Patent Application
20250079045
The present patent application claims the priority of Japanese patent application No. 2023-142524 filed on Sep. 1, 2023, and the entire contents thereof are hereby incorporated by reference.
This disclosure relates to communication cables and communication cable assemblies.
In recent years, transmission cables that can reduce costs and improve transmission characteristics have been proposed (see, for example, Patent Literature 1).
The USB (Universal Serial Bus) standard, one of the interface standards, has been developed in various ways, and the maximum transfer rate has been improved. For example, USB 1.0 and USB 1.1 have a maximum transfer rate of 12 Mbps. USB2.0 has a maximum transfer rate of 480 Mbps, USB3.0 has a maximum transfer rate of 5 Gbps, and USB3.1 has a maximum transfer rate of 10 Gbps, and USB3.2 has a maximum transfer rate of 20 Gbps. On the other hand, for connectors, Type-A and Type-B connectors have been specified, but Type-C, which has a reversible connector, is specified for USB 3.1 and later.
In addition, USB cables have become capable of various types of communication with a single cable. This has led to an increase in the complexity of the core wire configuration and the number of cores. For example, it is recommended that USB 2.0 has four cores, USB 3.0 has eight cores, and USB Type-C has fifteen cores.
The transmission cable described in Patent Literature 1 is a transmission cable compliant with the USB Type-C standard. This transmission cable is a 17-core cable that includes eight coaxial wires (for 10 Gbps transmission), four signal wires (a first SBU wire, a second SBU wire, a configuration channel (CC) wire, and a Vconn wire), one power wire, two ground wires, and a pair of twisted pair wires.
Conventional transmission cables compliant with the USB Type-C standard are mainstream in many countries as charging cables for smartphones. In addition, there is a movement to adopt the USB Type-C standard as power cables and communication cables not only for smartphones but also for PCs, other communication devices, and imaging devices. This is thought not to standardize cable characteristics but to unify connector plugs (mating parts) and receptacles of devices to be connected to increase convenience. On the other hand, the USB Type-C standard defines specifications for both the cable and the connector. The cable outer diameter (cable diameter) is also limited due to the size of the USB Type-C standard-compliant connector board. Therefore, the conductor cross-sectional area of each core wire cannot be increased, and the communication quality deteriorates when the cable length is long.
Therefore, an object of the present invention is to provide a communication cable and communication cable assembly that can be used with reversible plugs that can be inserted into a receptacle even when the front and back sides of the plug are reversed, and that can achieve longer communication distance (i.e. communication range) relative to the cable diameter.
For solving the above problem, the first aspect provides a communication cable, comprising two first differential pair wires for transmitting high-speed differential signals; a second differential pair wire for transmitting low-speed differential signals; a power wire; a ground wire; and a configuration channel wire for detecting front and back orientation of a plug, wherein the communication cable is devoid of other first differential pair wires than the two first differential pair wires.
The second aspect provides the communication cable further comprising a power wire for a circuit in the plug.
The third aspect provides the communication cable, wherein signal wires constituting each of the first differential pair wires have a conductor at a center and an insulation layer covering the conductor, and wherein a ratio of a conductor diameter of the conductor to a cable diameter is 0.06 or more and 0.07 or less.
The fourth aspect provides the communication cable according to the third aspect, wherein a ratio of a communication distance of the high-speed differential signals to the cable diameter is 800 or more.
The fifth aspect provides the communication cable, wherein a number of core wires is 9 or more and 14 or less.
The sixth aspect provides a communication cable assembly, comprising the communication cable according to the first aspect, wherein the plug comprises a pair of plugs electrically connected to both terminals of the communication cable.
The first and fifth aspects of the invention enable the use of a reversible plug that can be plugged into a receptacle even when the front and back are reversed, thereby extending the communication distance relative to the cable diameter.
The second aspect of the invention enables high-speed charging of devices by using an IC chip (eMarker) as a circuit in the plug.
The third and fourth aspects can increase the communication distance if the cable diameter is the same as that of the conventional cable.
