Patent Application
20240297449
Embodiments of this application relate to the field of cable connector technologies, and in particular, to a cable connector, a cable connector assembly, a circuit board assembly, and an electronic device.
As a mainstream link of a serial-to-parallel conversion circuit, SERializer DESerializer (Serdes), of a communication device evolves to a rate of 112 G+ or a higher rate, there is an increasingly strict requirement on a link loss of a high-speed link, and a wiring loss on a circuit board such as a printed circuit board (PCB) is obviously higher than that on a high-speed cable (cable). Therefore, in an increasing number of designs, conventional circuit board wiring is replaced with cable wiring.
Currently, a circuit board is electrically connected to a cable connector, and one end of a cable is electrically connected to the cable connector, so that the cable is led out from the circuit board, and the circuit board is electrically connected to an external circuit or a component through the cable. The cable connector is provided with a signal terminal, a head of the signal terminal is in electrical contact with a pin such as a pad on the circuit board, and a tail of the signal terminal is electrically connected to one end of the cable, so that the cable is electrically connected to the pin on the circuit board through the signal terminal. In the conventional technology, a portion that is close to the head of the signal terminal is a bent portion, and the bent portion extends along a surface of the circuit board. In this way, when the cable connector is assembled on the circuit board, the bent portion is squeezed, so that the head of the signal terminal is closely pressed against the pin under a pre-tightening force.
However, in the cable connector, the head of the signal terminal cannot be stably pressed against the corresponding pin on the circuit board.
Embodiments of this application provide a cable connector, a cable connector assembly, a circuit board assembly, and an electronic device. One end of the cable connector can be stably pressed against a corresponding pin on a circuit board, to ensure a reliable electrical connection between the cable connector and the circuit board.
According to an aspect, an embodiment of this application provides a cable connector, including a plurality of signal pair units that are disposed at intervals.
Each signal pair unit includes two signal terminals that are disposed in parallel, a first end of each signal terminal is configured to be in electrical contact with a corresponding pin on a circuit board, and a second end of each signal terminal is configured to electrically connect to a corresponding cable.
A bent portion is formed on each signal terminal in an extension direction of the signal terminal, and there is a specific distance between the bent portion and the first end.
According to the cable connector provided in this embodiment of this application, in the signal pair unit, the bent portion of the signal terminal is disposed at the specific distance from the first end of the signal terminal. In other words, the bent portion of the signal terminal is adjusted by a distance in a direction toward the second end, so that a portion of the signal terminal close to the first end is consistent with a main extension direction of the signal terminal, that is, there is no bent portion in another direction. In this way, when the cable connector is assembled on the circuit board, the first end of the signal terminal and the portion close to the first end may be disposed perpendicular to the circuit board, to avoid that the portion close to the first end of the signal terminal occupies space of the circuit board in a pin arrangement direction. An extension length of the bent portion in a direction perpendicular to the main extension direction of the signal terminal may be increased, to improve elasticity of the signal terminal in the extension direction, and ensure reliable contact between the first end of the signal terminal and the pin on the circuit board, without occupying surface space of the circuit board for contacting a mating surface of the signal terminal. In this way, a spacing between adjacent signal terminals of the cable connector can be reduced, so that the cable connector becomes a high-speed high-density cable connector, and the cable connector is applicable to a circuit board with high-density pins.
In addition, the signal terminal in the signal pair unit is disposed to have the foregoing structure, so that when the first end of the signal terminal is pressed against and fits the pin on the circuit board, the first end of the signal terminal is compressed in a direction perpendicular to the circuit board, and does not slide in a direction parallel to the circuit board, that is, does not slide on the mating surface. In this way, stable contact between the first end of the signal terminal and the pin on the circuit board can be ensured. In this way, when the signal terminal is electrically connected to the pin through a pad, a cross-sectional size of the pad can be reduced, to ensure stable impedance between the signal terminal and the pin. In addition, the signal terminal in this embodiment of this application does not need to occupy a size of the mating surface, so that appropriate space is provided for a shielding member of the cable connector, a reference ground of the circuit board, and a connection structure between the two, to ensure a shielding function of the first end of the signal terminal, and improve anti-crosstalk performance of the signal terminal. In addition, in the conventional technology, an arc hook is disposed at the first end of the signal terminal, to avoid damage to the pad on the pin when the signal terminal slides along the mating surface. Compared with the conventional technology, in this embodiment of this application, the portion of the signal terminal close to the first end does not have a bent portion, the first end of the signal terminal is perpendicularly pressed against the pin such as the pad on the circuit board, and there is no sliding trend along the mating surface. Therefore, the first end of the signal terminal has no hook. This reduces a signal loss at the first end of the signal terminal, and ensures performance of transmitting a high-speed signal by the signal pair unit.
In a feasible implementation, the bent portion is provided with a plurality of portions in the extension direction of the signal terminal. In the plurality of portions, two adjacent portions have different bending directions. In this way, elasticity of the bent portion in the extension direction of the signal terminal can be enhanced, so that the first end of the signal terminal can be stably pressed against the pin on the circuit board, and it can be ensured that the bent portion does not occupy a horizontal size of the mating surface between the cable connector and the circuit board.
In a feasible implementation, the cable connector further includes a conductive housing, and the conductive housing is configured to electrically connect to the reference ground of the circuit board; and
In this embodiment of this application, the conductive housing is disposed in the cable connector, and the shielding cavities that are independent of each other are provided in the conductive housing. In this way, each signal pair unit is accommodated in the corresponding shielding cavity, and the conductive housing is electrically connected to the reference ground of the circuit board, so that the conductive housing has a function of shielding against a signal, to effectively keep the signal pair units from radiating high-speed signal waves to the outside and affecting stability of signal transmission of the signal pair units. Therefore, anti-crosstalk performance of the signal pair units in the cable connector is improved.
