Card edge connector

Abstract

A card edge connector (100) includes a housing (110) having a card slot (114) at a mating end, the card slot (114) receiving a card edge (54) of a circuit card (52). The card edge connector includes a contact assembly (150) having first and second contact subassemblies (200, 300), each contact subassembly (200, 300) including a contact (210, 310) held by a contact holder (230, 330), the contact holder (230, 330) including signal contacts (214, 314) arranged in pairs (216, 316) and ground contacts (216, 316) located between the pairs. The contact subassembly includes a shielding structure (250, 350) coupled to the ground contact. The shielding structure and the ground contact provide circumferential shielding around each pair of signal contacts by the contact holder.

Description

Technical Field

[0001] This article generally deals with card edge connectors. Background Technology

[0002] Electrical connectors are used in communication systems to electrically connect various components of the system. Some known electrical connectors are used for direct connection between a first circuit board and a second circuit board. For example, an electrical connector can be a card edge connector, which is mounted to a first circuit board and has a slot that receives an edge portion of a second circuit board. The contacts of the card edge connector electrically connect the first circuit board to the second circuit board. Card edge connectors typically include multiple contacts arranged in rows on opposite sides of the slot. Card edge connectors have a high contact density, positioning the contacts close to each other. As data rates increase, signal integrity can degrade due to a lack of effective electrical shielding. Known card edge connectors utilize ground contacts between corresponding signal contacts to provide shielding between signal contacts. However, at high data rates, the shielding provided by the ground contacts may be ineffective.

[0003] There is still a need for a card edge connector with improved electrical shielding for improved signal integrity, especially at high data rates. Summary of the Invention

[0004] According to the present invention, a card edge connector is provided, comprising a housing including a chamber and a card slot at a mating end of the housing, the card slot being configured to receive a card edge of a circuit card. The card edge connector includes a contact assembly received in the chamber for connection to a card edge inserted into the card slot. The contact assembly includes a first contact subassembly and a second contact subassembly. The first contact subassembly includes an array of first contacts held by a first contact holder. The first contacts pass through the first contact holder. The first contacts include a first ground contact and a first signal contact. The first signal contacts are arranged in pairs. A first ground contact is located between the pairs of first signal contacts. The first contact subassembly includes a first shielding structure coupled to the first ground contact. The first shielding structure and the first ground contact provide circumferential shielding around each pair of first signal contacts via the first contact holder. The second contact subassembly includes an array of second contacts held by a second contact holder. The second contacts pass through the second contact holder. The second contacts include a second ground contact and a second signal contact. The second signal contacts are arranged in pairs. The second grounding contact is located between the pair of second signal contacts. The second contact subassembly includes a second shielding structure coupled to the second grounding contact. The second shielding structure and the second grounding contact provide circumferential shielding around each pair of second signal contacts via a second contact retainer. Attached Figure Description

[0005] Figure 1 This is a perspective view of a communication system according to an exemplary embodiment.

[0006] Figure 2 This is a perspective view of a contact assembly according to an exemplary embodiment.

[0007] Figure 3 This is a perspective view of the first inner shield of the first contact subassembly according to an exemplary embodiment.

[0008] Figure 4 This is a perspective view of the first outer shield of the first contact subassembly according to an exemplary embodiment.

[0009] Figure 5 This is a perspective view of a portion of the first contact sub-assembly according to an exemplary embodiment.

[0010] Figure 6 This is a perspective view of the inside of the first contact sub-assembly according to an exemplary embodiment.

[0011] Figure 7 This is a perspective view of the outer side of the first contact sub-assembly according to an exemplary embodiment.

[0012] Figure 8 This is a perspective view of the second inner shield of the second contact subassembly according to an exemplary embodiment.

[0013] Figure 9 This is a perspective view of the second outer shield of the second contact subassembly according to an exemplary embodiment.

[0014] Figure 10 This is a perspective view of a portion of the second contact sub-assembly according to an exemplary embodiment.

[0015] Figure 11 This is a perspective view of the inside of the second contact sub-assembly according to an exemplary embodiment.

[0016] Figure 12 This is a perspective view of the outer side of the second contact sub-assembly according to an exemplary embodiment.

[0017] Figure 13 This is a cross-sectional view of a card edge connector according to an exemplary embodiment.

[0018] Figure 14 This is a cross-sectional view of a portion of a card edge connector according to an exemplary embodiment, showing the contact assembly within the housing chamber. Detailed Implementation

[0019] Figure 1This is a perspective view of a communication system 10 according to an exemplary embodiment. The communication system 10 includes a card edge connector 100 configured to be electrically connected to a pluggable module 50. The pluggable module 50 is configured to be inserted into a mating end of the card edge connector 100. In an exemplary embodiment, the card edge connector 100 is configured to be mounted to a main circuit board 20 of the communication system 10. For example, the card edge connector 100 may be mounted to the top side of the main circuit board 20. In an alternative embodiment, the card edge connector 100 may be a cable connector disposed at the end of one or more cables (not shown).

[0020] The pluggable module 50 includes a circuit card 52 configured to insert into a card edge connector 100. The circuit card 52 includes a card edge 54 having card contacts 56 adjacent to it. Card contacts 56 may be positioned along both sides of the circuit card 52 adjacent to the card edge 54. The card edge 54 is configured to insert into a slot at a mating end of the card edge connector 100. The pluggable module 50 may include a housing or enclosure surrounding the circuit card 52, configured to mate with the card edge connector 100. The pluggable module 50 may include securing features, such as latching features configured to secure to the card edge connector 100. In the illustrated embodiment, the circuit card 52 is configured to be plugged into the card edge connector 100 in a direction orthogonal (e.g., perpendicular) to the main circuit board 20. For example, the circuit card 52 may be vertically oriented, while the main circuit board 20 may be horizontally oriented. In alternative embodiments, other orientations are possible. For example, the card edge connector 100 can be a right-angle connector, so that the circuit card 52 can be inserted into the card edge connector 100 in a direction that is generally parallel to the main circuit board 20.

[0021] The card edge connector 100 includes a housing 110 having a cavity 112 that holds one or more contact assemblies 150, such as four contact assemblies 150 stacked side-by-side in the cavity 112. In an exemplary embodiment, the housing 110 is made of a dielectric material, such as a plastic material. The housing 110 may be injection molded. Alternatively, the housing 110 may be made of multiple parts, such as an outer housing and an inner housing received within the outer housing.