Next, the embodiments will be described with reference to the appended drawings. In each of the figures, the same symbols are used for components that have substantially the same functions in the figures, and redundant descriptions are omitted.
The communication cable 1 is a 9-core cable with a reduced number of cores compared to the core wire configuration of a cable compliant with the USB Type-C standard. In other words, a cable compliant with the USB Type-C standard has four pairs of high-frequency signal wires (SSTX1 wire, SSRX1 wire, SSTX2 wire, and SSRX2 wire), but this communication cable 1 has only two pairs of high-frequency signal wires (e.g., SSTX1 wire, SSRX1 wire).
In addition, a conventional cable compliant with the USB Type-C standard includes the signal wires (SBU1 wire, SBU2 wire) for the alternate mode (HDM (registered trademark) DisplayPort, etc.). However, this communication cable 1 has no alternate mode. In other words, this communication cable 1 does not include the signal wires (SBU1 and SBU2 wires), or it is specialized for USB signals. The signal wires (SBU1 and SBU2) may be added as necessary.
The above configuration reduces the number of core wires, and when the cable diameter is the same as the conventional cable compliant with the USB Type-C standard, the conductor diameters of the SSTX1 and SSRX1 wires can be increased, thereby extending the communication distance. In other words, the communication distance can be increased in relation to the cable diameter. In addition, the USB Type-C compliant CC wires can be left as they are, which allows the USB Type-C compliant CC wires to be connected to a USB Type-C compliant connector, i.e., a reversible plug that can be plugged into a receptacle even when the front and back (top and bottom) are reversed. In addition, the number of core wires can be reduced, which allows the core wires to be thicker, which has advantages in the selection of resin layer materials and manufacturing, as described below. In order to enjoy the convenience of the unification of connectors compliant with the USB Type-C standard, the shape and structure of the mating part of the connector should at least be consistent with the shape and structure of the mating part of the USB Type-C standard of the device to be connected. The shape and structure of the connector board and cable other than the mating part of the connector need not conform to the USB Type-C standard. In other words, the terminals of the communication cable 1 are electrically connected to the pins 112b in the plug 112A or the plug 112B. While the plug 112A, 112B includes a mating part 112a and the pins 112b having a shape and configuration compliant with USB Type-C standard, the number of pins 112b in the plug 112A, 112B that are electrically connected to the communication cable 1 is less than the number of pins compliant with the USB type-C standard. Namely, the number of terminals of the communication cable 1 that are electrically connected to the pins 112b is less than the number of pins in the plug compliant with the USB type-C standard. In addition, since the cable length can be increased without degrading communication quality and the cable can be made lighter, it can be used for in-vehicle equipment, for example.
The first connector 110A is connected to, e.g., a receptacle in a computer and has a resin housing 111A, a plug 112A exposed from the housing 111A, and a connector board 200 located in the housing 111A. The connector board 200A of the first connector 110A electrically connects the plug 112A to one terminal of the communication cable 1.
The second connector 110B is connected to, e.g., a receptacle provided in a peripheral device and uses the same connector as the first connector 110A, as shown in
As shown in
Of the signal wires 2a to 2d that constitute the first differential pair wires 2A and 2B, the two adjacent signal wires 2a and 2b constitute a first differential pair, and the other two adjacent signal wires 2c and 2d constitute a second differential pair. The pair of signal wires 2a and 2b are twisted together with the drain wire 10 and covered collectively by the shield layer 11, thus constituting the first Twinax cable. The other pair of signal wires 2a and 2b are also twisted together with the drain wire 10 and covered collectively by the shield layer 11, thus constituting the second Twinax Cable. The communication cable 1 using a Twinax cable for the first differential pair wires 2A and 2B is hereinafter also referred to as a Twinax type communication cable. A non-twisted type of Twinax cable may also be used as a Twinax cable. The drain wire 10 is, for example, a stranded wire made by twisting together a plurality of metal strands. The signal wires 2a to 2d are examples of signal wires constituting the first differential pair wire.
Each of the signal wires 2a to 2d has a conductor 21 and an insulation layer 22 that covers the conductor 21. The conductor 21 is, for example, a stranded wire consisting of a plurality of metal strands twisted together. The insulation layer 22 is formed from a resin material (e.g., cross-linked polyethylene). The conductor 21 is an example of a center conductor.