In a feasible implementation, a distance between the bent portion and the inner wall of the corresponding shielding cavity remains equal in an extension direction of the bent portion. This ensures consistent characteristic impedance of the bent portion in the extension direction, so that performance of the cable connector in transmitting a high-speed signal is improved.
In a feasible implementation, the conductive housing is provided with a plurality of first avoidance openings at one end, and the plurality of first avoidance openings are provided corresponding to the plurality of shielding cavities. Each first avoidance opening is connected to the corresponding shielding cavity, and each first avoidance opening is configured to allow the first end of the corresponding signal terminal to penetrate out of the shielding cavity, so that the first end of the signal terminal is in electrical contact with the pin on the circuit board.
In a feasible implementation, the cable connector further includes a plurality of first insulating members, and the plurality of first insulating members are disposed corresponding to the plurality of signal pair units.
Each first insulating member is disposed between the corresponding signal terminal and an inner wall of the first avoidance opening.
In this embodiment of this application, the first insulating member is disposed between each signal terminal and the inner wall of the first avoidance opening, to fasten each signal terminal, and ensure that the first end of the signal terminal can be stably pressed against the pin on the circuit board. In addition, the first insulating member is disposed to ensure effective insulation between the first end of the signal terminal and the conductive housing, keep the signal terminal from being short-circuited, and keep the signal terminal from shaking in a direction parallel to the mating surface to contact the conductive housing.
In a feasible implementation, the cable connector further includes a plurality of second insulating members, and the plurality of second insulating members are disposed corresponding to the plurality of signal pair units.
Each second insulating member is disposed between the corresponding signal pair unit and the inner wall of the shielding cavity, and each second insulating member is disposed close to the second end of the signal terminal.
In this embodiment of this application, the second insulating member is disposed at a position of the signal terminal close to the second end, and the second insulating member is disposed between the signal pair unit and the inner wall of the shielding cavity, to ensure effective insulation between each signal terminal of the signal pair unit and the conductive housing, and avoid a short circuit between the signal terminal and the conductive housing. In addition, the second insulating member is disposed to improve stability of the signal pair unit in the shielding cavity, and keep the signal pair unit from shaking in an extension direction perpendicular to the signal terminal. This improves stability of electrical contact between the signal terminal of the signal pair unit and the pin on the circuit board, and keeps the signal terminal from contacting the conductive housing in a shaking process.
In a feasible implementation, a connection part between the second end of the signal terminal and the cable is located in the shielding cavity, and the second insulating member is at least partially located between the connection part and the inner wall of the shielding cavity, to protect a connection part between the cable and the signal terminal. For example, when the cable is connected to the signal terminal in a soldering manner, the second insulating member may protect a solder joint, to avoid a case such as a break at the solder joint.
In a feasible implementation, each cable is at least partially located in the corresponding shielding cavity.
Each cable includes a cable core, an insulation layer, and a conductive layer that are sequentially sleeved from the inside to the out.
The cable connector further includes a conductive medium, and the conductive medium is filled between the conductive layer and the inner wall of the shielding cavity.
In this embodiment of this application, the conductive medium is filled between the conductive layer of the cable and the shielding cavity. In one aspect, the conductive layer of the cable may be electrically connected to the conductive housing. In this way, when the conductive housing is electrically connected to the reference ground of the circuit board, the conductive layer of the cable, the conductive housing, and the reference ground of the circuit board form a good ground return current system, to improve an external shielding function of the cable connector and the cable, avoid mutual crosstalk between the cable connector and an external signal and between the cable and the external signal, and also avoid signal crosstalk between the signal pair units inside the cable connector.
In a feasible implementation, the cable connector further includes a ground contact member.
The ground contact member is disposed on a side, of the conductive housing, that is close to the first end of the signal terminal, one side of the ground contact member is electrically connected to the conductive housing, and the other side of the ground contact member is configured to electrically connect to the reference ground of the circuit board.
The ground contact member is provided with a plurality of second avoidance openings, and each second avoidance opening is configured to allow the corresponding signal terminal to pass through.
In this embodiment of this application, a ground contact member is disposed on a side, of the conductive housing, that is close to the first end of the signal terminal, so that the conductive housing is electrically connected to the reference ground of the circuit board by the ground contact member, to ensure signal shielding effect of the conductive housing.
In a feasible implementation, an elastic member is provided on the ground contact member, and an elastic direction of the elastic member is consistent with the extension direction of the signal terminal. In this way, when the cable connector is electrically connected to the circuit board, the ground contact member may be squeezed by the conductive housing and the circuit board, so that the ground contact member can be in close electrical contact with the reference ground of the circuit board under a pre-tightening force of the elastic member, to ensure a reliable electrical connection between the conductive housing and the reference ground of the circuit board.
In a feasible implementation, the elastic member is configured as an elastic arm, an extension direction of the elastic arm is perpendicular to the extension direction of the signal terminal, one end of the elastic arm is connected to the ground contact member, and the other end of the elastic arm is configured to electrically connect to the reference ground of the circuit board.
The elastic member is disposed as the elastic arm. In one aspect, tightness of electrical contact between the ground contact member and the reference ground of the circuit board is ensured. In another aspect, the elastic arm is disposed to improve stability of a connection between the elastic member and the ground contact member, and also simplify a structure of the elastic member.
In a feasible implementation, the elastic arm is at least partially disposed in the first avoidance opening, to appropriately use space in the second avoidance opening. This avoids that the elastic arm occupies a space size of a side of the ground contact member opposite to the conductive housing, that is, the mating surface, and avoids that the elastic arm causes interference to the signal terminal, to avoid affecting electrical contact between the signal terminal and the pin on the circuit board.