[0022] The housing 110 includes a slot 114 at the mating end of the card edge connector 100. In the illustrated embodiment, the slot 114 is located at the top 116 of the housing 110. In alternative embodiments, other locations are also possible. In an exemplary embodiment, the bottom 118 of the housing 110 is configured to be mounted to the main circuit board 20. The housing 110 includes a front portion 120 and a rear portion 122. The housing 110 includes a first side 124 and a second side 126. In an exemplary embodiment, the housing 110 extends between the sides 124 and 126. For example, the front portion 120 and the rear portion 122 are longer than the first side 124 and the second side 126. In the illustrated embodiment, the housing 110 is generally rectangular. However, in alternative embodiments, the housing 110 may have other shapes. The housing 110 may include securing features, such as a latch, for securing the circuit card 52 in the slot 114.

[0023] Figure 2 This is a perspective view of a contact assembly 150 according to an exemplary embodiment. The contact assembly 150 includes a plurality of contacts 152 configured to be electrically connected to a pluggable module 50. For example, when a circuit card 52 is inserted into a card edge connector 100, the contacts 152 may be electrically connected to corresponding card contacts 56 of the circuit card 52. In an exemplary embodiment, the contacts 152 are arranged in multiple rows on opposite sides of a card space 154 configured to mate with the opposite side of the circuit card 52. The circuit card 52 is configured to be inserted into the card space 154 between rows of contacts 152. The mating ends of the contacts 152 form separable mating interfaces configured to mate with card contacts 56. For example, the mating ends of the contacts 152 may include spring beams configured to mate with card contacts 56. In an exemplary embodiment, the contacts 152 are configured to terminate to a main circuit board 20. For example, the ends of the contacts 152 may be soldered to the main circuit board 20.

[0024] In an exemplary embodiment, the contact assembly 150 includes a first contact sub-assembly 200 and a second contact sub-assembly 300 located on opposite sides of the contact assembly 150. The first contact assembly 200 and the second contact assembly 300 may be similar to each other, for example, mirror versions of each other and inverted 180° on opposite sides of the contact assembly 150. Components of the first contact sub-assembly 200 may be identified or represented using the indicator “first” and / or reference numerals “2**”, and components of the second contact sub-assembly 300 may be identified or represented using the indicator “second” and / or reference numerals “3**”, to distinguish / identify the various components.

[0025] In an exemplary embodiment, the contact assembly 150 includes a contact spacer 160 positioned between a first contact assembly 200 and a second contact assembly 300. The contact spacer 160 maintains the relative position of the first contact assembly 200 and the second contact assembly 300 to control the spacing of contacts 152 in rows on opposite sides of the card space 154. The contact spacer 160 may be a molded component, such as an injection-molded component. The contact spacer 160 extends between a first side 162 and a second side 164. A first contact subassembly 200 is coupled to the first side 162. A second contact subassembly 300 is coupled to the second side 164. The contact spacer 160 has a thickness between the first side 162 and the second side 164. The thickness is selected to control the spacing between the first contact assembly 200 and the second contact assembly 300, for example, to control the width of the card space 154.

[0026] The first contact subassembly 200 includes an array 202 of first contacts 210 held by a first contact holder 230. The first contacts 210 pass through the first contact holder 230. The first contact holder 230 maintains the relative position of the first contacts 210. In an exemplary embodiment, the first contact 210 includes a first ground contact 212 and a first signal contact 214. The first signal contacts 214 are arranged in pairs 216. The first ground contact 212 is located between the pairs 216 of the first signal contacts 214. The first contact subassembly 200 includes a first shielding structure 250 coupled to the first ground contact 212. The first shielding structure 250 and the first ground contact 212 provide circumferential shielding around each pair of first signal contacts 214 via the first contact holder 230.

[0027] In an exemplary embodiment, the first shielding structure 250 is a multi-piece shielding structure. For example, the first shielding structure 250 includes a first inner shield 260 extending along the inside of the first contact holder 230 and a first outer shield 280 extending along the outside of the first contact holder 230. The inner shield 260 and the outer shield 280 provide shielding along opposite sides of the first signal contact 214. The inner shield 260 and the outer shield 280 are electrically connected to each of the first ground contacts 212 so that the first shielding structure 250 and the first ground contacts 212 are electrically shared. In an exemplary embodiment, the first shielding structure 250 is electrically connected to the main circuit board 20 independently of the first ground contacts 212, for example, electrically connected to the ground plane of the main circuit board 20.

[0028] The second contact subassembly 300 includes an array 302 of second contacts 310 held by a second contact holder 330. The second contacts 310 pass through the second contact holder 330. The second contact holder 330 maintains the relative position of the second contacts 310. In an exemplary embodiment, the second contacts 310 include a second ground contact 312 and a second signal contact 314. The second signal contacts 314 are arranged in pairs 316. The second ground contact 312 is located between the pairs 316 of the second signal contacts 314. The second contact subassembly 300 includes a second shielding structure 350 coupled to the second ground contact 312. The second shielding structure 350 and the second ground contact 312 provide circumferential shielding around each pair of second signal contacts 314 via the second contact holder 330.

[0029] In an exemplary embodiment, the second shielding structure 350 is a multi-piece shielding structure. For example, the second shielding structure 350 includes a second inner shielding member 360 extending along the inside of the second contact holder 330 and a second outer shielding member 380 extending along the outside of the second contact holder 330. The inner shielding member 360 and the outer shielding member 380 provide shielding along opposite sides of the second signal contact 314. The inner shielding member 360 and the outer shielding member 380 are electrically connected to each second ground contact 312 so that the second shielding structure 350 and the second ground contact 312 are electrically shared. In an exemplary embodiment, the second shielding structure 350 is electrically connected to the main circuit board 30 independently of the second ground contact 312, for example, electrically connected to the ground plane of the main circuit board 30.

[0030] Figure 3 This is a perspective view of the first inner shield 260 of the first contact sub-assembly 200 according to an exemplary embodiment. Second contact assembly 300 ( Figure 2 The second inner shield 360 may be similar to the first inner shield 260, and similar components may be identified by similar reference numerals.

[0031] The inner shield 260 includes a panel 262 with a series of recesses 264 formed between a first end 265 and a second end 266. The inner shield 260 includes a first side surface 267 and a second side surface 268. The first side surface 267 is configured to face the inside of the first contact holder 230. In an exemplary embodiment, the panel 262 of the inner shield 260 is formed by stamping a sheet of metal. For example, the panel 262 may be formed by stamping a sheet of copper or aluminum. The panel 262 is conductive to provide electrical shielding for the first signal contact 214. The recesses 264 are configured to receive corresponding first signal contacts 214. For example, the recesses 264 may be sized to receive a pair of first signal contacts 214 and / or the portion of the contact holder 230 surrounding the pair of first signal contacts 214.