The shield layer 11 is provided with an inner shield layer 11a, which is provided inside and formed by wrapping electrically conductive tape (e.g., tape laminated with aluminum and polyester), and an outer shield layer 11b, which is provided outside the inner shield layer 11a and formed by wrapping resin tape (e.g., polyester tape).
A second differential pair wire 3 consists of two signal wires 3a and 3b twisted together. Each of the signal wires 3a and 3b has a conductor 31 and an insulation layer 32 that covers the conductor 31. The conductor 31 is, for example, a stranded wire made by twisting together a plurality of metal strands. The insulation layer 32 is formed from a resin material (e.g., cross-linked polyethylene).
The power wire 4 has a conductor 41 and an insulation layer 42 that covers the conductor 41. The conductor 41 is, for example, a stranded wire consisting of a plurality of metal strands twisted together. The insulation layer 42 is formed from a resin material (e.g., cross-linked polyethylene).
The ground wire 5 has a conductor 51 and an insulation layer 52 that covers the conductor 51. The conductor 51 is, for example, a stranded wire consisting of a plurality of metal strands twisted together. The insulation layer 52 is formed from a resin material (e.g., cross-linked polyethylene). The ground wire 5 may be a bare wire without an insulation layer on its periphery.
The CC wire 6 has a conductor 61 and an insulation layer 52 that covers the conductor 61. The conductor 61 is, for example, a stranded wire consisting of a plurality of metal strands twisted together. The insulation layer 62 is formed from a resin material (e.g., polyvinyl chloride).
The first differential pair wires 2A, 2B, the second differential pair wire 3, the power wire 4, the ground wire 5, and the CC wire 6 are covered by the shield layer 12 together with the filler string 13, and the outside of the shield layer 12 is covered by a sheath 7. The sheath 7 is formed from a resin material (e.g., polyvinyl chloride) with a thickness of about 0.6 to 0.9 mm. The filler string 13 is formed from a fibrous material (e.g., cotton, silk, etc.). The filler string 13 is an example of a filler material.
The shield layer 12 is provided with an inner shield layer 12a, which is provided inside and formed by wrapping electrically conductive tape (e.g., tape laminated with aluminum and polyester), and an outer shield layer 12b, which is provided outside the inner shield layer 12a and formed from metal braid (e.g., tin-plated soft copper wire braid).
(Connector Board Configuration Corresponding to Cables Compliant with USB Type-C Standard)
As shown in
As shown in
As shown in
The terminals 231a to 231i of the cable-side front surface terminal group 231 are formed with a pitch of 0.9 to 1.0 mm, and the terminals 232a to 232i of the cable-side back surface terminal group 232 are formed with a pitch of 0.9 to 1.0 mm. In other words, the minimum pitch of the terminals in the width direction C of the connector board 200B is 0.9 mm.
A connector board 200A is compliant with the USB Type-C standard, but as shown in
As shown in
As shown in
The terminals 231a to 231e, excluding the shield terminal 231f, of the cable-side front surface terminal group 231 are formed with a pitch of 1.0 to 1.57 mm, and the terminals 232a to 232e, excluding the shield terminal 232f, of the cable-side back surface terminal group 232 are formed with a pitch of 1.2 to 2.0 mm. In other words, the minimum pitch of the terminals in the width direction C of the connector board 200A is 1.2 mm.
According to this connector board 200A, the minimum pitch of terminals in the width direction C can be increased to 1.3 times or more than the minimum pitch in the width direction C of the connector board 200B, compliant with the USB Type-C standard. In addition, since the number of cable cores has been reduced, the number of pads on the connector board 200A can also be reduced, and the pad width can be increased from 0.5 mm to 0.8 mm, for example, for the same dimensions and area as the connector board 200B compliant with the USB Type-C standard. The above configuration enables connection work to be performed with the naked eye. In addition, the work of connecting the communication cable 1 to the connector board 200A can be performed without using a jig (alignment component) that aligns and holds the terminals in the communication cable 1 to be connected.