In a feasible implementation, the ground contact member is configured as an elastic buffer. In this way, when the cable connector is electrically connected to the circuit board, the ground contact member is compressed by using an elastic function of the ground contact member, so that the ground contact member generates an elastic force perpendicular to the circuit board, to ensure that the ground contact member is in close contact with the reference ground of the circuit board, and ensure reliable grounding of the conductive housing.
In a feasible implementation, a convex rib is provided on a side, of the conductive housing, that faces the ground contact member, and the convex rib is pressed against the ground contact member.
The convex rib is disposed on the side, of the conductive housing, that faces the ground contact member, so that when the cable connector is assembled with the circuit board, the convex rib can squeeze the ground contact member, to increase a compression amount of an elastic material at a corresponding position of the ground contact member. In this way, contact between a position of the convex rib corresponding to the ground contact member and the reference ground of the circuit board is closer.
In a feasible implementation, the conductive housing is further provided with an accommodating groove, the accommodating groove is located in a side, of all the shielding cavities, that is opposite to the first avoidance opening, and each cable is further partially located in the accommodating groove;
According to another aspect, an embodiment of this application further provides a cable connector assembly, including a plurality of cables and the foregoing cable connector.
In the cable connector, each signal terminal of a signal pair unit is electrically connected to the corresponding cable.
In this embodiment of this application, the cable connector is disposed in the cable connector assembly. An extension length of a bent portion in the signal terminal in a direction perpendicular to a main extension direction of the signal terminal is adjusted, to improve elasticity of the signal terminal in the main extension direction, and ensure reliable contact between a first end of the signal terminal and a pin on the circuit board, so that a reliable electrical connection between the cable connector assembly and the pin on the circuit board is ensured. In addition, the signal terminal of the cable connector assembly does not occupy surface space of the circuit board for contacting a mating surface of the signal terminal. In this way, the cable connector is applicable to a circuit board with high-density pins.
In a feasible implementation, the cable includes a cable core, an insulation layer, and a conductive layer that are sequentially disposed from the inside to the out.
One end of the cable core is electrically connected to the corresponding signal terminal, and the conductive layer is electrically connected to a conductive housing of the cable connector.
In this embodiment of this application, the conductive layer of the cable is electrically connected to the conductive housing. When the conductive housing is electrically connected to the reference ground of the circuit board, the conductive layer of the cable, the conductive housing, and the reference ground of the circuit board form a good ground return current system, to improve an external shielding function of the cable connector assembly, avoid mutual crosstalk between the cable connector and an external signal and between the cable and an external signal, and also avoid signal crosstalk between the signal pair units inside the cable connector.
In a feasible implementation, the cable further includes a cable insulator.
The cable insulator is disposed on a periphery of one end of the cable core connected to the signal terminal, so that one end of the cable core is separated from an inner side wall of the conductive housing by using the cable insulator, to avoid a short circuit caused by electrical contact between a connection part such as a solder joint between the cable core and the signal terminal and an inner wall of the conductive housing.
According to still another aspect, an embodiment of this application further provides a circuit board assembly, including a circuit board and the foregoing cable connector assembly.
A signal terminal of the cable connector assembly is in electrical contact with a corresponding pin on the circuit board, and a first end of the signal terminal is at least partially perpendicular to the circuit board.
In this embodiment of this application, the cable connector assembly is disposed in the circuit board assembly, so that a portion of the signal terminal close to the first end in the cable connector assembly does not occupy space of the circuit board in a pin arrangement direction. An extension length of a bent portion in a direction perpendicular to a main extension direction of the signal terminal may be adjusted, to improve elasticity of the signal terminal in the main extension direction, and ensure reliable contact between the first end of the signal terminal and a pin on the circuit board, so that a reliable electrical connection between the cable and the pin on the circuit board is ensured. The portion of the signal terminal close to the first end does not occupy surface space of a mating surface of the circuit board, so that the cable connector is applicable to a circuit board with high-density pins, to ensure signal transmission performance of a high-density circuit board assembly.
In a feasible implementation, a pad is provided on a pin on the circuit board, and one end of the signal terminal is in electrical contact with the pad, to increase an electrical contact area between the signal terminal and the pin, so that electrical contact between the signal terminal and the pin is more reliable.
In a feasible implementation, the pad is provided with a groove, and the first end of the signal terminal is located in the groove.
The groove is provided in the pad, and the first end of the signal terminal is disposed in the groove, to limit movement of the first end of the signal terminal on a surface of the pad, and ensure stable contact of the first end of the signal terminal on the pad, so that stable impedance of the first end of the signal terminal is ensured. For example, when the groove is provided at the center of the pad, the first end of the signal terminal may be limited at the center of the pad, to ensure that high-speed transmission performance of the signal terminal is more stable.
In a feasible implementation, the circuit board includes any one of a substrate and a chip. For example, the signal terminal of the cable connector assembly may be electrically connected to a pin on the substrate, or may be electrically connected to a pin on the chip. In other words, the substrate may be electrically connected to a cable by the cable connector in this embodiment of this application, to improve stability of contact between the pin on the substrate and the signal terminal of the cable connector, and the signal terminal does not occupy space on a surface of the substrate, so that the cable connector is applicable to a high-density substrate. Correspondingly, the chip may also be electrically connected to the cable by the cable connector in this embodiment of this application, to improve stability of contact between a pin on the chip and a signal terminal of the cable connector, and the signal terminal does not occupy surface space of the chip for contacting a mating surface of the signal terminal, so that the cable connector is applicable to a high-density chip.