[0032] In an exemplary embodiment, the inner shield 260 is non-planar. For example, the inner shield 260 includes undulations forming a recess 264. In an exemplary embodiment, the inner shield 260 includes a series of covers 270 and connecting walls 272 between the covers 270. The connecting walls 272 are configured to connect to corresponding grounding contacts 212. For example, the connecting walls 272 may be joined by fusion welding, brazing, or through a compression interface or using conductive adhesive or conductive epoxy. The connecting walls 272 are coplanar with each other along a first side surface 267 of the inner shield 260. The inner shield 260 is electrically connected to each of the grounding contacts 212 at the corresponding connecting walls 272. In various embodiments, the connecting walls 272 include openings 271. The openings 271 are configured to receive portions of the contact holder 230.

[0033] Cover 270 forms a recess 264. Cover 270 extends to a second side 268 of inner shield 260. In an exemplary embodiment, each cover 270 includes an end wall 274 and side walls 273, 275 extending from opposite sides of the end wall 274. End wall 274 and side walls 273, 275 define corresponding recesses 264. End wall 274 may be generally planar. Optionally, each of the end walls 274 is coplanar with each other. In various other embodiments, end wall 274 may be nonplanar, for example, including curved or angled surfaces. Side walls 273, 275 extend between end wall 274 and corresponding connecting wall 272. Side walls 273, 275 may be oriented generally perpendicular to end wall 274 and / or connecting wall 272. In other embodiments, side walls 273, 275 may be angled, for example, at an angle between 90° and 160° relative to end wall 274. The lengths of the sidewalls 273 and 275 determine the depth of the recess 264. The opening 271 may extend into the sidewalls 273 and 275 and / or the end wall 274. In an exemplary embodiment, one or more of the end walls 274 include an alignment opening 276 for aligning the inner shield 260 to the contact holder 230 and / or receiving a connecting post for connecting the contact holder 230 and the contact spacer 160.

[0034] In an exemplary embodiment, the inner shield 260 includes a termination element 278 extending from the bottom of the panel 262. The termination element 278 is used to directly electrically connect the inner shield 260 to the main circuit board 20. Figure 1Termination element 278, for example, is independent of the grounding contact. For instance, termination element 278 includes a post or pin configured to receive in a plated through-hole of the main circuit board 20. Termination element 278 is configured to be soldered to the plated through-hole of the main circuit board 20. Termination element 278 defines a direct electrical path between the inner shield 260 and the main circuit board 20, such as to the ground plane of the main circuit board 20. Termination element 278 provides a grounding path to the main circuit board 20 independently of the grounding contact 212. In the illustrated embodiment, termination element 278 extends from connection wall 272. Optionally, each connection wall 272 may include a corresponding termination element 278. In alternative embodiments, termination element 278 may additionally or alternatively extend from end wall 274.

[0035] Figure 4 This is a perspective view of the first outer shield 280 of the first contact sub-assembly 200 according to an exemplary embodiment. Second contact assembly 300 ( Figure 2 The second outer shield 380 may be similar to the first outer shield 280, and similar components may be identified by similar reference numerals.

[0036] The outer shield 280 includes a panel 282, which forms a series of recesses 284 between a first end 285 and a second end 286. The outer shield 280 includes a first side surface 287 and a second side surface 288. The first side surface 287 is configured to face the inner side of the first contact holder 230. In an exemplary embodiment, the panel 282 of the outer shield 280 is formed by stamping a sheet of metal. For example, the panel 282 may be formed by stamping a sheet of copper or aluminum. The panel 282 is conductive to provide electrical shielding for the first signal contact 214. The recesses 284 are configured to receive corresponding first signal contacts 214. For example, the recesses 284 may be sized to receive a pair of first signal contacts 214 and / or the portion of the contact holder 230 surrounding the pair of first signal contacts 214.

[0037] In an exemplary embodiment, the outer shield 280 is non-planar. For example, the outer shield 280 includes undulations forming a recess 284. In an exemplary embodiment, the outer shield 280 includes a series of covers 290 and connecting walls 292 between the covers 290. The connecting walls 292 are configured to connect to corresponding grounding contacts 212. For example, the connecting walls 292 may be joined by fusion welding, brazing, or by compression interface or using conductive adhesive or conductive epoxy. The connecting walls 292 are coplanar with each other along a first side 287 of the outer shield 280. The outer shield 280 is electrically connected to each of the grounding contacts 212 at the corresponding connecting walls 292. In various embodiments, the connecting walls 292 include openings 291. The openings 291 are configured to receive portions of the contact holder 230.

[0038] Cover 290 forms a recess 284. Cover 290 extends to a second side 288 of outer shield 280. In an exemplary embodiment, each cover 290 includes an end wall 294 and side walls 293, 295 extending from opposite sides of the end wall 294. End wall 294 and side walls 293, 295 define corresponding recesses 284. End wall 294 may be generally planar. Optionally, each of the end walls 294 is coplanar with each other. In various other embodiments, end wall 294 may be nonplanar, for example, including curved or angled surfaces. Side walls 293, 295 extend between end wall 294 and corresponding connecting wall 292. Side walls 293, 295 may be oriented generally perpendicular to end wall 294 and / or connecting wall 292. In other embodiments, side walls 293, 295 may be angled, for example, at an angle between 90° and 160° relative to end wall 294. The lengths of the sidewalls 293 and 295 determine the depth of the recess 284. The opening 291 may extend into the sidewalls 293 and 295 and / or the endwall 294.

[0039] Figure 5 This is a perspective view of a portion of the first contact sub-assembly 200 according to an exemplary embodiment. Figure 5 The first contact subassembly 200 is shown, wherein the outer shield 280 ( Figure 4 The first contact subassembly 200 is removed to show the components of the first contact subassembly 200.

[0040] The first contact subassembly 200 includes first contacts 210 held in a row by a first contact holder 230. The first contacts 210 include a first ground contact 212 and a first signal contact 214. In an exemplary embodiment, the first signal contact 214 is arranged in pairs with the first ground contact 212 located between the paired first signal contacts 214 (e.g., in a GSSG arrangement). In an exemplary embodiment, the first contacts 210 are stamped contacts. The first contacts 210 may be formed from a lead frame, such as by stamping from a common sheet of metal. In an exemplary embodiment, the contact holder 230 is overmolded onto the lead frame to hold the relative positions of the first contacts 210.

[0041] Each first contact 210 includes a mating end 220, a terminating end 224, and an intermediate portion 222 between the mating end 220 and the terminating end 224. The intermediate portion 222 is held in a contact holder 230. The intermediate portion 222 extends through the contact holder 230. The mating end 220 extends from the top of the contact holder 230. The mating end 220 is configured to mat to the circuit card 52. Figure 1For example, mating end 220 includes a spring beam 221 configured to be electrically connected to a corresponding card contact 56 of circuit card 52. Spring beam 221 is deflectable. Spring beam 221 has a separable mating interface. In an exemplary embodiment, the end of spring beam 221 is bent to form a separable mating interface. The end of spring beam 221 has a short end extending beyond the separable mating interface to reduce the length of the electrical stub. Termination end 224 extends from the bottom of contact holder 230. Termination end 224 is configured to be electrically connected to main circuit board 20. Figure 1 For example, termination 224 includes solder tail 225, which is configured to be soldered to a pad or trace on the main circuit board 20.

