portions are aligned along the transverse direction.

15. The press-fit connector according to claim 14, wherein a plurality of pairs of mounting portions are provided on the first side surface and the second side surface, the pairs of mounting portions being spaced apart along the longitudinal direction,

the mounting portions of two adjacent pairs of mounting portions on the same side face include a mounting projection and a mounting groove.

16. The press-fit connector according to claim 14, wherein three pairs of mounting portions are provided on the first side and the second side.

17. An electronic system comprising a printed circuit board and a press-fit connector,

the press-fit connector includes:

an insulating housing provided with a clamping groove extending in the longitudinal direction; and

a plurality of conductive elements retained on the insulating housing, each of the plurality of conductive elements having a press-fit contact tail extending out of the insulating housing,

the printed circuit board is provided with two rows of contact plates arranged along the longitudinal direction, the conductive elements are arranged on two sides of the clamping groove to form two rows extending along the longitudinal direction, and the two rows of contact plates are in press fit with the press fit contact tail parts of the conductive elements in a one-to-one correspondence manner.

18. The electronic system of claim 17, wherein a spacing between opposite ends of the two rows of contact pads is between 2.4mm and 3.2mm in a transverse direction perpendicular to the longitudinal direction.

19. The electronic system of claim 17, wherein a spacing between opposite ends of the two rows of contact pads is between 6.6mm and 7.2mm in a transverse direction perpendicular to the longitudinal direction.