Terms used in embodiments of this application are merely used to explain specific embodiments of this application, but are not intended to limit this application.
An embodiment of this application provides an electronic device, including a circuit board assembly (with reference to
It should be noted that the electronic device in this embodiment of this application may include but is not limited to a fixed terminal or a mobile terminal having a circuit board assembly, for example, a mobile phone, a tablet computer, a notebook computer, an ultra-mobile personal computer (UMPC), a handheld computer, a touch television, an intercom, a netbook, a POS machine, a personal digital assistant (PDA), a wearable device, or a virtual reality device.
The electronic device provided in this embodiment of this application may be an electronic device having a network communication function. A mainstream SerDes link inside the electronic device evolves to a rate of 112 G+ or a higher rate, and there is an increasingly strict requirement on a link loss of a high-speed link. Based on this, refer to
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For example, refer to
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In this embodiment of this application, a specific structure of the cable connector assembly 200 is described in detail by using an example in which the cable connector assembly 200 is connected to the substrate 110.
Refer to
A length direction of each lead region 100a on the substrate 110 is an x direction, a width direction is a y direction, and a height direction is a z direction.
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It should be noted that one end and the other end of the signal terminal 2111 are two ends of the signal terminal 2111 that are disposed opposite to each other in an extension direction (with reference to the z direction in
It may be understood that the extension direction of the signal terminal 2111 is a direction from the first end to the second end of the signal terminal 2111. In other words, after the cable connector assembly 200 is electrically connected to the circuit board 100, for example, the substrate 110, the extension direction of the signal terminal 2111 is a direction of the signal terminal 2111 from the cable 220 to the substrate 110, as shown by the z direction in
A surface that is on the substrate 110 and that is configured to be cooperatively connected to the cable connector 210 or the cable connector assembly 200 may be referred to as a mating surface 112 (with reference to
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Certainly, m in this embodiment of this application may be any value greater than or less than 8. For example, m may be 5, 3, 12, 15, or the like. Correspondingly, n may also be any value greater than or less than 8. For example, n may be 25, 15, 40, 50, or the like.
Refer to
In the cable connector assembly 200, each signal terminal 2111 of the cable connector 210 is electrically connected to the corresponding cable 220, so that the cable 220 is electrically connected to the corresponding pad 111 on the substrate 110 by the corresponding signal terminal 2111, to lead out the cable 220 from each pin on the substrate 110.
Refer to
In some examples, one cable core 221 may be provided in each cable 220. In this way, each signal terminal 2111 is electrically connected to one cable 220. In other words, one signal terminal 2111 is connected to one cable 220. In the cable connector assembly 200, a quantity of signal terminals 2111 is consistent with a quantity of cables 220, so that one cable 220 is led out from one pin on the circuit board 100, for example, the substrate 110.
Refer to
The circuit board 100 in this embodiment of this application is a high-density circuit board. For example, in each lead region 100a of the substrate 110, a maximum spacing (as shown by d1 in
Generally, in the plurality of pads 111 arranged in an array on the circuit board 100, a spacing between two adjacent rows of pads 111 is large, and a spacing between two adjacent pads 111 in each row of pads 111 is small. Therefore, generally, a maximum spacing between two adjacent rows of pads 111 is 0.6 mm, and a spacing between two adjacent pads 111 in each row of pads 111 is generally less than 0.6 mm.
It should be noted that the spacing between two adjacent pads 111 is a distance between centers of the two adjacent pads 111. During actual application, the spacing between two adjacent pads 111 may be referred to as a pitch.
Refer to
It should be noted that the spacing d2 between the two adjacent unit pad regions 110a is a distance between centers of the two adjacent unit pad regions 110a.
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Still refer to
In the conventional technology, the bent portion 11b of the signal terminal 11 may be used as an elastic arm of the signal terminal 11. When the cable connector 1 is assembled on the circuit board 100, the mating surface 112 of the circuit board 100 and another component of the cable connector 1 squeeze the elastic arm, and the elastic arm generates an elastic force, so that the first end of the signal terminal 11 is stably pressed against the pad 111 of the circuit board 100 under a pre-tightening action of the elastic force. Therefore, more reliable electrical contact between the signal terminal 2111 and the pad 111 is ensured, and it is ensured that the signal terminal 2111 is electrically connected to the corresponding pin stably.
Refer to
When the bent portion 11b of the signal terminal 11 is bent in the y direction, the bent portion 11b has a component in the y direction. In this way, when an extension length of the bent portion 11b is larger, the component in the y direction is larger, that is, an extension length of the mating surface 112 parallel to the circuit board 100 is larger. In other words, when the extension length of the bent portion 11b is larger, a space size occupied by the bent portion 11b in an arrangement direction of the pads 111 is larger. When a length of the bent portion 11b in the extension direction is longer, a pre-tightening force, that is, an elastic force, of the bent portion 11b is larger, so that when the cable connector 1 is assembled on the circuit board 100, one end of the signal terminal 11 can be stably pressed against a corresponding pad 111 on the circuit board 100.
However, because pin density of the circuit board 100 is high, that is, a spacing between two adjacent pins is small, and correspondingly, a spacing between the pads 111 corresponding to the two adjacent pins is also small. An extension length of the bent portion 11b in the signal terminal 11 is greatly limited, and elasticity of the signal terminal 11 is limited. As a result, when the cable connector 1 is electrically connected to the circuit board 100, one end of the signal terminal 11 cannot be stably pressed against the pin, for example, the pad 111, of the circuit board 100.
