CN218101923U

CN218101923U - High-frequency large-current USB socket

Info

Publication number: CN218101923U
Application number: CN202221962885.XU
Authority: CN
Inventors: 资华古; 李科
Original assignee: Shenzhen Everwin Precision Technology Co Ltd
Current assignee: Shenzhen Everwin Precision Technology Co Ltd
Priority date: 2022-07-27
Filing date: 2022-07-27
Publication date: 2022-12-20
Anticipated expiration: 2032-07-27

Abstract

The utility model provides a high frequency heavy current USB socket, includes first terminal module, second terminal module, conducting strip and insulator, second terminal module includes second terminal group, first terminal module includes first terminal group, shielding piece and snap-plate, first terminal group and second terminal group are all including two ground terminals that are located horizontal both sides, be located two pairs of first signal terminals inboard of two ground terminals, be located two pairs of first signal terminals inboard two power terminals and be located two second signal terminals between the power terminal, the conducting strip switches on four power terminals of first terminal group and second terminal group, insulator includes the basal portion, certainly the forward parcel portion that extends formation of basal portion, certainly the forward butt joint tongue portion that extends formation of parcel portion, basal portion front end limit is equipped with the sealing washer groove, the sealing washer inslot cover is equipped with the sealing washer. The waterproof high-current high-frequency plug-in and pull-out resistant cable has the performance advantages of being waterproof, high in current, high in frequency and resistant to plugging and unplugging.

Description

High-frequency large-current USB socket

Technical Field

The present application relates to the field of electrical connectors, and more particularly to a high frequency and high current USB socket.

Background

Patent application No. 201811145519.3 of the people's republic of China discloses a high-frequency large-current USB socket, which is characterized in that a power supply terminal and a grounding terminal are separately punched and formed, and the thicknesses of the power supply terminal and the grounding terminal are larger than those of other signal terminals so as to reduce the impedance of the power supply terminal and the grounding terminal and improve the conductive capability. The middle plate has buckling force with the plug and shields signal interference of the first signal terminals of the upper row of terminal groups and the lower row of terminal groups, the middle plate is provided with a main body plate extending between the first signal terminals of the upper row of terminal groups and the lower row of terminal groups and protrudes from the transverse outer side of the front end of the main body plate to form a protruding portion, the protruding portion is used for buckling with the plug, and in order to avoid the protruding portion to be in contact with the grounding terminal, an avoiding groove is formed in the corresponding position of the grounding terminal. For example, patent application No. 202210226994.3 of the people's republic of china discloses another high-frequency large-current USB socket solution, which is improved in that a conductive sheet is provided to conduct four power terminals of the upper and lower rows of terminal groups together in the front-rear direction, so as to further reduce the impedance of the power terminals. And the middle plate is conducted with the grounding terminal of one terminal group to reduce the current pressure of the grounding terminal. But the medium plate still need undertake with the buckle function of USB plug, if adopt stainless steel then shunt power limited, adopt copper material then wear resistance limited. The shunting and buckling functions borne by the middle plate need to be improved urgently so as to greatly improve the performances of the middle plate and the middle plate.

SUMMERY OF THE UTILITY MODEL

Therefore, there is a need for a USB socket with high frequency and large current, which is waterproof, resistant to plugging and unplugging, and capable of shunting effectively to support high power.

In order to solve the technical problem, the application provides a high-frequency large-current USB socket, including first terminal module, second terminal module, conducting strip and incite somebody to action first terminal module and second terminal module fixing insulator as an organic whole, the second terminal module includes second terminal group, first terminal module includes first terminal group, shielding piece and buckle plate, first terminal group and second terminal group all include two ground terminal that are located horizontal both sides, be located two pairs of first signal terminal of two ground terminal inboards, be located two power terminals of two pairs of first signal terminal inboards and be located a plurality of second signal terminal between two power terminals, the conducting strip switches on four power terminals of first terminal group and second terminal group, insulator includes the basal portion, certainly the basal portion is preceding to extending the parcel portion that forms, certainly the parcel portion is preceding to extending the butt joint tongue portion that forms, basal portion front end edge is equipped with the sealing washer groove, the sealing washer inslot endotheca is equipped with the sealing washer, the sealing washer is in front and back direction extrusion object thing realizes waterproofly.

