JP5419434B2 - Shielded wire and shielded terminal shield structure - Google Patents

Description

  The present invention relates to a shielded wire using a hollow cylindrical shield foil as a shield conductor, and a shield structure of a terminal portion of the shielded wire when the shielded wire is connected to a connector.

  When connecting a shielded wire with a structure in which the outer side of the inner covered wire is surrounded by a cylindrical shield foil and the outer side of the shield foil is covered with an insulating outer coating to the connector, The shield foil is removed to an appropriate length to expose the inner covered electric wire, and the exposed end portion of the conductor is connected to the connector.

  At that time, if the shield foil is removed and the exposed part of the inner covered wire cannot receive shield protection from the shield shell (shield member) on the connector side, the shield foil can be extended as it is. Since the shield shell on the connector side, which is larger than the foil, cannot be covered, another shield conductor is put on the shield-free portion between the shield foil and the shield shell on the connector side to shield the exposed covered wire portion. I am doing so.

  FIG. 6 shows a shield structure described in Patent Document 1 as an example in that case. In the figure, 101 is a shielded electric wire, 102 is an internal covered electric wire, 103 is a shield foil exposed by removing the external covering of the terminal portion of the shielded electric wire 101, 110 is a connector, 108 is between the shield foil 103 and the connector 110. The conductive sheet is covered, and the conductive sheet 108 covers the exposed portion of the covered electric wire 102.

JP 2003-198178 A

  By the way, when shielding the end portion of the shielded electric wire in this way, it is necessary to use the conductive sheet 108 prepared separately from the shielded electric wire 101 and the connector 110, so that the number of parts and assembly man-hours increase accordingly, and the production efficiency Decreases and the cost increases.

  The present invention has been made in view of the above-described circumstances, and its purpose is to eliminate the conductive sheet, thereby reducing the number of parts and the number of assembly steps, thereby improving production efficiency and reducing costs. An object of the present invention is to provide a shielded electric wire and a terminal shield structure for the shielded electric wire.

In order to achieve the above-described object, the shielded electric wire according to the present invention is characterized by the following (1 ) .
(1) A shielded electric wire in which the outer side of the inner covered electric wire is surrounded by a hollow cylindrical shielding foil, and the outer side of the shielding foil is covered with an insulating outer covering,
Wherein at least a portion located in the terminal portion of the shielded electric wire of the shield foil, a large number of cuts that allow diameter to permit the circumferential direction of stretching of the moiety is formed Rutotomoni,
The shield foil provided with the cuts is provided so as to overlap at least two layers so that the positions of the cuts are shifted .

According to the shielded electric wire having the above configuration (1), at least the terminal portion of the shield foil is provided with a large number of notches that allow the shield foil to be stretched in the circumferential direction so that the diameter can be increased. The diameter can be freely expanded according to the dimensions of the member. Therefore, even without using a conductive sheet prepared separately as in the past, leave the shield foil of the terminal part of the shielded electric wire itself without removing it, expand that part, and extend it to the shield member on the connector side By connecting, the covered electric wire exposed at the terminal portion of the shielded electric wire can be shielded. Thus, since it is not necessary to use a conductive sheet, the number of parts and the number of assembly steps can be reduced, and the production efficiency can be improved and the cost can be reduced.
Further , according to the shielded electric wire having the configuration of ( 1 ), the shield foil provided with the cut is provided so as to overlap two or more layers so that the position of the cut is shifted, so that the shield foil expands when the diameter of the shield foil is increased. The cut portion can be closed with a shield foil of another layer, and high shielding performance can be exhibited.