According to the cable connector 210 provided in this embodiment of this application, in the signal pair unit 211, the bent portion 211b of the signal terminal 2111 is disposed at the specific distance from the first end of the signal terminal 2111. In other words, the bent portion 211b of the signal terminal 2111 is moved up by a distance in a direction toward the second end, so that a portion of the signal terminal 2111 close to the first end is consistent with a main extension direction of the signal terminal 2111, that is, there is no bent portion 211b in another direction. In this way, when the cable connector 210 is assembled on the circuit board 100, the first end of the signal terminal 2111 and the portion close to the first end may be disposed perpendicular to the circuit board 100, to avoid that the portion close to the first end of the signal terminal 2111 occupies space of the circuit board 100 in a pin arrangement direction. An extension length of the bent portion 211b in a direction perpendicular to the main extension direction of the signal terminal 2111 may be adjusted, to improve elasticity of the signal terminal 2111 in the extension direction, and ensure reliable contact between the first end of the signal terminal 2111 and the pin on the circuit board 100 without occupying surface space of the circuit board 100 for contacting a mating surface 112 of the signal terminal 2111, so that the cable connector 210 becomes a high-density cable connector 210, and is applicable to a circuit board 100 with high-density pins.
The following describes in detail a specific structure of the cable connector 210 in this embodiment of this application with reference to the accompanying drawings.
Each signal terminal 2111 includes a first end and a second end that are disposed opposite to each other in an extension direction. The first end of each signal terminal 2111 is configured to electrically connect to a corresponding pin on the circuit board 100. For example, the first end of each signal terminal 2111 is in electrical contact with the pad 111 on the pin (with reference to
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There is a specific distance (with reference to d3 in
For example, each signal terminal 2111 includes a first main body portion 211a, a bent portion 211b, and a second main body portion 211c that are sequentially connected in the extension direction. One end of the first main body portion 211a is used as the second end of the signal terminal 2111, and is electrically connected to the corresponding cable 220, the other end of the first main body portion 211a is connected to one end of the bent portion 211b, one end of the second main body portion 211c is electrically connected to the other end of the bent portion 211b, and the other end of the second main body portion 211c is used as the first end of the signal terminal 2111, and is electrically connected to the corresponding pin on the circuit board 100. For example, the other end of the second main body portion 211c is in electrical contact with a corresponding pad 111 on the circuit board 100, for example, the substrate 110 (with reference to
Refer to
It may be understood that the bent portion 211b may be a plurality of planar structures that are sequentially connected. For example, the bent portion 211b may be one or more triangular structures, quadrilateral structures, or the like. The plurality of triangular structures are sequentially disposed in the z direction. In some examples, the bent portion 211b may also have an arc-shaped structure (with reference to
Extension directions of the first main body portion 211a and the second main body portion 211c are consistent with the extension direction of the signal terminal 2111. An extension length of the second main body portion 211c is d3. In other words, compared with the signal terminal 2111 in the conventional technology, in this embodiment of this application, the bent portion 211b of the signal terminal 2111 is moved up by a distance of d3 in a direction toward the second end. d3 is a value greater than 0. For example, d3 may be an appropriate value such as 0.5 mm, 1 mm, 1.5 mm, or 2 mm.
In this embodiment of this application, the bent portion 211b of the signal terminal 2111 is moved up by a distance in a direction toward the second end, so that an extension direction of at least a part of the signal terminal 2111 close to the first end is consistent with the extension direction of the signal terminal 2111, that is, the portion is not bent in another direction. In this way, when the cable connector 210 is assembled on the circuit board 100, for example, the substrate 110, the portion of the signal terminal 2111 close to the first end, for example, the second main body portion 211c may be disposed perpendicular to the substrate 110 (as shown in
It should be noted that, that the second main body portion 211c of the signal terminal 2111 is perpendicular to the circuit board 100 may be that an included angle between the second main body portion 211c and the circuit board 100 is 90°, or 90°±10°. In other words, the second main body portion 211c of the signal terminal 2111 may be completely perpendicular to the circuit board 100, or may be tilted about 100 to the left or right.
Based on this, an extension length of the bent portion 211b in the direction perpendicular to the extension direction of the signal terminal 2111 may be increased, that is, a maximum distance d4 of the bent portion 211b that deviates from the extension direction of the signal terminal 2111 may be increased, so that elasticity of the signal terminal 2111 in the extension direction is improved, reliable contact between the first end of the signal terminal 2111 and the pad 111 on the circuit board 100 is ensured without occupying surface space of the circuit board 100 for contacting the mating surface 112 of the signal terminal 2111. A spacing between two adjacent signal terminals 2111 in the cable connector 210 may be reduced, to form a high-density and high-speed cable connector 210, so that the cable connector 210 may be applicable to the circuit board 100 with high-density pins, and a reliable electrical connection between the signal terminal 2111 of the cable connector 210 and a pin on the circuit board 100 can be ensured.
In the high-density and high-speed cable connector 210, the high speed is an application scenario in which a rate exceeds 56 Gbps, and the high density is an application scenario in which a spacing between two adjacent unit pad regions 110a on the circuit board 100 is less than or equal to 1.5 mm×1.8 mm.
In addition, the signal terminal 2111 in the signal pair unit 211 is disposed to have the foregoing structure, so that when the first end of the signal terminal 2111 is pressed against and fits the pad 111 on the circuit board 100, the first end of the signal terminal is compressed in a direction perpendicular to the circuit board 100, and does not slide in a direction parallel to the circuit board 100, that is, does not slide on the mating surface 112 or a sliding distance is controlled within 0.1 mm. In this way, stable contact between the first end of the signal terminal 2111 and the pad 111 on the circuit board 100 can be ensured. In this way, when the signal terminal 2111 is electrically connected to the pin through the pad 111, a cross-sectional size of the pad 111 can be reduced, to ensure stable impedance between the signal terminal 2111 and the pin.
