Composite cable
A composite cable having an outer diameter of 1.0 mm or less is provided with a cable core including multiple signal lines, a power line with an outer diameter smaller than an outer diameter of the signal line, and a drain wire with an outer diameter smaller than the outer diameter of the power line, and a sheath covering around the cable core. An outermost layer of the signal line is a shield layer, and either one of the power line or the drain wire is arranged in each valley-like space between the multiple signal lines arranged in contact with one another inside the cable core.
1 . A composite cable, with an outer diameter of 1.0 mm or less, comprising:
a cable core comprising multiple signal lines, a power line with an outer diameter smaller than an outer diameter of the signal line, and a drain wire with an outer diameter smaller than the outer diameter of the power line; and
a sheath covering around the cable core,
wherein an outermost layer of the signal line is a shield layer, and
wherein the power line and the drain wire are arranged in a valley-like space between the multiple signal lines arranged in contact with one another inside the cable core.
2 . The composite cable according to claim 1 , wherein there is a gap between the drain wire and a binder tape wrapped around the cable core in such a manner that the drain wire is movable in a radial direction.
3 . The composite cable according to claim 1 , wherein the outer diameter of the drain wire is 0.4 times or less the outer diameter of the signal line.
4 . The composite cable according to claim 1 , wherein the outer diameter of the power line is 0.4 times or more and 0.5 times or less the outer diameter of the signal line.
5 . The composite cable according to claim 1 , wherein each of an inner conductor of the signal line, a conductor of the power line, and the drain wire is configured by twisting elementary wires, each composed of a copper alloy wire having a tensile strength of 800 MPa or more, and wherein the shield layer is a lateral winding shield made by spirally wrapping elementary wires, each composed of a copper alloy wire having a tensile strength of 800 MPa or more.
6 . The composite cable according to claim 1 , wherein a winding direction of the lateral winding shield, a twisting direction of the drain wire, and a twisting direction of the cable core are a same direction.
7 . The composite cable according to claim 1 , wherein the cable core has three signal lines, two power lines, and one drain wire.
8 . The composite cable according to claim 1 , wherein the cable core has the multiple signal lines for signal transmission, multiple power lines for power supply, and the drain wire for grounding.
9 . The composite cable according to claim 1 , wherein the drain wire is a stranded conductor composed of multiple copper alloy wires twisted together.
10 . The composite cable according to claim 9 , wherein the stranded conductor is not covered with an insulator.
11 . The composite cable according to claim 1 , wherein the drain wire is used for grounding.
12 . The composite cable according to claim 1 , wherein the signal lines are arranged at a center of the cable core and stranded together such that the shield layers of the multiple signal lines are in direct contact with one another.
13 . The composite cable according to claim 1 , wherein the sheath is formed of a fluororesin extruded into a tube directly contacting an outer surface of a binder tape wrapped around the cable core, and wherein no additional shield layer is provided between the binder tape and the sheath.
14 . The composite cable according to claim 1 , wherein the signal line comprises an inner conductor covered by an insulator formed of a fluororesin, and the power line comprises a conductor covered by an insulator formed of a fluororesin harder than the fluororesin of the signal line insulator.
15 . The composite cable according to claim 1 , wherein the binder tape is spirally wrapped around the cable core in a wrapping direction that is the same as a twisting direction of the cable core.
16 . The composite cable according to claim 1 , wherein the signal line has a conductor size of 40 American Wire Gauge (AWG), and
wherein the power line has a conductor size of 42 AWG.
17 . The composite cable according to claim 1 , wherein no filler material is arranged in the valley-like spaces between the multiple signal lines.
18 . The composite cable according to claim 1 , further comprising a connected member attached to a terminal of the composite cable,
wherein the connected member and the terminal are covered by a protective cover material.
19 . The composite cable according to claim 1 , wherein the shield layer of the signal line is composed of tin-plated copper alloy wires to reduce wear on adjacent components during repeated bending.
20 . A composite cable, with an outer diameter of 1.0 mm or less, comprising:
a cable core comprising multiple signal lines, a power line with an outer diameter smaller than an outer diameter of the signal line, and a drain wire with an outer diameter smaller than the outer diameter of the power line; and
a sheath covering around the cable core,
wherein an outermost layer of the signal line is a shield layer,
wherein the power line is arranged in a first valley-like space between the multiple signal lines arranged in contact with one another inside the cable core,
wherein the drain wire is arranged in a second valley-like space between the multiple signal lines arranged in contact with one another inside the cable core, and
wherein there is a gap between the drain wire and a binder tape wrapped around the cable core in such a manner that the drain wire is movable in a radial direction.