[0042] The contact holder 230 includes a holder body 232 made of a dielectric material, such as a plastic material. The holder body 232 may be a molded part, such as one injection molded. In an exemplary embodiment, the holder body 232 may be an overmolded body configured to overmold onto the intermediate portion 222 of the first contact 210. The contact holder 230 extends between an inner side 234 and an outer side 236. The contact holder 230 may include openings 238 at the inner side 234 and / or the outer side 236 through which the contact 210 is exposed. In an exemplary embodiment, a ground contact 212 is exposed in the opening 238 to allow the inner shield 260 and the outer shield 280 to be electrically connected to the corresponding ground contact 212 through the opening 238.

[0043] The contact retainer 230 extends between the top 240 and the bottom 241. The contact retainer 230 extends between the first end 242 and the second end 243. The contact retainer 230 is elongated between the first end 242 and the second end 243. For example, the sides 234, 236 may be longer than the ends 242, 243.

[0044] In an exemplary embodiment, the contact holder 230 includes positioning features 244 located at an inner side 234 and / or an outer side 236. Positioning features 244 are used to position the inner shield 260 at the inner side 234 and / or the outer shield 280 at the outer side 236. In an exemplary embodiment, positioning features 244 include protrusions extending from the side of the contact holder 230. Other types of positioning features may be used in alternative embodiments. In an exemplary embodiment, recesses 245 are defined between positioning features 244. Recesses 245 may receive portions of the inner shield 260 / outer shield 280.

[0045] Figure 6 This is a perspective view of the inside of the first contact sub-assembly 200 according to an exemplary embodiment. Figure 7This is a perspective view of the outer side of the first contact sub-assembly 200 according to an exemplary embodiment. Figure 6 and Figure 7 An inner shield 260 and an outer shield 280 are shown, connected to the inner side 234 and outer side 236 of the contact holder 230. The inner shield 260 and outer shield 280 provide shielding for the signal contacts 214. In addition to the ground contact 212, the inner shield 260 and outer shield 280 also provide circumferential shielding around each pair of signal contacts 214. For example, the ground contact 212 provides shielding between the pairs of signal contacts 214, and the inner shield 260 and outer shield 280 provide shielding along the inner and outer sides of the pairs of signal contacts 214.

[0046] During assembly, the inner shield 260 is coupled to the inner side 234 of the contact holder 230. In an exemplary embodiment, a positioning element 246 extends from the inner side 234 of the contact holder 230. The positioning element 246 is received in an alignment opening 276 of the inner shield 260. The positioning element 246 can be used to position and / or place the first contact subassembly 200 (e.g., ...) relative to the contact spacer 160. Figure 2 (As shown). The positioning element 246 may be a post or pin configured to receive in an opening in the contact spacer 160. The positioning element 246 may be heat-fused to the contact spacer 160. The positioning element 246 may include a compression rib to form an interference fit with the contact spacer 160. The inner shield 260 is coupled to the positioning feature 244. For example, the positioning feature 244 passes through an opening 271 in the inner shield 260. The cover 270 is located in a recess 245 between the positioning features 244. The connecting wall 272 extends into an opening 238 in the contact holder 230 to abut against a corresponding ground contact 212. The connecting wall 272 may be welded (e.g., laser welded) to the ground contact 212.

[0047] The inner shield 260 provides electrical shielding along the middle portion 222 of the signal contact 214. For example, the inner shield 260 provides electrical shielding along the inner side 234 of the contact holder 230. The inner shield 260 may provide shielding below the bottom 241 and / or above the top 240 of the contact holder 230. In the illustrated embodiment, the inner shield 260 extends directly below the top 240 of the contact holder 230, but extends a distance below the bottom 241 of the contact holder 230 to provide shielding along a portion of the termination end 224 of the signal contact 214. A termination element 278 extends from the bottom of the inner shield 260 and is configured to terminate to the main circuit board 20.

[0048] During assembly, the outer shield 280 is coupled to the outer side 236 of the contact holder 230. The outer shield 280 is coupled to the positioning feature 244. For example, the positioning feature 244 passes through an opening 291 in the outer shield 280. The cover 290 is located in a recess 245 between the positioning features 244. A connecting wall 292 extends into an opening 238 in the contact holder 230 to mate with the corresponding grounding contact 212. The connecting wall 292 can be welded (e.g., laser welded) to the grounding contact 212.

[0049] The outer shield 280 provides electrical shielding along the middle portion 222 of the signal contact 214. For example, the outer shield 280 provides electrical shielding along the outer side 236 of the contact holder 230. The outer shield 280 may provide shielding below the bottom 241 and / or above the top 240 of the contact holder 230. In the illustrated embodiment, the outer shield 280 extends directly below the top 240 of the contact holder 230, but extends a distance below the bottom 241 of the contact holder 230 to provide shielding along a portion of the termination end 224 of the signal contact 214.

[0050] Figure 8 This is a perspective view of the second inner shield 360 of the second contact sub-assembly 300 according to an exemplary embodiment. The second inner shield 360 may be similar to the first inner shield 260. Figure 3 ), and similar parts can be identified using similar reference numerals.

[0051] The inner shield 360 includes a panel 362, which forms a series of recesses 364 between a first end 365 and a second end 366. The inner shield 360 includes a first side surface 367 and a second side surface 368. The first side surface 367 is configured to face the inner side of the second contact holder 330. In an exemplary embodiment, the panel 362 of the inner shield 360 is formed by stamping a sheet of metal. For example, the panel 362 may be formed by stamping a sheet of copper or aluminum. The panel 362 is conductive to provide electrical shielding for the second signal contact 314. The recesses 364 are configured to receive corresponding second signal contacts 314. For example, the recesses 364 may be sized to receive a pair of second signal contacts 314 and / or the portion of the contact holder 330 surrounding the pair of second signal contacts 314.

[0052] In an exemplary embodiment, the inner shield 360 is non-planar. For example, the inner shield 360 includes undulations forming a recess 364. In an exemplary embodiment, the inner shield 360 includes a series of covers 370 and connecting walls 372 between the covers 370. The connecting walls 372 are configured to connect to corresponding grounding contacts 312. For example, the connecting walls 372 may be joined by fusion welding, brazing, or by compression interface or using conductive adhesive or conductive epoxy. The connecting walls 372 are coplanar with each other along a first side 367 of the inner shield 360. The inner shield 360 is electrically connected to each of the grounding contacts 312 at the corresponding connecting walls 372. In various embodiments, the connecting walls 372 include openings 371. The openings 371 are configured to receive portions of the contact holder 330.

