Electromagnetic shielding tube, electromagnetic shielding structure

Patent metadata

Field	Value
Publication number	US-10548250-B2
Application number	US-201916378784-A
Country	US
Kind code	B2
Filing date	Apr 9, 2019
Priority date	Mar 27, 2015
Publication date	Jan 28, 2020
Grant date	Jan 28, 2020

Abstract

The outer layer is peeled exactly a predetermined length from the end portion of the electromagnetic shielding tube. That is, the metal layer is exposed exactly a predetermined range at the end portion of the electromagnetic shielding tube. A flexible conductor is connected to the exposed metal layer. A separated portion is provided in the inner layer. The separated portion is formed along the length direction of the electromagnetic shielding tube. Additionally, a depth of the separated portion is the same value as the thickness of the inner layer. As such, the inner surface of the metal layer is exposed at the separated portion. It is preferable that the separated portion be formed at a plurality of locations in the circumferential direction. The inner layer is divided into a plurality of sections in the circumferential direction by the separated portion. The separated portion is a terminal processed portion, which mitigates the effects caused by differences in the physical properties of the inner layer and the metal layer.

First claim

The invention claimed is:

1. An electromagnetic shielding tube through which an electric wire can be inserted, the electromagnetic shielding tube comprising:
an inner layer made of resin;
a metal layer formed on an outer periphery of the inner layer; and
an outer layer made of resin, formed on an outer periphery of the metal layer; wherein:
the metal layer is exposed at an end portion of the electromagnetic shielding tube; and
a cut burr of the metal layer is formed on the inner layer side throughout the entire periphery at an end surface of the electromagnetic shielding tube, and the height of the cut burr is less than the thickness of the inner layer.

2. The electromagnetic shielding tube according to claim 1 , wherein a terminal processed portion configured to mitigate effects caused by differences in physical properties of the inner layer and the metal layer is provided on an exposed portion of the metal layer.

3. The electromagnetic shielding tube according to claim 2 , wherein:
the terminal processed portion is a stress transmission suppressing structure configured to, in at least a portion of the inner layer, suppress radial forces of the inner layer generated due to changes in temperature from being transmitted to the metal layer;
the stress transmission suppressing structure is a separated portion formed in the inner layer; and
in a cross-section perpendicular to a length direction of the electromagnetic shielding tube, the inner layer is divided into a plurality of sections in the circumferential direction by the separated portion.

4. The electromagnetic shielding tube according to claim 2 , wherein:
the terminal processed portion is a stress transmission suppressing structure configured to, in at least a portion of the inner layer, suppress radial forces of the inner layer generated due to changes in temperature from being transmitted to the metal layer;
the stress transmission suppressing structure is a separated portion between the inner layer and the metal layer; and
at an inner surface of at least a portion of the exposed portion of the metal layer, an outer surface of the inner layer and an inner surface of the metal layer are separated from each other.

5. The electromagnetic shielding tube according to claim 2 , wherein the terminal processed portion is an uneven shape formed on an outer surface of at least a portion of the exposed portion of the metal layer.

6. The electromagnetic shielding tube according to claim 5 , wherein raised portions of the uneven shape are positioned higher than an unprocessed surface of the metal layer.

7. The electromagnetic shielding tube according to claim 2 , wherein:
the metal layer is exposed in an annular shape at the end portion vicinity of the electromagnetic shielding tube; and
the terminal processed portion is a retaining portion configured to prevent a conductor, which is provided on an outer peripheral surface of the metal layer on a tip side of the exposed portion of the metal layer and is connected to the metal layer, from falling off.

8. The electromagnetic shielding tube according to claim 7 , wherein the retaining portion is a portion of the outer layer.

9. The electromagnetic shielding tube according to claim 7 , wherein the retaining portion is a tube fixed on the tip side of the exposed portion of the metal layer.

10. The electromagnetic shielding tube according to claim 7 , wherein the retaining portion is resin disposed on the tip side of the exposed portion of the metal layer.