In order to achieve the above-described object, the terminal shield structure for a shielded wire according to the present invention is characterized by the following ( 2) .
( 2 ) A shielded wire terminal shield structure in which the outer side of the inner covered electric wire is surrounded by a hollow cylindrical shield foil, and the outer side of the shield foil is covered with an insulating outer covering,
A number of notches that allow the diameter of the shield foil to be expanded at a portion positioned at least at the terminal portion of the shielded electric wire, allowing the circumferential extension of the portion, are formed.
Removing the outer coating of the terminal portion of the shielded wire,
By extending the diameter of the shield foil exposed by folding in the circumferential direction in a state of being overlapped double, and connecting the covered electric wire inside the expanded diameter portion of the shield foil to the connector, And the said covered electric wire was covered with the said shield foil by extending the end part of the part expanded in the state which overlap | superposed the said double to the shield member of the electric wire derivation | leading-out part of the said connector.

According to the terminal shield structure of the shielded electric wire having the above configuration ( 2 ), the shield foil exposed by removing the outer coating is expanded, the inner coated electric wire is connected to the connector, and the end of the expanded shield foil By extending the connection to the shield member on the connector side, the coated electric wire exposed at the end of the shielded electric wire can be shielded without using a conductive sheet prepared separately as in the prior art. Therefore, the number of parts and the number of assembly steps can be reduced, and the production efficiency can be improved and the cost can be reduced.
Moreover, according to the terminal shield structure of the shielded electric wire having the configuration of ( 2 ), the diameter of the shield foil is doubled and overlapped, so that the notch portion that expands when the shield foil is expanded is overlapped. It can be closed with another shielding foil, and high shielding performance can be exhibited.

  According to the present invention, the diameter of the shield foil provided in the shielded electric wire itself can be increased to shield the connection portion with the connector, so that it is not necessary to use a separate conductive sheet as in the prior art. The number of parts and assembly man-hours can be reduced, and the production efficiency can be improved and the cost can be reduced.

  The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading through the best mode for carrying out the invention described below with reference to the accompanying drawings.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.

  1A and 1B are diagrams showing a configuration of a connection portion between a terminal portion and a connector of a shielded electric wire according to an embodiment, in which FIG. 1A is an external perspective view, and FIG. 1B is a plan view in which a part of the shield foil is cut away. FIG. 2A and 2B are views showing only the shield foil taken out, FIG. 2A is a view showing a state before the diameter expansion, and FIG. 2B is a view showing a state in which the dimensions are enlarged in accordance with the shield shell on the connector side. FIG.

  FIG. 3A is a schematic diagram showing the initial stage of manufacturing the shield structure, and FIG. 3B is a schematic diagram showing the final stage of manufacturing the shield structure. 4A is a sectional view for explaining the structure of the shielded electric wire, FIG. 4B is a sectional view for explaining a first modified example of the structure of the shielded electric wire, and FIG. 4C is a second modified example of the structure of the shielded electric wire. It is sectional drawing for demonstrating.

  The shielded electric wire 1 of this embodiment is such that the outside of a plurality of covered electric wires 2 inside is surrounded by a hollow cylindrical shield foil 3, and the outer side of the shield foil 3 is covered with an insulating outer covering 6, The shield foil 3 is characterized in that a large number of cuts 4 are provided in at least a portion of the shielded electric wire 1 that is positioned at a terminal portion of the shield foil 3 to allow the portion to be stretched in the circumferential direction. The covered electric wire 2 is obtained by covering the outer peripheral surface of the conductor 7 (see FIG. 4A) with an insulating coating. The shield foil 3 is a conductive metal foil such as a copper foil or an aluminum foil.

  As shown in FIG. 2A, the notches 4 have an appropriate length in the longitudinal direction perpendicular to the circumferential direction of the shield foil 3, and are arranged in the circumferential direction at a constant pitch, for example. Further, the incisions 4 adjacent in the longitudinal direction (obliquely) are arranged in a zigzag shape with a shift of approximately a half pitch in the circumferential direction, and are slightly wrapped in the longitudinal direction. Since the notches 4 adjacent to each other in the longitudinal direction are arranged so as to be slightly overlapped in the longitudinal direction in this way, any of the notches 4 is positioned on a line drawn in the circumferential direction at an arbitrary position in the longitudinal direction. As a result, the shield foil 3 can be stretched in the circumferential direction.