Next, an example of the manufacturing method of a communication cable assembly 100 will be described.
First, two first differential pair wires 2A, 2B, a second differential pair wire 3, a power wire 4, a ground wire 5, a CC wire 6, and a filler 13 are prepared. For the first differential pair wires 2A and 2B, two signal wires 2a, 2b or signal wires 2c, 2d and a drain wire 10, respectively, are twisted together while conductive tape is wrapped around the outer circumference to form an inner shield layer 11a and resin tape is wrapped around the outer circumference of the inner shield layer 11a to form an outer shield layer 11b. The second differential pair wire 3 is formed by twisting two signal wires 3a and 3b together.
Next, the two prepared first differential pair wires 2A, 2B, the second differential pair wire 3, the power wire 4, the ground wire 5, the CC wire 6, and the filler 13 are twisted together and conductive tape is wrapped around the outer circumference of these wires to form the inner shield layer 12a, and metal braid is wrapped around the outer circumference of the inner shield layer 12a to form the outer shield layer 12b. Next, a sheath 7 is formed around the outer circumference of the shield layer 12 by extrusion using an extruder.
The communication cable 1 is manufactured in the manner described above. The communication cable 1 is then cut to the required length, and the terminals are connected to the connector board 100A of the first connector 110A and the connector board 100A of the second connector 110B, thereby producing a communication cable assembly 100 including the communication cable 1, and the first connector 110A and the second connector 110B at both ends of the communication cable 1. The work of connecting the first differential pair wires 2A and 2B to the connector board 100A is described below.
When connecting the conductors 21 of the signal wires 2a and 2b of the communication cable 1 of the first embodiment to the terminals 231a and 231b of the cable-side front surface terminal group 231 of the connector board 200B corresponding to the cable compliant with the USB Type-C standard shown in
According to the first embodiment of the communication cable assembly 100, the following effects are achieved.
(a) The number of cores can be reduced compared to the core wire configuration of cables compliant with the USB Type-C standard, which reduces manufacturing costs and lightens the weight.
(b) When the cable outer diameters are the same, the outer diameter of the core wire can be increased, which enables various characteristics (communication performance, bending resistance (refers to the characteristics of resistance to wire breakage when the cable is repeatedly bent. The same applies hereafter), and mechanical strength). In addition, the thicker conductor reduces the risk of wire breakage due to injection pressure during molding, thereby expanding the options for molding methods. Further, when the cable outer diameters are the same, the core wires such as signal wires 2a and 2b can be made thicker, which expands the range of selection of materials for the insulation layer, for example, from expensive nylon resins such as polyamide to inexpensive polyolefin resins such as polyethylene. It is also possible to shorten the molding time by changing the molding machine from a dedicated low-pressure molding machine to a general-purpose molding machine that performs injection molding.
(c) Since the communication distance of high-speed differential signals relative to the cable diameter can be increased when the cable diameter is reduced (e.g., 3.7 mm), the communication cable can be made lighter without reducing the communication distance. When the cable diameter is the same as before (e.g., 6.8 mm), the communication distance can be increased because the conductors 21 of the first differential pair wires 2A and 2B can be made thicker.
(d) The CC wire 6 allows the use of a reversible plug that can be plugged in even when the front and back (top and bottom) are reversed with respect to the receptacle.
(e) The pitch of terminals 231a and 231b and the pitch of terminals 232a and 232b of connector board 200A are wide, which makes it easy to connect the signal wires 2a to 2d, which constitute the first differential pair wires 2A and 2B, to the connector board 200A.
According to the second embodiment, by selecting the outer diameters of the power wire 4, ground wire 5, and CC wire 6 as appropriate, the cable outer diameter can be made smaller than in the first embodiment without shortening the communication distance for high-speed differential signals.
Similarly to the first embodiment, the communication cable 1 of the third embodiment is a 10-core cable including two first differential pair wires 2A and 2B, a second differential pair wire 3, a power wire 4, a ground wire 5, and a CC wire 6 compliant with the USB Type-C standard, as well as a Vconn wire 8. The communication cable 1 is not limited to a 10-core cable but may have 11 or more cores. The Vconn wire 8 may not conform to the USB Type-C standard.