Preferably, an outer diameter of the seal ring groove is larger than an outer diameter of the packing portion, and a front end of the seal ring groove is opened to expose the seal ring to the front end of the seal ring groove.

Preferably, the USB socket further includes a metal fixing plate formed in the base, the metal fixing plate includes a crimping beam crimped on the upper side of the first terminal module, and an ear portion formed by bending downwards two lateral sides of the crimping beam and then bending horizontally, the ear portion penetrates through a fixing hole, the base wraps the ear portion, and the fixing hole is locked on the printed circuit board.

Preferably, the shielding plate shields the first signal terminals vertically corresponding to the first terminal group and the second terminal group, the buckling plate and the shielding plate are separately and independently arranged, the buckling plate is located on the outer side of the front end of the grounding terminal and exposed outside the insulating body, and the buckling plate is formed by stamping stainless steel.

Preferably, the first signal terminal is used for transmitting high-frequency signals, the shielding sheet includes a shielding sheet body extending along the front-back direction and located between the first signal terminals of the first terminal group and the second terminal group, the rear end of the shielding sheet body exceeds the rear end of the first signal terminal of the second terminal group, the shielding sheet further includes a first connecting portion extending along the transverse outer side from the front end of the shielding sheet body, an extending portion extending along the transverse outer side from the rear end of the shielding sheet body, a second connecting portion formed on the transverse outer side of the extending portion, and a solder foot extending from the rear end of the extending portion.

Preferably, ground terminal, power supply terminal form through the punching press of same metal copper, first signal terminal forms through the punching press of same metal copper with second signal terminal, the thickness of ground terminal and power supply terminal is greater than the thickness of first signal terminal and second signal terminal, the shielding piece adopts the punching press of metal copper to form, the first material portion of shielding piece and epitaxial portion are crossed respectively in front and back both ends ground terminal and with ground terminal electric conductance.

Preferably, the buckle plate is located at the front end of the first material connecting portion, and the buckle plate is in press-connection with the ground terminal of the first terminal group, and the buckle plate comprises an embedding plate body, a glue filling perforation penetrating through the embedding plate body, a buckle groove exposed to the transverse outer side of the insulating body and a material belt connecting portion.

Preferably, the ground terminal of the second terminal group is provided with an avoidance groove corresponding to the first connecting portion of the snap-in plate and the shielding plate so as to realize electrical isolation between the snap-in plate and the shielding plate.

Preferably, the first terminal module further includes a first insulator that holds the first terminal set, the shielding plate, and the snap-in plate together, the first insulator is formed with a contact groove at a lower middle portion, a lower surface of the power terminal of the first terminal set is exposed in the contact groove, and the conductive plate is placed in the contact groove and electrically contacted with the power terminal of the first terminal set.

Preferably, the second terminal module further includes a second insulator for integrally holding the first terminal group, an exposure groove corresponding to the contact groove is formed in an upper side surface of the second insulator, an upper surface of the power terminal of the second terminal group is exposed in the exposure groove, and after the first terminal module and the second terminal module are stacked, the conductive sheet is electrically contacted and conducted with the power terminal of the second terminal group, so that the conductive sheet conducts the four power terminals of the first terminal group and the second terminal group together.

This application high frequency heavy current USB socket's insulator's basal portion front end edge sets up the sealing washer groove, overlaps again and establishes the sealing washer in front and back plug direction and the extrusion of object and realize waterproofly, and waterproof performance is good.