[0053] A cover 370 forms a recess 364. The cover 370 extends to a second side 368 of the inner shield 360. In an exemplary embodiment, each cover 370 includes an end wall 374 and side walls 373, 375 extending from opposite sides of the end wall 374. The end wall 374 and side walls 373, 375 define a corresponding recess 364. The end wall 374 may be generally planar. Optionally, each of the end walls 374 is coplanar with each other. In various other embodiments, the end wall 374 may be non-planar, for example, including curved or angled surfaces. The side walls 373, 375 extend between the end wall 374 and a corresponding connecting wall 372. The side walls 373, 375 may be oriented generally perpendicular to the end wall 374 and / or the connecting wall 372. In other embodiments, the side walls 373, 375 may be angled, for example, at an angle between 90° and 160° relative to the end wall 374. The lengths of the sidewalls 373 and 375 determine the depth of the recess 364. The opening 371 may extend into the sidewalls 373 and 375 and / or the endwall 374. In an exemplary embodiment, one or more of the endwalls 374 include an alignment opening 376 for aligning the inner shield 360 to the contact holder 330 and / or receiving a connecting post for connecting the contact holder 330 and the contact spacer 160.

[0054] In an exemplary embodiment, the inner shield 360 includes a termination element 378 extending from the bottom of the plate 362. The termination element 378 is used to electrically connect the inner shield 360 to the main circuit board 30. Figure 1For example, termination element 378 includes a post or pin configured to be received in a plated through-hole of main circuit board 30. Termination element 378 is configured to be soldered to the plated through-hole of main circuit board 30. Termination element 378 defines a direct electrical path between inner shield 360 and main circuit board 30, such as to ground plane of main circuit board 30. Termination element 378 provides a ground path to main circuit board 30 independently of ground contact 312. In the illustrated embodiment, termination element 378 extends from connection wall 372. Optionally, each connection wall 372 may include a corresponding termination element 378. In an alternative embodiment, termination element 378 may additionally or alternatively extend from end wall 374.

[0055] Figure 9 This is a perspective view of the second outer shield 380 of the second contact sub-assembly 300 according to an exemplary embodiment. The second outer shield 380 may be similar to the first outer shield 280. Figure 4 ), and similar parts can be identified using similar reference numerals.

[0056] The outer shield 380 includes a panel 382, ​​which has a series of recesses 384 formed between a first end 385 and a second end 386. The outer shield 380 includes a first side surface 387 and a second side surface 388. The first side surface 387 is configured to face the inner side of the second contact holder 330. In an exemplary embodiment, the panel 382 of the outer shield 380 is formed by stamping a sheet of metal. For example, the panel 382 may be formed by stamping a sheet of copper or aluminum. The panel 382 is conductive to provide electrical shielding for the second signal contact 314. The recesses 384 are configured to receive corresponding second signal contacts 314. For example, the recesses 384 may be sized to receive a pair of second signal contacts 314 and / or the portion of the contact holder 330 surrounding the pair of second signal contacts 314.

[0057] In an exemplary embodiment, the outer shield 380 is non-planar. For example, the outer shield 380 includes undulations forming a recess 384. In an exemplary embodiment, the outer shield 380 includes a series of covers 390 and connecting walls 392 between the covers 390. The connecting walls 392 are configured to connect to corresponding grounding contacts 312. For example, the connecting walls 392 may be joined by fusion welding, brazing, or by compression interface or using conductive adhesive or conductive epoxy. The connecting walls 392 are coplanar with each other along a first side surface 387 of the outer shield 380. The outer shield 380 is electrically connected to each of the grounding contacts 312 at the corresponding connecting walls 392. In various embodiments, the connecting walls 392 include openings 391. The openings 391 are configured to receive portions of the contact holder 330.

[0058] A cover 390 forms a recess 384. The cover 390 extends to a second side 388 of the outer shield 380. In an exemplary embodiment, each cover 390 includes an end wall 394 and side walls 393, 395 extending from opposite sides of the end wall 394. The end wall 394 and side walls 393, 395 define a corresponding recess 384. The end wall 394 may be generally planar. Optionally, each of the end walls 394 may be coplanar with each other. In various other embodiments, the end wall 394 may be nonplanar, for example, including curved or angled surfaces. The side walls 393, 395 extend between the end wall 394 and a corresponding connecting wall 392. The side walls 393, 395 may be oriented generally perpendicular to the end wall 394 and / or the connecting wall 392. In other embodiments, the side walls 393, 395 may be angled, for example, at an angle between 90° and 160° relative to the end wall 394. The lengths of the sidewalls 393 and 395 determine the depth of the recess 384. The opening 391 may extend into the sidewalls 393 and 395 and / or the endwall 394.

[0059] Figure 10 This is a perspective view of a portion of the second contact sub-assembly 300 according to an exemplary embodiment. Figure 10 The second contact subassembly 300 is shown, wherein the outer shield 380 ( Figure 9 The part is removed to show the components of the second contact subassembly 300.

[0060] The second contact subassembly 300 includes second contacts 310 held in a row by a second contact holder 330. The second contacts 310 include a second ground contact 312 and a second signal contact 314. In an exemplary embodiment, the second signal contact 314 is arranged in pairs with the second ground contact 312 located between the paired second signal contacts 314 (e.g., in a GSSG arrangement). In an exemplary embodiment, the second contacts 310 are stamped contacts. The second contacts 310 may be formed from a lead frame, for example, stamped from a common sheet of metal. In an exemplary embodiment, the contact holder 330 is overmolded onto the lead frame to hold the relative positions of the second contacts 310.

[0061] Each second contact 310 includes a mating end 320, a terminating end 324, and an intermediate portion 322 between the mating end 320 and the terminating end 324. The intermediate portion 322 is held in a contact holder 330. The intermediate portion 322 extends through the contact holder 330. The mating end 320 extends from the top of the contact holder 330. The mating end 320 is configured to mate with a circuit card 52. Figure 1For example, mating end 320 includes a spring beam 321, which is configured to be electrically connected to a corresponding card contact 56 of the circuit card 52. The spring beam 321 is deflectable. The spring beam 321 has a separable mating interface. In an exemplary embodiment, the end of the spring beam 321 is bent to form a separable mating interface. The end of the spring beam 321 has a short end extending beyond the separable mating interface to reduce the length of the electrical stub. Termination end 324 extends from the bottom of the contact holder 330. Termination end 324 is configured to be electrically connected to the main circuit board 30. Figure 1 For example, termination 324 includes solder tail 325, which is configured to be soldered to a pad or trace on the main circuit board 30.