The Vconn wire 8 has a conductor 81 and an insulation layer 82 that covers the conductor 81. The conductor 81 is, for example, a stranded wire consisting of a plurality of metal strands twisted together. The insulation layer 82 is formed from a resin material (e.g., polyvinyl chloride).
In the first embodiment, the CC wire 6 is placed between the power wire 4 and the ground wire 5, but in the present embodiment, the CC wire 6 is placed alongside the power wire 4 and the ground wire 5, with the CC wire 6 on one side of them and the Vconn wire 8 on the other side. The CC wire 6 and the Vconn wire 8 are connected to the plug's built-in IC chip (eMarker). The communication cable assembly 100 of the third embodiment is manufactured in the same way as the first embodiment, so its description is omitted.
According to the third embodiment, the same effect as the first embodiment is achieved, and since the CC wire 6 and the Vconn wire 8 are provided, the charger and the device can be connected with the communication cable 1 to enable high-speed charging of the device with a power corresponding to the USB PD (Power Delivery) standard.
In the communication cable 1 of the fourth embodiment, a first differential pair wire 2A is composed of a first differential pair wire of coaxial wires 9a and 9b, a first differential pair wire 2B is composed of a second differential pair wire of coaxial wires 9c and 9d, these coaxial wires 9a to 9d are arranged on the outer circumference, and a CC wire 6 and a filler string 14 are arranged in the center, the first differential pair wires 2A, 2B, a second differential pair wire 3, a power wire 4 and a ground wire 5 are covered by a shield layer 12 together with a filler string 13, and the outside of the shield layer 12 is covered by a sheath 7. The filler string 14 is formed from a resin material (e.g., polyethylene). The coaxial wires 9a to 9d are examples of signal wires constituting the first differential pair wire. The filler string 14 is an example of a filler.
Each of the coaxial wires 9a to 9d has a center conductor 91, an inner insulation layer 92 covering the center conductor 91, an outer conductor 93 formed outside the inner insulation layer 92, and an outer insulation layer 94 covering the outer conductor 93. The center conductor 91 is, for example, a stranded wire formed by twisting together a plurality of metal strands. The inner insulation layer 92 is formed from a resin material (e.g., cross-linked polyethylene). The outer conductor 93 is formed from, for example, a metal braid. The outer insulation layer 94 is formed from a resin material (e.g., polyvinyl chloride). The center conductor 91 is an example of a center conductor.
Next, an example of a manufacturing method for the communication cable assembly 100 of the fourth embodiment will be described.
First, two first differential pair wires 2A, 2B, a second differential pair wire 3, a power wire 4, a ground wire 5, a CC wire 6, and fillers 13 and 14 are prepared. For the first differential pair wires 2A and 2B, four coaxial wires 9a to 9d constituting them are prepared. The second differential pair wire 3 is formed by twisting two signal wires 3a and 3b together.
Next, the two prepared first differential pair wires 2A, 2B, the second differential pair wire 3, the power wire 4, the ground wire 5, the CC wire 6, and the fillers 13, 14 are twisted together, and conductive tape is wrapped around the outer circumference of these wires to form an inner shield layer 12a, and metal braid is wrapped around the outer circumference of the inner shield layer 12a to form an outer shield layer 12b. Next, a sheath 7 is formed around the outer circumference of the shield layer 12 by extrusion molding using an extruder.
The communication cable 1 is manufactured in the manner described above. The communication cable 1 is then cut to the required length and the terminals are connected to the connector board 100A of the first connector 110A and the connector board 100A of the second connector 110B, so that a communication cable assembly 100 is produced. The work of connecting the coaxial wires 9a to 9d, which constitute the first differential pair wires 2A and 2B, to the connector board 100A is described below.