This application high frequency heavy current USB socket will the buckle board with the independent separation of shielding piece sets up, the shielding piece adopt the copper product to make and with ground terminal switches on and comes shunt current, the buckle board adopts stainless steel matter to make and arranges in the outside and be used for inserting with the plug to making it have good wear resistance, has avoided among the prior art the two to adopt a body structure and can't compromise low impedance and wear-resisting problem.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a perspective view of a high-frequency large-current USB socket according to the present application;

FIG. 2 is an exploded perspective view of the high frequency high current USB socket of the present application;

fig. 3 is an exploded perspective view of a first terminal module and a second terminal module of the high-frequency large-current USB socket according to the present invention;

fig. 4 is a perspective view of a first terminal module of the high-frequency high-current USB socket of the present application;

fig. 5 is a perspective view of a second terminal module of the high-frequency high-current USB socket of the present application;

fig. 6 is a perspective view of the first terminal set, the conductive plate, the shielding plate and the latch plate of the high-frequency large-current USB socket of the present application;

fig. 7 is a bottom view of the first terminal set, the second terminal set, the shielding plate, the conductive plate and the fastening plate of the high-frequency large-current USB socket of the present application;

FIG. 8 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 7;

fig. 9 is a sectional view taken along the line B-B shown in fig. 7.

Description of the reference numerals

A conductive sheet-10; a first terminal module-20; a ground terminal-201; a power supply terminal-202; a first signal terminal-203; a second signal terminal-204; a first terminal set-21; a contact portion-211; an embedded part-212; a solder tail-213; a first insulator-22; contact groove-221; a positioning post-222; a shielding sheet-23; a shield sheet body-231; a first connecting portion-232; an extension-233; a second connecting material part-234; a solder tail-235; a snap plate-24; an embedded plate body-241; a snap groove-242; glue-pouring perforation-243; a first tape connection portion-244; a second strip material connecting part-245; a second terminal module-30; a second terminal set-31; avoidance slot-311; a second insulator-32; an exposure groove-321; -322, a barrier; an outer slot-323; a metal fixing plate-40; a cross beam-41 is crimped; a bending part-42; ear-43, 512; fixing holes-44,513; -an insulator body-50; a base-51; a base portion-511; a wrapping portion-52; a docking tongue-53; a seal ring groove-54; tail-55; a seal ring-60; a protective cover-70; a cover plate-71; a peripheral wall-72; a welding foot-73; a fixed hook-74; waterproof glue-80.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only a few embodiments of the present application, and not all embodiments.

In the present application, the X direction shown in fig. 1 is taken as the front of the longitudinal direction, the Y direction is taken as the lateral direction, and the Z direction is taken as the vertical direction.

Referring to fig. 1 and 2, the high-frequency large-current USB socket of the present application includes a first terminal module 20, a second terminal module 30, a conductive plate 10 electrically connecting the first terminal module 20 and the second terminal module 30, an insulating body 50 holding the first terminal module 20, the second terminal module 30 and the conductive plate 10 together, a metal fixing plate 40 embedded in the insulating body 50, a sealing ring and a protection cover 70.

The insulative housing 50 includes a base 51, a covering 52 extending forward from the base 51, a mating tongue 53 extending forward from the covering 52, and a tail 55 extending rearward from the base 51. A seal ring groove 54 having an outer diameter slightly larger than the wrapping portion 52 is formed at the front end edge of the base portion 51, the outer diameter of the lateral outer side of the seal ring groove 54 is larger than the outer diameter of the wrapping portion 52, and the front end side of the seal ring groove 54 is opened to press and seal the seal ring 60 thereon with the object from the front end surface.

The base 51 includes a base portion 511, an ear portion 512 formed by bending downward from the outer side of the base portion 511 in the lateral direction, and a fixing hole 513 formed through the ear portion 512. The metal fixing plate 40 is embedded in the base 51, and the metal fixing plate 40 includes a crimping beam 41 crimped on the upper side of the first terminal module 20, a bent portion 42 formed by bending two lateral sides of the crimping beam 41, an ear portion 43 formed by horizontally bending and extending from the bent portion 42, and a fixing hole 44 formed by penetrating through the ear portion 43. The ear portion 43 of the metal fixing plate 40 is wrapped by the ear portion 512 of the insulation body 50, and the fixing hole 44 of the metal fixing plate 40 is overlapped with the fixing hole 513 of the insulation body 50. This application high frequency heavy current USB socket welds on printed circuit board, crimping crossbeam 41 is located and keeps away from printed circuit board one side.