In addition, the signal terminal 2111 in this embodiment of this application does not need to occupy a size of the mating surface 112, so that appropriate space is provided for a shielding member of the cable connector 210, a reference ground of the circuit board 100, and a connection structure between the two, to ensure a shielding function of the first end of the signal terminal 2111, and improve anti-crosstalk performance of the signal terminal 2111.
In addition, in the conventional technology, an arc hook is disposed at the first end of the signal terminal 2111, to avoid damage to the pad 111 on the pin when the signal terminal 2111 slides along the mating surface. Compared with the conventional technology, in this embodiment of this application, the portion of the signal terminal 2111 close to the first end does not have a bent portion 211b, the first end of the signal terminal 2111 is perpendicularly pressed against the pin such as the pad 111 of the circuit board 100, and there is no sliding trend along the mating surface. Therefore, the first end of the signal terminal 2111 has no hook. This reduces a signal loss at the first end of the signal terminal 2111, and ensures performance of transmitting a high-speed signal by the signal pair unit 211.
Refer to
Correspondingly, an extension length of the first main body portion 211a may be adjusted according to an actual length of the signal terminal 2111, which is not limited herein, provided that it is ensured that one end of the first main body portion 211a away from the bent portion 211b can be reliably connected to the corresponding cable 220.
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In the foregoing example, each portion of the bent portion 211b may have a polygonal structure or an arc structure. For example, the first portion A and the second portion B may have a triangular structure or an arc structure. When the first portion A and the second portion B have an arc structure, the bent portion 211b formed by the first portion A and the second portion B has a wave-shaped bent structure or a snake-shaped structure, that is, the bent portion 211b may form a wavy structure or a snake-shaped structure.
It may be understood that, in the foregoing example, each portion of the bent portion 211b extends in a same plane. For example, refer to
In another example, each portion of the bent portion 211b may extend in different planes, that is, different regions of each portion in the extension direction are located in different planes. For example, the first portion A extends in the yoz plane, and the second portion B extends on an xoz plane, so that the bent portion 211b forms a spiral structure.
A structure of the bent portion 211b is not specifically limited in this embodiment of this application, provided that it is ensured that the bent portion 211b protrudes in the direction perpendicular to the extension direction of the signal terminal 2111.
The conductive housing 212 is made of a conductive material such as plastic electroplating or conductive plastic. For example, the conductive housing 212 may be integrally formed by using a process such as powder metallurgy, machining, or die casting.
Refer to
Specifically, as shown in
Compared with the conventional technology in which a stamping member is disposed between a tail and a head of the signal terminal 11, and the stamping member is used to implement an electrical connection between the cable connector 1 and the reference ground of the circuit board 100, in this embodiment of this application, a structure of an electrical connection between the cable connector 210 and the reference ground of the circuit board 100 is also simplified by arranging the conductive housing 212, to facilitate manufacturing of the cable connector 210.
Refer to
Refer to
It may be understood that an extension direction of each shielding cavity 2121 is consistent with the extension direction of the signal terminal 2111. For example, the extension direction of each shielding cavity 2121 may be the z direction.
Refer to
For example, if the bent portion 211b of the signal terminal 2111 is an arc-shaped structure protruding in the y direction, an inner wall of a position of the corresponding shielding cavity 2121 corresponding to the bent portion 211b is also an arc-shaped surface protruding in the y direction (as shown by M in
Refer to
For example, an inner bottom wall of each shielding cavity 2121 of the conductive housing 212 close to the first end of the signal terminal 2111 is provided with a first avoidance opening 2122. The first avoidance opening 2122 is configured to connect each shielding cavity 2121 to the outside of the conductive housing 212. In this way, the first end of the signal terminal 2111 of each signal pair unit 211 may extend from the corresponding first avoidance opening 2122, and is in electrical contact with a corresponding pin, for example, the pad 111, on the circuit board 100.
For example, refer to
During specific arrangement, the signal pair unit 211 may be first directly inserted into the corresponding shielding cavity 2121, and the first end of each signal terminal 2111 passes through the first avoidance opening 2122 at one end of the shielding cavity 2121, and then an insulating medium is filled between each first avoidance opening 2122 and the signal terminal 2111, to fasten each signal terminal 2111, and ensure that the first end of the signal terminal 2111 can be stably pressed against the pad on the circuit board 100. It may be understood that, the insulating medium is used as the first insulating member 215, and is filled between each first avoidance opening 2122 and the signal terminal 2111.
In addition, the first insulating member 215 is disposed to ensure effective insulation between the first end of the signal terminal 2111 and the conductive housing 212, keep the signal terminal 2111 from being short-circuited, and keep the signal terminal 2111 from shaking in a direction parallel to the mating surface to contact the conductive housing 212.
A composition material of the first insulating member 215 may include, but is not limited to, polybutylene terephthalate (PBT), polycarbonate (PC), paraformaldehyde (POM), and polyurethane (PU), and may be specifically selected according to an actual requirement.
Refer to
For example, the conductive housing 212 is provided with eight shielding cavities 2121 provided in the y direction, each shielding cavity 2121 is provided with one signal pair unit 211, and a second insulating member 216 is disposed between each signal pair unit 211 and the inner wall of the shielding cavity 2121. In other words, the second insulating member 216 effectively electrically isolates the signal pair unit 211 from the inner wall of the shielding cavity 2121, to ensure effective insulation between each signal terminal 2111 of the signal pair unit 211 and the conductive housing 212, and avoid a short circuit between the signal terminal 2111 and the conductive housing 212.