When connecting the center conductors 91 of the coaxial wires 9a and 9b of the communication cable 1 of the fourth embodiment to the terminals 231a and 231b of the cable-side front surface terminal group 231 of the connector board 200B corresponding to the cable compliant with the USB Type-C standard shown in
According to the communication cable 1 of the fourth embodiment, the same effects as the first embodiment are achieved, and since the coaxial wires 9a to 9d are used as signal wires constituting the first differential pair wires 2A and 2B, the outer conductors 93 exposed by peeling off the outer insulation layer 94 of the coaxial wires 9a to 9d can be connected to the shield terminals 231f and 232f, making it easy to connect the coaxial wires 9a to 9d to the connector board 200A.
In addition, since the coaxial wires (coaxial cables) 9a to 9d are used as the first differential pair wire 2A, 2B, the coaxial wires 9a to 9d are independent from each other, so that the characteristic change in differential is very small, compared to the Twinax type communication cable, bending resistance can be improved. This is evident from the results of the following durability tests. Namely, an 8-core Coaxial type communication cable without the CC wire 6 was attached to a cable bear (registered trademark), and a durability test was conducted to perform moving bending of the cable under specified conditions repeatedly (moving distance: 1 m, bending speed: 30 times/minute, bending radius (inside): 75 mm). The results of the durability test showed that the required characteristics were maintained even after 30,000,000 cycles of bending by movement, although there was some damage to the sheath and some effects on transmission characteristics. On the other hand, in the Twinax-type communication cable with the same 8-core core wire configuration, when the moving bending exceeds 100,000 times, mechanical damage causes changes in transmission characteristics in the first differential pair wires 2A and 2B, resulting in communication degradation.
According to the communication cable 1 of the fifth embodiment, the same effects as the fourth embodiment are achieved, and since it is equipped with the CC wire 6 and the Vconn wire 8, it is possible to connect a charger and a device with the communication cable 1 and charge the device at high speed with a power corresponding to the USB PD (Power Delivery) standard. In addition, since the coaxial wires 9a to 9d are employed as the first differential pair wires 2A and 2B, bending resistance can be improved.
The communication performance (communication range and attenuation characteristics) of Example 1 corresponding to the first embodiment, Example 2 corresponding to the second embodiment, and a comparative example were tested and evaluated as described below.
A personal computer (PC) as a computer and a camera as a peripheral device were connected by the communication cable under test. The PC was a ProBook 430 G5 available from HP Inc., and the camera was a USB 3.1 Gen1 uEye SE series available from IDS Imaging Development Systems GmbH. The communication cables under test were the following examples: Example 1, Example 2, and Comparative Example. Their configurations are shown in Table 1. In Table 1, T indicates tin-plated soft copper wire and AG indicates silver-plated soft copper wire. In the comparative example, only wires that can be compared with Examples 1 and 2 are shown in Table 1.
In Example 1, a 9-core cable with a cable diameter of 6.8 mm was used. A conductor with AWG size 27 (conductor diameter of 0.42 mm) was used as the conductors 21 of the signal wires 2a to 2d, which constitute the first differential pair wire 2A and 2B. A ratio of the conductor diameter d relative to the cable diameter D (d/D) was 0.062.
In Example 2, a 9-core cable with a cable diameter of 3.7 mm was used. A conductor with AWG size 32 (conductor diameter of 0.24 mm) was used as the conductors 21 of the signal wires 2a to 2d constituting the first differential pair wires 2A and 2B. A ratio of the conductor diameter d relative to the cable diameter D (d/D) was 0.065.
In the comparative example, a 17-core cable with a cable diameter of 5.2 mm was used, and a conductor with AWG size 34 (conductor diameter 0.3 mm) was used as the conductors of the signal wires constituting the first differential pair wire. A ratio of the conductor diameter d relative to the cable diameter D (d/D) was 0.058. If the ratio (d/D) exceeds 0.07, the weight of the communication cable increases.
The images captured by the camera were transmitted to the PC via the communication cable under test, and the communication performance (communication distance) was evaluated based on whether the images were frozen, dropped, noisy, or discolored during the 10 minutes of imaging. 10 minutes with no image problems was designated as “Good” (∘), while no images were captured on the PC was designated as “No good” (x). The evaluation results are shown in Table 2.