As shown in fig. 3 to 9, the first terminal module 20 includes a first terminal set 21, a shielding plate 23, a fastening plate 24, and a first insulator 22 that holds the first terminal set 21, the shielding plate 23, and the fastening plate 24 together. The second segment sub-module 30 includes a second terminal set 31 and a second insulator 32 that holds the second terminal set 31 as a whole.

Each of the first terminal group 21 and the second terminal group 32 includes a pair of ground terminals 201 located on the outermost side in the lateral direction, two pairs of first signal terminals 203 located inside the pair of ground terminals 201, a pair of power terminals 202 located inside the two pairs of first signal terminals 203, and two pairs of second signal terminals 204 located between the pair of power terminals 202. The ground terminal 201 and the power terminal 202 are formed by punching a single metal plate, and the first signal terminal 203 and the second signal terminal 204 are formed by punching another metal plate. The thicknesses of the ground terminal 201 and the power terminal 202 are greater than the thicknesses of the first signal terminal 203 and the second signal terminal 204, and the outer surfaces of the ground terminal 201 and the power terminal 202 are flush with the outer surfaces of the first signal terminal 203 and the second signal terminal 204. The first signal terminals 203 are used for transmitting high-frequency signals, and a pair of adjacent first signal terminals 203 form a differential pair. The second signal terminal 204 is compatible with the signal transmission standard of USB2.0, and includes a low frequency differential pair and transmits control signals.

Each of the conductive terminals of the first terminal set 21 and the second terminal set 31 includes a contact portion 211 exposed on the upper or lower surface of the mating tongue portion 53, an embedded portion 212 extending rearward from the contact portion 211, and a solder fillet 213 extending rearward from the embedded portion 212. The ground terminal 201, the power terminal 202, and the first signal terminal 203 of the first terminal group 21 are flush with the upper surface of the contact portion 211 of the second signal terminal 204 and exposed to the upper surface of the mating tongue 53. The ground terminal 201, the power terminal 202, and the first signal terminal 203 of the second terminal set 31 are flush with the lower surface of the contact portion of the second signal terminal 204 and exposed to the lower surface of the mating tongue 53.

The shield piece 23 includes a shield piece 231 located between the first terminal group 21 and the high-frequency signal terminals 203 of the second terminal group 31, a first connecting portion 232 extending laterally outward from a front end of the shield piece 231 and crossing the ground terminal 201, an extending portion 233 extending laterally outward from a rear end of the shield piece 231 and crossing the ground terminal 201, a second connecting portion 234 connected to the laterally outward side of the extending portion 233, and a fillet 235 extending rearward from a rear end of the extending portion 233. The solder fillets 235 of the shield plate 23 are aligned with the solder fillets of the first terminal set 21. The first connection portion 232 and the extension portion 233 are in electrical contact with the surface of the ground terminal 201 when passing over the ground terminal 201. The shield sheet 231 and the first signal terminal 203 are not in contact with each other and are electrically isolated from each other by filling plastic material therebetween. The shield plate 23 is in electrical contact with only the ground terminal 201 of the first terminal set 21 and not with the ground terminal 201 of the second terminal set 31. In another embodiment, the shielding plate 23 may also be electrically contacted with the ground terminal 201 of the second terminal set 31. The shielding plate 23 is electrically contacted with the grounding terminal 201 to shunt current so as to reduce impedance and heat generation during high-power charging.

The latch plate 24 is located between the ground terminals 201 of the first terminal group 21 and the second terminal group 31, and the latch plate 24 includes an embedding plate 241 attached to the lower side of the first terminal group 21, a glue filling through hole 243 penetrating through the embedding plate 241, a latch groove 242 extending outward from the lateral outer side of the embedding plate 241 and exposed to the lateral outer side of the docking tongue 53, a first tape connecting portion 244 formed at the front end of the latch groove 241, and a second tape connecting portion 245 formed at the rear end of the embedding plate 241. The latch plate 24 is located outside the front end of the shielding plate 23, in the vertical projection direction, the latch plate 24 covers a part of the contact portion 211 of the ground terminal 201, and the second material strap connecting portion 245 may also be located outside the embedding plate 241 in the transverse direction. The first terminal group 21, the second terminal group 31, the shielding sheet 23 and the conducting sheet 10 are all formed by stamping copper materials, and have good conductivity for transmitting signals and current; the fastening plate 24 is formed by stamping stainless steel plates, so that the fastening plate has good wear resistance.