In addition, the second insulating member 216 is disposed to improve stability of the signal pair unit 211 in the shielding cavity 2121, and keep the signal pair unit 211 from shaking in an extension direction perpendicular to the signal terminal 2111, to improve stability of electrical contact between the signal terminal 2111 of the signal pair unit 211 and the pad 111 on the circuit board 100, and keep the signal terminal 2111 from contacting the conductive housing 212 in a shaking process.
Refer to
Refer to
At least a portion of the cable 220 configured to connect to one end of the signal terminal 2111 is provided with only a cable core 221 (as shown in
Refer to
For example, refer to
It may be understood that materials of the second insulating member 216 and the first insulating member 215 may be the same or may be different. In this embodiment of this application, composition materials of the first insulating member 215 and the second insulating member 216 are not specifically limited, provided that it is ensured that the first insulating member 215 and the second insulating member 216 perform insulation. The first insulating member 215 and the second insulating member 216 may be formed through injection molding by using an insulating material.
Still refer to
Refer to
In this embodiment of this application, the conductive medium 214 is filled between the conductive layer 223 of the cable 220 and the shielding cavity 2121. In one aspect, the conductive layer 223 of the cable 220 may be electrically connected to the conductive housing 212. In this way, when the conductive housing 212 is electrically connected to the reference ground of the circuit board 100, the conductive layer 223 of the cable 220, the conductive housing 212, and the reference ground of the circuit board 100 form a good ground return current system, to improve an external shielding function of the cable connector 210 and the cable 220, avoid mutual crosstalk between the cable connector 210 and an external signal and between the cable 220 and the external signal, and also avoid signal crosstalk between the signal pair units 211 inside the cable connector 210.
A composition material of the conductive medium 214 may be metal, an alloy, or a polymer conductive material such as conductive plastic, conductive solder, or a conductive adhesive. A specific composition of the conductive medium 214 is not specifically limited in this embodiment of this application.
Refer to
During specific arrangement, refer to
Refer to
It may be understood that the thrust member 217 is attached to a surface (as shown in
Refer to
It may be understood that the strip hole is provided to divide the thrust member 217 into a plurality of strip members, and ends of the plurality of strip members are respectively in the plurality of mounting grooves 2124 provided in the inner walls of the accommodating grooves 2123. The width of the third avoidance opening 217a, that is, the strip hole, is a width of the third avoidance opening 217a that is perpendicular to the extension direction, that is, the x direction.
It may be understood that, refer to
In this embodiment of this application, a ground contact member 218 is disposed on a side of the conductive housing 212 close to the first end of the signal terminal 2111, so that the conductive housing 212 is electrically connected to the reference ground of the circuit board 100 by the ground contact member 218, to ensure signal shielding effect of the conductive housing 212.
Still refer to
The elastic member 2181 may be a spring (not shown in the figure) disposed on a surface of the ground contact member 218, and an extension direction of the spring is consistent with a thickness direction of the ground contact member 218, that is, the extension direction of the spring is the z direction.
Refer to
The elastic member 2181 is disposed as the elastic arm. In one aspect, tightness of electrical contact between the ground contact member 218 and the reference ground of the circuit board 100 is ensured. In another aspect, the elastic arm is disposed to improve stability of a connection between the elastic member 2181 and the ground contact member 218, and also simplify a structure of the elastic member 2181.
In the plurality of elastic arms used as the elastic members 2181, some elastic arms or all the elastic arms may be disposed in the second avoidance opening 218a. For example, the second avoidance opening 218a is provided with a first inner side wall and a second inner side wall that are disposed opposite to each other. One end of the elastic arm is connected to the first inner side wall, the other end of the elastic arm extends to the second inner side wall, and the other end of the elastic arm is in contact with the reference ground of the circuit board 100, for example, the substrate 110.
The elastic arm is disposed in the second avoidance opening 218a, to appropriately use space in the second avoidance opening 218a. This avoids that the elastic arm occupies a space size of a side of the ground contact member 218 opposite to the conductive housing 212, that is, the mating surface, and avoids that the elastic arm causes interference to the signal terminal 2111, to avoid affecting electrical contact between the signal terminal 2111 and the pin on the circuit board 100.
Refer to
Refer to
The ground contact member 218 may be conductive rubber, foam, or the like.
During specific assembly, the ground contact member 218 may be tightly fastened between the conductive housing 212 and the circuit board 100 by a fastening screw or the like, so that an elastic material of the ground contact member 218 is compressed, and the conductive housing 212 is closely connected to the circuit board 100. In this way, it is ensured that the conductive housing 212 is reliably electrically connected to the reference ground on the circuit board 100, and in addition, it is ensured that the signal terminal 2111 is in close contact with the pad 111 on the circuit board 100.
The convex rib 2125 is disposed on the side of the conductive housing 212 facing the ground contact member 218, so that when the cable connector 210 is assembled with the circuit board 100, the convex rib 2125 can squeeze the ground contact member 218, to increase a compression amount of an elastic material at a corresponding position of the ground contact member 218. In this way, contact between a position of the convex rib 2125 corresponding to the ground contact member 218 and the reference ground of the circuit board 100 is closer.
A plurality of convex ribs 2125 may be disposed on a surface of one side of the conductive housing 212 in the x direction and the y direction in sequence, to increase a fitting amount between the convex rib 2125 and the ground contact member 218, so that contact performance of the ground contact member 218 and the circuit board 100 is better, and therefore, the ground contact member 218 is increased. It may be understood that the convex rib 2125 extending in the x direction and the convex rib 2125 extending in the y direction are disposed in a cross manner, and in addition, all convex ribs 2125 are disposed away from the first avoidance opening 2122.
Refer to
In addition, the fixing adhesive may play a positioning role for a portion of the cable 220, so that an end of the cable 220 close to the signal terminal 2111 is more stable in the conductive housing 212, to improve stability of a connection between the cable 220 and the signal terminal 2111.