11. An electromagnetic shielding structure, comprising:
an electromagnetic shielding tube through which an electric wire can be inserted;
a flexible conductor attached to the electromagnetic shielding tube; and
a ring member holding the flexible conductor; wherein:
the electromagnetic shielding tube comprises:
an inner layer made of resin;
a metal layer formed on an outer periphery of the inner layer; and
an outer layer made of resin, formed on an outer periphery of the metal layer;

the metal layer is exposed at an end portion of the electromagnetic shielding tube;
a cut burr of the metal layer is formed on the inner layer side throughout the entire periphery at an end surface of the electromagnetic shielding tube, and the height of the cut burr is less than the thickness of the inner layer;
the flexible conductor is arranged on the exposed portion of the metal layer; and
the flexible conductor is secured to the electromagnetic shielding tube from an outer periphery of the flexible conductor by the ring member.

12. The electromagnetic shielding tube according to claim 11 , wherein a terminal processed portion configured to mitigate effects caused by differences in physical properties of the inner layer and the metal layer is provided on an exposed portion of the metal layer.

13. The electromagnetic shielding structure according to claim 12 , wherein:
the terminal processed portion is a stress transmission suppressing structure configured to, in at least a portion of the inner layer, suppress radial forces of the inner layer generated due to changes in temperature from being transmitted to the metal layer;
the stress transmission suppressing structure is a separated portion formed in the inner layer; and
in a cross-section perpendicular to a length direction of the electromagnetic shielding tube, the inner layer is divided into a plurality of sections in the circumferential direction by the separated portion.

14. The electromagnetic shielding structure according to claim 12 , wherein:
the terminal processed portion is a stress transmission suppressing structure configured to, in at least a portion of the inner layer, suppress radial forces of the inner layer generated due to changes in temperature from being transmitted to the metal layer;
the stress transmission suppressing structure is a separated portion between the inner layer and the metal layer; and
at an inner surface of at least a portion of the exposed portion of the metal layer, an outer surface of the inner layer and an inner surface of the metal layer are separated from each other.

15. The electromagnetic shielding structure according to claim 12 , wherein:
the terminal processed portion is an uneven shape formed on an outer surface of at least a portion of the exposed portion of the metal layer; and
the flexible conductor is arranged on an outer peripheral surface of the uneven shape.

16. The electromagnetic shielding structure according to claim 15 , wherein raised portions of the uneven shape are positioned higher than an unprocessed surface of the metal layer.

17. The electromagnetic shielding structure according to claim 12 , wherein:
the metal layer is exposed in an annular shape at the end portion vicinity of the electromagnetic shielding tube; and
the terminal processed portion is a retaining portion configured to prevent a conductor, which is provided on an outer peripheral surface of the metal layer on a tip side of the exposed portion of the metal layer and is connected to the metal layer, from falling off.

18. The electromagnetic shielding structure according to claim 17 , wherein the retaining portion is a portion of the outer layer.

19. The electromagnetic shielding structure according to claim 17 , wherein the retaining portion is a tube fixed on the tip side of the exposed portion of the metal layer.

20. The electromagnetic shielding structure according to claim 17 , wherein the retaining portion is resin disposed on the tip side of the exposed portio

Assignees

• Furukawa Electric Co Ltd
• Furukawa Automotive Systems Inc

Inventors

• Yamasaki Masanori
• Yuasa Tatsuya
• Sakai Katsutoshi
• Nagao Akihiro

Classifications

• H01R11/12

  End pieces terminating in an eye, hook, or fork · CPC title

• H01R4/60

  Connections between or with tubular conductors (H01R4/56 takes precedence) · CPC title

• H01R4/28

  Clamped connections, spring connections (made by means of terminals specially adapted for contact with, or insertion into, printed circuits H01R12/00) · CPC title

• H02G15/068

  connected to the cable shield only (H02G15/072 takes precedence) · CPC title

• H05K9/0045

  being rigid plastic containers having a coating of shielding material · CPC title