The first terminal set 21, the shielding plate 23 and the snap-in plate 24 are fixed together in an overlapping manner and then are subjected to in-mold injection molding to form the first insulator 22, and the first insulator 22 holds the first terminal set 21, the shielding plate 23 and the snap-in plate 24 together and forms the first terminal module 20. A contact slot 221 and a plurality of positioning posts 222 protruding downward from the contact slot 221 are formed in the middle of the lower surface of the first insulator 22, the lower surfaces of the pair of power terminals 202 of the first terminal group 21 are exposed at two lateral sides of the contact slot 221, the conductive sheet 10 is installed in the contact slot 221, the two lateral sides of the conductive sheet 10 are electrically contacted and conducted with the lower surfaces of the pair of power terminals 202 in the front-rear direction, and a plurality of positioning holes (not numbered) matched with the positioning posts 222 are formed in the conductive sheet 10 to limit the conductive sheet 10 at a predetermined position of the contact slot 221.

The second terminal group 31 of the second terminal module 30 includes a ground terminal 201, a power terminal 202, a first signal terminal 203, a second signal terminal 204, and the like, as in the first terminal group 21. In this embodiment, different from the first terminal set 21, an avoiding groove 311 is formed on the upper surface of the contact portion 211 of the second terminal set 31 to avoid the first connecting portion 232 of the locking plate 24 and the shielding plate 23. The upper surface of the second insulator 32 includes an exposure groove 321 corresponding to the contact groove 221, a barrier 322 at both lateral sides of the exposure groove 321, and an outer groove 323 at a lateral outer side of the barrier 322. The upper surface of the ground terminal 201 of the second terminal set 31 is exposed in the exposure groove 321, the first terminal module 21 and the second terminal module 31 are stacked together, the conductive sheet 10 is clamped between the first terminal module and the second terminal module 31, the conductive sheet 10 is accommodated in the contact groove 221 and the exposure groove 321, and the conductive sheet 10 is in contact conduction with the pair of power terminals 202 of the first terminal set 21 and the pair of power terminals 202 of the second terminal set 31 to shunt current, so as to improve current transmission capability. The outer slots 323 correspond to the shield plates 23.

The first terminal module 20, the conducting strip 10 and the second terminal module 30 are fixed in an overlapping manner and then are subjected to injection molding to form the insulating body 50.

In another embodiment, the avoiding groove 311 is not formed on the upper surface of the contact portion 211 of the ground terminal 201 of the second terminal set 31, so that the shielding plate 23 simultaneously conducts the ground terminals 201 of the first terminal set 21 and the second terminal set 31 respectively located at the upper and lower sides to realize shunting.

The insulating body 50 is filled with waterproof glue 80 and hardened to realize waterproof. The protective cover 70 is further covered on the upper side of the tail portion 55, and the protective cover 70 includes a cover plate 71, a peripheral wall 72 formed by bending and extending downward from the rear side and the two lateral sides of the cover plate 71, a welding leg 73 formed by protruding downward from the peripheral wall 72, and a fixing hook 74 which tears the two lateral sides of the cover plate 71 and is fastened on the tail portion 55.

This application high frequency heavy current USB socket will buckle board 24 with shielding piece 23 separates the setting alone, shielding piece 23 adopt the copper product to make and with ground terminal 201 switches on and comes shunt current, buckle board 24 adopts stainless steel matter to make and arranges in the outside and be used for to inserting with the plug, makes it have good wear resistance, has avoided among the prior art the two to adopt a body structure and can't compromise low impedance and wear-resisting problem.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only represent preferred embodiments of the present invention, which are described in more detail and detail, but are not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides a high frequency heavy current USB socket, its characterized in that includes first terminal module, second terminal module, conducting strip and will first terminal module and second terminal module fixing insulator as an organic whole, the second terminal module includes the second terminal group, first terminal module includes first terminal group, shielding piece and buckle plate, first terminal group and second terminal group all include two ground terminal that are located horizontal both sides, two pairs of first signal terminal that are located two ground terminal inboards, be located two power supply terminals of two pairs of first signal terminal inboards and be located a plurality of second signal terminal between two power supply terminals, the conducting strip switches on four power supply terminals of first terminal group and second terminal group, insulator includes the basal portion, from the parcel portion that the basal portion forward extension formed, from the butt joint tongue portion that the parcel portion forward extension formed, the basal portion front end edge is equipped with the sealing washer groove around, the sealing washer inslot endotheca sealing washer, an object is extruded to the sealing washer direction and is realized waterproofly.