[0062] The contact retainer 330 includes a retainer body 332 made of a dielectric material, such as a plastic material. The retainer body 332 may be a molded part, such as one injection molded. In an exemplary embodiment, the retainer body 332 may be an overmolded body configured to overmold onto the intermediate portion 322 of the second contact 310. The contact retainer 330 extends between an inner side 334 and an outer side 336. The contact retainer 330 may include an opening 338 at the inner side 334 and / or the outer side 336 through which the contact 310 is exposed. In an exemplary embodiment, a ground contact 312 is exposed in the opening 338 to allow an inner shield 360 and an outer shield 380 to be electrically connected to the corresponding ground contact 312 through the opening 338.

[0063] The contact retainer 330 extends between the top 340 and the bottom 341. The contact retainer 330 extends between the first end 342 and the second end 343. The contact retainer 330 is elongated between the first end 342 and the second end 343. For example, the sides 334, 336 may be longer than the ends 342, 343.

[0064] In an exemplary embodiment, the contact holder 330 includes positioning features 344 located at an inner side 334 and / or an outer side 336. Positioning features 344 are used to position an inner shield 360 at the inner side 334 and / or to position an outer shield 380 at the outer side 336. In an exemplary embodiment, positioning features 344 include protrusions extending from the side of the contact holder 330. Other types of positioning features may be used in alternative embodiments. In an exemplary embodiment, recesses 345 are defined between positioning features 344. Recesses 345 may receive portions of the inner shield 360 / outer shield 380.

[0065] Figure 11 This is a perspective view of the inside of the second contact sub-assembly 300 according to an exemplary embodiment. Figure 12This is a perspective view of the outer side of the second contact sub-assembly 300 according to an exemplary embodiment. Figure 11 and Figure 12 An inner shield 360 and an outer shield 380 are shown, connected to the inner side 334 and outer side 336 of the contact holder 330. The inner shield 360 and outer shield 380 provide shielding for the signal contacts 314. In addition to the ground contact 312, the inner shield 360 and outer shield 380 also provide circumferential shielding around each pair of signal contacts 314. For example, the ground contact 312 provides shielding between the pairs of signal contacts 314, and the inner shield 360 and outer shield 380 provide shielding along the inner and outer sides of the pairs of signal contacts 314.

[0066] During assembly, the inner shield 360 is coupled to the inner side 334 of the contact holder 330. In an exemplary embodiment, a positioning element 346 extends from the inner side 334 of the contact holder 330. The positioning element 346 is received in an alignment opening 376 of the inner shield 360. The positioning element 346 can be used to position and / or place the second contact subassembly 300 (e.g., ...) relative to the contact spacer 160. Figure 2 (As shown). The positioning element 346 may be a post or pin configured to receive in an opening in the contact spacer 160. The positioning element 346 may be heat-fused to the contact spacer 160. The positioning element 346 may include a compression rib to form an interference fit with the contact spacer 160. The inner shield 360 is coupled to the positioning feature 344. For example, the positioning feature 344 passes through an opening 371 in the inner shield 360. The cover 370 is located in a recess 345 between the positioning features 344. The connecting wall 372 extends into an opening 338 in the contact retainer 330 to abut against a corresponding ground contact 312. The connecting wall 372 may be welded (e.g., laser welded) to the ground contact 312.

[0067] The inner shield 360 provides electrical shielding along the middle portion 322 of the signal contact 314. For example, the inner shield 360 provides electrical shielding along the inner side 334 of the contact holder 330. The inner shield 360 may provide shielding below the bottom 341 and / or above the top 340 of the contact holder 330. In the illustrated embodiment, the inner shield 360 extends directly below the top 340 of the contact holder 330, but extends a distance below the bottom 341 of the contact holder 330 to provide shielding along a portion of the termination end 324 of the signal contact 314. A termination element 378 extends from the bottom of the inner shield 360 and is configured to terminate to the main circuit board 30.

[0068] During assembly, the outer shield 380 is coupled to the outer side 336 of the contact holder 330. The outer shield 380 is coupled to the positioning feature 344. For example, the positioning feature 344 passes through an opening 391 in the outer shield 380. The cover 390 is located in a recess 345 between the positioning features 344. A connecting wall 392 extends into an opening 338 in the contact holder 330 to mate with the corresponding ground contact 312. The connecting wall 392 can be welded (e.g., laser welded) to the ground contact 312.

[0069] The outer shield 380 provides electrical shielding along the middle portion 322 of the signal contact 314. For example, the outer shield 380 provides electrical shielding along the outer side 336 of the contact holder 330. The outer shield 380 may provide shielding below the bottom 341 and / or above the top 340 of the contact holder 330. In the illustrated embodiment, the outer shield 380 extends directly below the top 340 of the contact holder 330, but extends a distance below the bottom 341 of the contact holder 330 to provide shielding along a portion of the termination end 324 of the signal contact 314.

[0070] Figure 13 This is a cross-sectional view of a card edge connector 100 according to an exemplary embodiment. The card edge connector 100 includes a housing 110 and a contact assembly 150 received in a cavity 112 of the housing 110. The contact assembly 150 is aligned with a card slot 114 for engaging contacts 210 with the circuit card 52 when the circuit card 52 is inserted into the card slot 114. Figure 1 )Cooperate.

[0071] During assembly, the contact spacer 160 is located between the first contact subassembly 200 and the second contact subassembly 300. The contact spacer 160 positions the first contact subassembly 200 relative to the second contact subassembly 300. For example, the contact spacer 160 holds the first contact holder 230 against the first wall 130 on a first side of the chamber 112, and holds the second contact holder 330 along the second wall 132 on a second side of the chamber 112. The contact spacer 160 is located between the inner shields 260 and 360.

[0072] The first contact 210 extends along the first wall 130 into a contact recess 134 formed in the first wall 130. The distal end of the contact 210 is located in the contact recess 134 to prevent stubbing when the circuit card 52 is inserted into the card slot 114. In an exemplary embodiment, the first contact 210 may be preloaded with an internal spring bias force in an inward direction facing the card slot 114 to ensure that the mating end of the first contact 210 interfaces with the circuit card 52, which is inserted into the card slot 114. When the circuit card 52 is inserted into the card slot 114, the circuit card 52 can deflect the mating end of the first contact 210 outward, thereby increasing the spring force of the spring beam against the circuit card 52 to maintain a reliable electrical connection between the first contact 210 and the circuit card 52.