The fixing adhesive 219 may be a conductive adhesive.
In the cable connector assembly 200 further provided in this embodiment of this application, the cable connector 210 is disposed. An extension length of a bent portion 211b in the signal terminal 2111 in a direction perpendicular to a main extension direction of the signal terminal 2111 is adjusted, to improve elasticity of the signal terminal 2111 in the main extension direction, and ensure reliable contact between a first end of the signal terminal 2111 and a pin on the circuit board 100, so that a reliable electrical connection between the cable connector assembly 200 and the pin on the circuit board 100 is ensured. In addition, the signal terminal 2111 in the cable connector assembly 200 does not occupy surface space of the circuit board 100 for contacting a mating surface of the signal terminal 2111. In this way, the cable connector 210 is applicable to a circuit board 100 with high-density pins.
In the circuit board assembly provided in this embodiment of this application, the cable connector assembly 200 is disposed in the circuit board assembly, so that a portion of the signal terminal 2111 close to the first end in the cable connector assembly 200 does not occupy space of the circuit board 100 in a pin arrangement direction. An extension length of a bent portion 211b in a direction perpendicular to a main extension direction of the signal terminal 2111 may be adjusted, to improve elasticity of the signal terminal 2111 in the main extension direction, and ensure reliable contact between the first end of the signal terminal 2111 and a pin on the circuit board 100, so that a reliable electrical connection between the cable 220 and the pin on the circuit board 100 is ensured. The portion of the signal terminal 2111 close to the first end does not occupy surface space of a mating surface of the circuit board 100, so that the cable connector 210 is applicable to a circuit board 100 with high-density pins, to ensure signal transmission performance of a high-density circuit board assembly.
Refer to
The pad 111 of a rectangular structure is used as an example. Both a length and a width of the pad 111 on the circuit board 100 in this embodiment of this application may be less than 0.4 mm, so that high-density layout of pins on the circuit board 100 can be implemented.
The groove 1111 is provided in the pad 111, and the first end of the signal terminal 2111 is disposed in the groove 1111, to limit movement of the first end of the signal terminal 2111 on a surface of the pad 111, and ensure stable contact of the first end of the signal terminal 2111 on the pad 111, so that impedance stability of the first end of the signal terminal 2111 is ensured.
For example, when the groove 1111 is provided at the center of the pad 111, the first end of the signal terminal 2111 may be limited at the center of the pad 111, to ensure more stable high-speed transmission performance of the signal terminal 2111.
In other words, the substrate 110 may be electrically connected to a cable 220 by the cable connector 210 in this embodiment of this application, to improve contact stability between the pin on the substrate 110 and the signal terminal 2111 in the cable connector 210, and the signal terminal 2111 does not occupy space on a surface of the substrate 110, so that the cable connector 210 is applicable to a high-density substrate 110. Correspondingly, the chip 120 may also be electrically connected to the cable 220 by the cable connector 210 in this embodiment of this application, to improve contact stability between a pin on the chip 120 and a signal terminal 2111 in the cable connector 210, and the signal terminal 2111 does not occupy surface space of the chip 120 for contacting a mating surface of the signal terminal 2111, so that the cable connector 210 is applicable to a high-density chip 120.
It should be noted herein that values and value ranges in embodiments of this application are approximate values, and an error within a specific range may exist due to impact of a manufacturing process. A person skilled in the art may consider that the error is negligible.
It should be understood that, in this application, “electrical connection” may be understood that components contact physically and conduct electrically. It may also be understood as a form in which different components in a line structure are connected through physical lines that can transmit an electrical signal, such as a printed circuit board (PCB) copper foil or a conducting wire. “Coupling” may be understood as conducting through air in an indirect coupling manner. The coupling in this application may be understood as capacitive coupling. For example, an equivalent capacitor is formed by coupling between gaps between two conductive members, to implement signal transmission. A person skilled in the art may understand that the coupling phenomenon is a phenomenon that input and output of two or more circuit elements or electrical networks closely fit each other and affect each other, and energy is transmitted from one side to the other side through interaction. A “communication connection” may refer to an electrical signal transmission, including a wireless communication connection and a wired communication connection. The wireless communication connection does not require a physical medium and does not belong to a connection relationship that defines a construction of a product. Both “connection” and “connected to” may refer to a mechanical connection relationship or a physical connection relationship. That is, a connection between A and B or that A is connected to B may mean that there is a fastening component (for example, a screw, a bolt, a rivet, or the like) between A and B; or A and B are in contact with each other and A and B are difficult to be separated.
In descriptions of embodiments of this application, it should be noted that, unless otherwise clearly specified and limited, the terms “installation”, “connection to”, and “connection” should be understood in a broad sense. For example, the connection may be a fixed connection, may be an indirect connection by using an intermediate medium, or may be an internal connection between two elements or an interaction relationship between two elements. For a person of ordinary skill in the art, specific meanings of the foregoing terms in embodiments of this application may be understood based on a specific situation.
In the specification, claims, and accompanying drawings in embodiments of this application, the terms “first”, “second”, “third”, “fourth”, and so on (if available) are intended to distinguish between similar objects but do not necessarily indicate a specific order or sequence.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202111332113.8 | Nov 2021 | CN | national |
This application is a continuation of International Application No. PCT/CN2022/108033, filed on Jul. 26, 2022, which claims priority to Chinese Patent Application No. 202111332113.8, filed on Nov. 11, 2021. The disclosures of the aforementioned applications are hereby incorporated by reference in their entireties.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/CN2022/108033 | Jul 2022 | WO |
| Child | 18660345 | US |