The attenuation when the length of the communication cable was 3 m was attributed to the AWG size of the communication cable, and as shown in
As shown in
(1) Example 1 (cable diameter of 6.8 mm) doubled the communication distance from 3 m to 6 m compared to the comparative example (cable diameter of 5.2 mm). Example 2 (cable diameter of 3.7 mm) had the same communication performance as the comparative example (cable diameter of 5.2 mm), and the weight of the communication cable could be reduced.
(2) When the cable diameter was D and the communication distance was L, the evaluated values of communication performance were expressed by a ratio of communication distance L to cable diameter D (L/D). L/D=6000 mm/6.8 mm=882 for Example 1, L/D=3500 mm/3.7 mm=946 for Example 2, and L/D=3000 mm/5.2 mm=577 for the comparative example. Therefore, it can be said that the communication distance relative to the cable diameter L/D is preferably 800 or more, or 880 or more, and more preferably 900 or more, or 940 or more.
In the 9-core communication cable 1 that employs a Twinax cable for the first differential pair wire 2A, 2B, the power wire (core wire No. 7) and the ground wire (core wire No. 8) are arranged on both sides of the CC wire (core wire No. 9), as shown in
In the 10-core communication cable 1 that employs a twinax cable for the first differential pair wires 2A and 2B, the CC wire (core wire No. 9) and the Vconn wire (core wire No. 10) are arranged on both sides of the power wire (core wire No. 7) and the ground wire (core wire No. 8) as shown in
In the 9-core communication cable 1 employing the coaxial wires 9a to 9d for the first differential pair wires 2A and 2B, the paired coaxial wires are adjacent to each other as shown in
In the 10-core communication cable 1 employing the coaxial wires 9a to 9d for the first differential pair wires 2A and 2B, the paired coaxial wires are adjacent to each other as shown in
The above description is not limited to the above embodiments, but can be varied and implemented in various ways.
According to the first feature, a communication cable 1 includes two first differential pair wires 2A, 2B for transmitting high-speed differential signals; a second differential pair wire 3 for transmitting low-speed differential signals; a power wire 4; a ground wire 5; and a configuration channel wire 6 for detecting front and back orientation of a plug 112A, 112B, wherein the communication cable 1 is devoid of other first differential pair wires than the two first differential pair wires 2A, 2B.
According to the second feature, in the communication cable 1, as described by the first feature, includes terminals configured to be electrically connected to the plug 112A, 112B, and the plug 112A, 112B comprises a mating part 112a and pins 112b with a shape and configuration compliant with USB Type-C standard, and the number of terminals of the communication cable 1 that are electrically connected to the pins 112b is less than the number of the pins in the plug compliant with the USB type-C standard.
According to the third feature, the communication cable, as described by the first feature, further includes a power wire for a circuit in the plug.
According to the fourth feature, in the communication cable, as described by the first feature, each of signal wires 2a to 2d constituting the first differential pair wires 2A, 2B has a conductor 21 at a center and an insulation layer 22 covering the conductor 21, and wherein a ratio of a conductor diameter of the conductor 21 to a cable diameter is 0.06 or more.
According to the fifth feature, in the communication cable, as described by the first feature, each of signal wires 2a to 2d constituting the first differential pair wires 2A, 2B has a conductor 21 at a center and an insulation layer 22 covering the conductor 21, and the ratio of a conductor diameter of the conductor 21 to a cable diameter is 0.06 or more and 0.07 or less.
According to the sixth feature, in the communication cable, as described by the third feature, the ratio of a communication distance of the high-speed differential signals to the cable diameter is 800 or more.
According to the seventh feature, in the communication cable, as described by the first feature, the number of core wires is 9 or more and 14 or less.
According to the eighth feature, the communication cable, as described by the first feature, further includes a filler 13 arranged in the vicinity of a cable center.
According to the ninth feature, a communication cable assembly 100 includes the communication cable 1 as described by any one of the first to eighth features, and a pair of plugs 112A, 112B electrically connected to both terminals of the communication cable 1.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2023-142524 | Sep 2023 | JP | national |