[0073] The first shielding structure 250 provides electrical shielding for the first signal contacts 214. For example, a first ground contact 212 is located between the pairs of first signal contacts 214 to provide shielding between the pairs of first signal contacts 214. The inner shield 260 of the first shielding structure 250 provides shielding along the inner side of the pair of first signal contacts 214. The outer shield 280 of the first shielding structure 250 provides shielding along the outer side of the pair of first signal contacts 214. In an exemplary embodiment, the first shielding structure 250 provides circumferential shielding around each pair of first signal contacts 214. For example, 360° shielding is provided around each pair of first signal contacts 214. The shielding is continuous around the pair of first signal contacts 214 along the inner shield 260, through the wing ground contact 212, and along the outer shield 280. For example, the first shielding structure 250 forms a first shielding tunnel 252 for each pair of first signal contacts 214. The first shielding tunnel 252 provides 360° shielding around the corresponding pair of first signal contacts 214. The first shielding structure 250 provides shielding along the middle portion 222 of the signal contact 214, for example, along the transition between the termination end 224 and the mating end 220. The termination end 224 extends out of the first shielding tunnel 252 for termination to the main circuit board 20. For example, the termination end 224 is bent 90° at the bottom of the card edge connector 100 for surface mounting to the top surface of the main circuit board 20.

[0074] The second contact 310 extends along the second wall 132 into a contact recess 136 formed in the second wall 132. The distal end of the contact 310 is located in the contact recess 136 to prevent stubbing when the circuit card 52 is inserted into the slot 114. In an exemplary embodiment, the second contact 310 may be preloaded with an internal spring bias force in an inward direction facing the slot 114 to ensure that the mating end of the second contact 310 interfaces with the circuit card 52, which is inserted into the slot 114. When the circuit card 52 is inserted into the slot 114, the circuit card 52 can deflect the mating end of the second contact 310 outward, thereby increasing the spring force of the spring beam against the circuit card 52 to maintain a reliable electrical connection between the second contact 310 and the circuit card 52.

[0075] The second shielding structure 350 provides electrical shielding for the second signal contacts 314. For example, a second ground contact 312 is located between the pairs of second signal contacts 314 to provide shielding between the pairs of second signal contacts 314. The inner shield 360 of the second shielding structure 350 provides shielding along the inner side of a pair of second signal contacts 314. The outer shield 380 of the second shielding structure 350 provides shielding along the outer side of the pair of second signal contacts 314. In an exemplary embodiment, the second shielding structure 350 provides circumferential shielding around each pair of second signal contacts 314. For example, 360° shielding is provided around each pair of second signal contacts 314. The shielding member is continuous around the pair of second signal contacts 314 along the inner shield 360, through the side ground contact 312, and along the outer shield 380. For example, the second shielding structure 350 forms a second shielding tunnel 352 for each pair of second signal contacts 314. The second shielding tunnel 352 provides 360° shielding around the corresponding pair of second signal contacts 314. The second shielding structure 350 provides shielding along the middle portion 322 of the signal contact 314, for example, along the transition between the termination end 324 and the mating end 320. The termination end 324 extends out of the second shielding tunnel 352 for termination to the main circuit board 30. For example, the termination end 324 is bent 90° at the bottom of the card edge connector 100 for surface mounting to the top surface of the main circuit board 30.

[0076] Figure 14 This is a cross-sectional view of a portion of the card edge connector 100, showing the contact assembly 150 within the chamber 112 of the housing 110. A contact spacer 160 is located between the first contact sub-assembly 200 and the second contact sub-assembly 300.

[0077] The first contact subassembly 200 includes a row of first contacts 210 held by a first contact holder 230. The first contact holder 230 maintains the relative position of the first contacts 210. In an exemplary embodiment, the first contacts 210 include a pair of first ground contacts 212 and a first signal contact 214 disposed between the first ground contacts 212. A first shielding structure 250 is coupled to the first ground contacts 212 to provide circumferential shielding around each pair of first signal contacts 214 via the first contact holder 230. For example, connecting walls 272, 292 of the inner shield 260 and the outer shield 280 are joined (e.g., laser welded) to opposite sides of the first ground contacts 212. Panels 262, 282 provide shielding along the inner and outer sides of the first contact subassembly 200. Panels 262 and 282 are undulated to form recesses 264 and 284 for the first signal contact 214 and connecting walls 272 and 292 for connection to the first ground contact 212.

[0078] Inner shield 260 and outer shield 280, along with the first ground contact 212, form a first shielding tunnel 252, which provides circumferential electrical shielding around each pair of first signal contacts 214. For example, the first ground contact 212 is located between the pairs of first signal contacts 214. Inner cover 270 extends along the inside of a pair of first signal contacts 214. Outer cover 290 extends along the outside of a pair of first signal contacts 214. Covers 270 and 290 form recesses 264 and 284, respectively, on the inner and outer sides of the first signal contacts 214. Recesses 264 and 284 may receive portions of the first contact holder 230 and / or portions of the first signal contacts 214. Covers 270 and 290 are spaced apart from the first signal contacts 214 by a space. The spacing can be selected to control impedance. The first contact holder 230 may at least partially fill the space between covers 270 and 290 and the first signal contacts 214. Optionally, air may at least partially fill the space between the covers 270, 290 and the first signal contact 214.

[0079] In an exemplary embodiment, the first shielding structure 250 is a multi-piece shielding structure. For example, the first shielding structure 250 includes a first inner shielding member 260 extending along the inside of the first contact holder 230 and a first outer shielding member 280 extending along the outside of the first contact holder 230. The inner shielding member 260 and the outer shielding member 280 provide shielding along opposite sides of the first signal contact 214. The inner shielding member 260 and the outer shielding member 280 are electrically connected to each of the first grounding contacts 212 so that the first shielding structure 250 and the first grounding contacts 212 are electrically shared.

[0080] The second contact subassembly 300 includes a row of second contacts 310 held by a second contact holder 330. The second contact holder 330 maintains the relative position of the second contacts 310. In an exemplary embodiment, the second contacts 310 include a pair of second ground contacts 312 and a second signal contact 314 disposed between the second ground contacts 312. A second shielding structure 350 is coupled to the second ground contacts 312 to provide circumferential shielding around each pair of second signal contacts 314 via the second contact holder 330. For example, connecting walls 372, 392 of the inner shielding member 360 and the outer shielding member 380 are connected (e.g., laser welded) to opposite sides of the second ground contacts 312. Panels 362, 382 provide shielding along the inner and outer sides of the second contact subassembly 300. Panels 362 and 382 are undulating to form recesses 364 and 384 for the second signal contact 314 and connecting walls 372 and 392 for connection to the second ground contact 312.

