Multi-core cable and production method therefor

Patent metadata

Field	Value
Publication number	US-10096402-B2
Application number	US-201515531614-A
Country	US
Kind code	B2
Filing date	Nov 25, 2015
Priority date	Nov 28, 2014
Publication date	Oct 9, 2018
Grant date	Oct 9, 2018

Abstract

Provided herein is a multi-core cable through which positions of a plurality of insulated conductors and a plurality of non-insulated conductors in a cross section in a longitudinal direction are changed and a likelihood of transmission performance being reduced is low. A multi-core cable includes n conductor bundles.

First claim

The invention claimed is:

1. A multi-conductor cable comprising:
n conductor bundles,
wherein the n conductor bundles each include at least one insulated conductor and at least one non-insulated conductor,
a frequency of appearance of the same surface in cross sections perpendicular to a longitudinal direction is AF(N) (N=1 to n) per unit length,
at least one AF(N) (N=1 to n) is different from the others,
the ratio between the number of insulated conductors and the number of non-insulated conductors in each of the n conductor bundles is in a range of 2:3 to 4:1,
a non-insulated conductor paired with an insulated conductor is not fixed, and
each of the insulated conductors is paired with a non-insulated conductor of the same conductor bundle and/or a non-insulated conductor in a different conductor bundle.

2. The multi-conductor cable according to claim 1 ,
wherein the ratio between the number of insulated conductors and the number of non-insulated conductors in each of the n conductor bundles is in a range of 1:1 to 4:1.

3. The multi-conductor cable according to claim 1 ,
wherein the ratio between the number of insulated conductors and the number of non-insulated conductors in each of the n conductor bundles is in a range of 2:3 or more and less than 1:1, and
wherein the ratio between an average value of diameters of the insulated conductors and an average value of diameters of the non-insulated conductors in the n conductor bundles is in a range of 1.2:1 or more and 4:1 or less.

4. The multi-conductor cable according to claim 1 ,
wherein, in the cross sections perpendicular to a longitudinal direction, an average value of values obtained by dividing the shortest distance from the center of each of the insulated conductors of the n conductor bundles to the surface of the adjacent non-insulated conductor by a distance from the center of the insulated conductor to the outermost surface of the insulated conductor is in a range of 1 to 1.3.

5. The multi-conductor cable according to claim 1 ,
wherein the frequency of appearance of the same surface in cross sections perpendicular to a longitudinal direction of all of the n conductor bundles is 0.01 turns/m or less.

6. The multi-conductor cable according to claim 1 ,
wherein a combined resistance when the insulated conductors of the n conductor bundles are connected in parallel is higher than a combined resistance when the non-insulated conductors of the n conductor bundles are connected in parallel.

7. A multi-conductor cable comprising:
n conductor bundles,
wherein the n conductor bundles each include at least one insulated conductor and at least one non-insulated conductor,
the at least one insulated conductor and the at least one non-insulated conductor are twisted T(N) (N=1 to n) times per unit length,
the n conductor bundles are twisted T1 times per unit length,
at least one T(N) (N=1 to n) is different from the others,
the ratio between the number of insulated conductors and the number of non-insulated conductors in each of the n conductor bundles is in a range of 2:3 to 4:1, and
a non-insulated conductor paired with an insulated conductor is not fixed, and each of the insulated conductors is paired with a non-insulated conductor of the same conductor bundle and/or a non-insulated conductor of a different conductor bundle.

8. A method of producing a multi-conductor cable comprising:
twisting n conductor bundles each including at least one insulated conductor and at least one non-insulated conductor in which the at least one insulated conductor and the at least one non-insulated conductor are in a longitudinal direction of the conductor bundles T(N) (N=1 to n) times per unit length, and
twisting the twisted n conductor bundles as a collected conductor group in a longitudinal direction of the conductor group T1 times per unit length,
wherein at least one T(N) (N=1 to n) is different from the others,
the ratio between the number of insulated conductors and the number of non-insulated conductors in each of the n conductor bundles is in a range of 2:3 to 4:1, and
a non-insulated conductor paired with an insulated conductor is not fixed, and each of the insulated conductors is paired with a non-insulated conductor of the same conductor bundle and/or a non-insulated conductor of a different conductor bundle.

Assignees

• Junkosha Inc

Inventors

• Tanabe Suguru
• Adachi Tomohiro

Classifications

• H01B7/0208

  Cables with several layers of insulating material · CPC title

• H01B13/0006

  for reducing the size of conductors or cables · CPC title

• H01B13/004

  for manufacturing rigid-tube cables · CPC title

• H01B11/12 Primary

  Arrangements for exhibiting specific transmission characteristics · CPC title

• H01B13/04 Primary

  Mutually positioning pairs or quads to reduce cross-talk · CPC title