2. A high-frequency large-current USB socket according to claim 1, wherein the outer diameter of the seal ring groove is larger than the outer diameter of the cover portion, and a front end of the seal ring groove is open so that the seal ring is exposed to the front end of the seal ring groove.

3. The high-frequency large-current USB socket according to claim 2, wherein the USB socket further comprises a metal fixing plate formed in the base, the metal fixing plate comprises a crimping beam crimped on the upper side of the first terminal module, and an ear portion formed by bending downward from two lateral sides of the crimping beam and then bending horizontally, the ear portion is penetrated to form a fixing hole, the base wraps the ear portion, and the fixing hole is locked on a printed circuit board.

4. The high-frequency large-current USB socket according to claim 3, wherein the shielding plate shields the first signal terminals corresponding to the first terminal set and the second terminal set up and down, the latch plate is separately and independently disposed from the shielding plate, the latch plate is located outside the front end of the ground terminal and exposed outside the insulating body, and the latch plate is formed by stamping stainless steel.

5. The high-frequency high-current USB socket according to claim 4, wherein the first signal terminals are used for transmitting high-frequency signals, the shielding plate includes a shielding plate body extending in the front-rear direction and located between the first signal terminals of the first terminal group and the first signal terminals of the second terminal group, the rear end of the shielding plate body extends beyond the rear end of the first signal terminals of the second terminal group, and the shielding plate further includes a first connecting portion extending from the front end of the shielding plate body along the lateral outer side, an extension portion extending from the rear end of the shielding plate body along the lateral outer side, a second connecting portion formed on the lateral outer side of the extension portion, and a solder tail extending from the rear end of the extension portion.

6. The high-frequency large-current USB socket according to claim 5, wherein the ground terminal and the power terminal are formed by punching a same metal copper plate, the first signal terminal and the second signal terminal are formed by punching a same metal copper plate, the thickness of the ground terminal and the power terminal is greater than the thickness of the first signal terminal and the second signal terminal, the shielding plate is formed by punching a metal copper plate, and the first connecting portion and the extending portion of the shielding plate cross the ground terminal at the front end and the rear end and are electrically connected to the ground terminal.

7. The high-frequency large-current USB socket according to claim 6, wherein the latch plate is located at a front end of the first connecting portion and is press-connected to the ground terminal of the first terminal set, and the latch plate includes an insertion plate, a through hole for glue filling penetrating the insertion plate, a latch groove exposed to a lateral outer side of the insulating body, and a material strap connecting portion.

8. The high-frequency large-current USB socket according to claim 7, wherein the ground terminal of the second terminal set has an avoiding groove at a first connecting portion corresponding to the latch plate and the shielding plate to electrically isolate the latch plate from the shielding plate.

9. The high-frequency large-current USB socket according to claim 8, wherein the first terminal module further includes a first insulator integrally holding the first terminal group, the shield plate, and the latch plate, the first insulator has a contact groove formed in a lower middle portion thereof, a lower surface of the power terminal of the first terminal group is exposed to the contact groove, and the conductive plate is inserted into the contact groove and electrically connected to the power terminal of the first terminal group.

10. The high-frequency high-current USB socket according to claim 9, wherein the second terminal module further includes a second insulator integrally holding the first terminal set, an exposure slot corresponding to the contact slot is formed on an upper side surface of the second insulator, an upper surface of the power terminal of the second terminal set is exposed in the exposure slot, and after the first terminal module and the second terminal module are stacked, the conductive sheet is electrically contacted with the power terminal of the second terminal set so that the conductive sheet connects the four power terminals of the first terminal set and the second terminal set.