[0081] Inner shield 360, outer shield 380, and second ground contact 312 form a second shielding tunnel 352, which provides circumferential electrical shielding around each pair of second signal contacts 314. For example, the second ground contact 312 is located between the pairs of second signal contacts 314. Inner cover 370 extends along the inside of a pair of second signal contacts 314. Outer cover 390 extends along the outside of a pair of second signal contacts 314. Covers 370 and 390 form recesses 364 and 384, respectively, on the corresponding inside and outside of the second signal contacts 314. Recesses 364 and 384 may receive portions of the second contact holder 330 and / or portions of the second signal contacts 314. Covers 370 and 390 are spaced apart from the second signal contacts 314 by space. The spacing can be selected to control impedance. The second contact holder 330 may at least partially fill the space between covers 370 and 390 and the second signal contacts 314. Optionally, air may at least partially fill the space between the covers 370, 390 and the second signal contact 314.

[0082] In an exemplary embodiment, the second shielding structure 350 is a multi-piece shielding structure. For example, the second shielding structure 350 includes a second inner shielding member 360 extending along the inside of the second contact holder 330 and a second outer shielding member 380 extending along the outside of the second contact holder 330. The inner shielding member 360 and the outer shielding member 380 provide shielding along opposite sides of the second signal contact 314. The inner shielding member 360 and the outer shielding member 380 are electrically connected to each second ground contact 312 so that the second shielding structure 350 and the second ground contact 312 are electrically shared.

Claims

1. A card edge connector (100), comprising: The housing (110) includes a chamber (112) and a slot (114) at a mating end of the housing, the slot (114) being configured to receive the card edge (54) of a circuit card (52), the housing being configured to be mounted to a main circuit board (20); and A contact assembly (150) is received in the chamber for connection to the edge of a card inserted into the card slot, the contact assembly including a first contact subassembly (200) and a second contact subassembly (300); The first contact subassembly includes an array (202) of first contacts (210) held by a first contact holder (230), the first contacts passing through the first contact holder, the first contacts including a first ground contact (212) and a first signal contact (214), the first signal contacts being arranged in pairs (216), the first ground contact being located between the pairs of first signal contacts, the first contact subassembly including a first shielding structure (250) coupled to the first ground contact, the first shielding structure and the first ground contact providing circumferential shielding around each pair of first signal contacts via the first contact holder, the first shielding structure being configured to be directly electrically connected to the main circuit board; The second contact subassembly includes an array (302) of second contacts (310) held by a second contact holder (330), the second contacts passing through the second contact holder, the second contacts including a second ground contact (312) and a second signal contact (314), the second signal contacts being arranged in pairs (316), the second ground contact being located between the pairs of second signal contacts, the second contact subassembly including a second shielding structure (350) coupled to the second ground contact, the second shielding structure and the second ground contact providing circumferential shielding around each pair of second signal contacts via the second contact holder, the second shielding structure being configured to be directly electrically connected to the main circuit board.

2. The card edge connector (100) according to claim 1, wherein, The first shielding structure (250) includes a first shielding tunnel (252), each first shielding tunnel receiving the first contact holder (230) and a corresponding pair (216) of first signal contacts (214), and wherein the second shielding structure (350) includes a second shielding tunnel (352), each second shielding tunnel receiving the second contact holder (330) and a corresponding pair (316) of second signal contacts (314).

3. The card edge connector (100) according to claim 1, wherein, The first shielding structure (250) is spaced apart from the first signal contact (214) by a space, the first contact holder (230) at least partially fills the space between the first shielding structure and the first signal contact, and wherein the second shielding structure (350) is spaced apart from the second signal contact (314) by a space, the second contact holder (330) at least partially fills the space between the second shielding structure and the second signal contact.

4. The card edge connector (100) according to claim 1, wherein, The first shielding structure (250) includes a first inner shield (260) connected to the inner side (234) of the first contact holder (230) and a first outer shield (280) connected to the outer surface (236) of the first contact holder, the first inner shield and the first outer shield being connected to the first ground contact (212), and wherein the second shielding structure (350) includes a second inner shield (360) connected to the inner side (334) of the second contact holder (330) and a second outer shield (380) connected to the outer surface (336) of the second contact holder, the second inner shield and the second outer shield being connected to the second ground contact (312).

5. The card edge connector (100) according to claim 4, wherein, The first inner shield (260) and the first outer shield (280) are connected to opposite sides (267, 268) of each of the first grounding contacts (212), and wherein the second inner shield (360) and the second outer shield (380) are connected to opposite sides (367, 368) of each of the second grounding contacts (312).

6. The card edge connector (100) according to claim 4, wherein, The first inner shield (260) includes a panel (262) including recesses (284), each recess receiving the first contact holder (230) and a corresponding first signal contact (214) of (216), and wherein the first outer shield (280) includes a panel (282) including recesses (284), each recess receiving the first contact holder and a corresponding first signal contact, and wherein the second inner shield (360) includes a panel (362) including recesses (364), each recess receiving the second contact holder (330) and a corresponding second signal contact (314) of (316), and wherein the second outer shield (380) includes a panel (382) including recesses (384), each recess receiving the second contact holder and a corresponding second signal contact.

7. The card edge connector (100) according to claim 4, wherein, The first inner shield (260) includes a series of covers (270) and connecting walls (272) between the covers, the connecting walls being connected to corresponding first ground contacts (212), the covers forming recesses (264) between the connecting walls, each recess receiving a first contact holder (230) and a corresponding pair of first signal contacts (214); and wherein the first outer shield (280) includes a series of covers (290) and connecting walls (292) between the covers, the connecting walls being connected to corresponding first ground contacts, the covers forming recesses (284) between the connecting walls, each recess receiving a first contact holder and a corresponding pair of first signal contacts; Furthermore, the second inner shield (360) includes a series of covers (370) and connecting walls (372) between the covers, the connecting walls being connected to corresponding second grounding contacts (312), the covers forming recesses (364) between the connecting walls, each recess receiving a second contact holder (330) and a corresponding pair of second signal contacts (314); and the second outer shield (380) includes a series of covers (390) and connecting walls (392) between the covers, the connecting walls being connected to corresponding second grounding contacts, the covers forming recesses (384) between the connecting walls, each recess receiving a second contact holder and a corresponding pair of second signal contacts.

8. The card edge connector (100) according to claim 1, wherein, The first grounding contact (212) includes a termination terminal (224) configured to be connected to the main circuit board (20), the first shielding structure (250) includes a termination element (278) configured to be connected to the main circuit board, and wherein the second grounding contact (312) includes a termination terminal (324) configured to be connected to the main circuit board, and the second shielding structure (350) includes a termination element (378) configured to be connected to the main circuit board.

9. The card edge connector (100) according to claim 1, wherein, The contact assembly (150) includes a contact spacer (160) positioned between the first contact subassembly (200) and the second contact subassembly (300).

10. The card edge connector (100) according to claim 9, wherein, The contact spacer (160) is located between the first shielding structure (250) and the second shielding structure (350).

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