  And, since the shield foil 3 can be stretched in the circumferential direction by making a large number of cuts 4 by means of a press or the like in the shield foil 3 as described above, the dimensions can be enlarged as shown in FIG. 2B. As a result, the member on the connector 10 side can be covered. Note that the multiple cuts 4 may be manually formed in the shield foil 3 using a blade or the like.

  The shield structure of the portion where the terminal portion of the shielded electric wire 1 is connected to the connector 10 is configured as follows.

  That is, first, the outer covering 6 at the terminal portion of the shielded electric wire 1 is removed (see FIG. 3A), and the exposed portion of the shield foil 3 is stretched in the circumferential direction to be expanded in diameter. At the same time, the conductor 7 (see FIG. 4A) of the covered electric wire 2 inside the enlarged diameter portion of the shield foil 3 is crimped, pressure-welded, or soldered to a conductive metal connector terminal (not shown) of the connector 10. Then, the end portion of the shield foil 3 whose diameter has been expanded is extended to the cylindrical fitting portion 16 of the conductive metal shield shell (shield member) 15 that covers the wire lead-out portion 11 of the connector 10. (See FIG. 3B). By carrying out like this, the inside covered electric wire 2 can be covered with the shield foil 3, and it can shield. Electrical connection can be ensured by connecting the cylindrical fitting part 16 and the shield foil 3 using solder, silver paste, or the like. Alternatively, a conductive adhesive material or the like may be used.

  Therefore, by using this shielded electric wire 1, the shield foil 3 at the terminal portion of the shielded electric wire 1 itself is left without being removed without using a conductive sheet separately prepared as in the prior art, and the portion is expanded in diameter. Then, by extending and connecting to the shield shell 15 on the connector 10 side, the covered electric wire 2 exposed at the terminal portion of the shielded electric wire 1 can be shielded, and the number of parts and assembly man-hours can be reduced. It is possible to improve production efficiency and reduce costs.

  In addition, as shown in FIG. 4B, in the above-described embodiment, an elastic material film 31 attached to the outer peripheral surface of the hollow cylindrical shield foil 3 may be used. For example, by providing a stretchable material film 31 made of rubber, other elastically deformable material, etc., the end portion of the shield foil 3 that has been expanded and deformed by the notch 4 is given an elastic restoring force. With this elastic restoring force, the shield foil 3 can be more firmly connected to the cylindrical fitting portion 16 of the shield shell (shield member) 15. In addition, by using the stretchable material film 31 as an insulator, electrical contact with an external conductor can be prevented when exposed from the external coating.

  In addition, when the notch 4 is enlarged, the shielding performance of the notch 4 may be reduced. In order to prevent this, the shield foil 3 exposed by removing the outer coating 6 is folded and expanded in a double overlapped state, and the shield foil 3 expanded in the double overlapped state is expanded. The end is connected to the shield shell 15 of the wire lead-out portion 11 of the connector 10 (see FIG. 4C).

  If it does so, since the part of the notch 4 which expands when the shield foil 3 is diameter-expanded can be plugged up with another shield foil 3 which overlapped, high shield performance can be exhibited.

  Further, at the stage of the shielded electric wire 1, at least two layers of the shield foil 3 provided with the cuts 4 can be provided so that the positions of the cuts 4 are shifted from the beginning. In such a case, since the portion of the notch 4 that expands when the diameter of the shield foil 3 is expanded can be closed with the shield foil 3 of another layer, high shielding performance can be exhibited similarly.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

  For example, the shape of the notch 4 can be freely selected from variations as shown in FIGS. 5A to 5F, for example. 5A is an I-type cut 4a, FIG. 5B is a + -type cut 4b, FIG. 5C is an X-type cut 4c, and FIG. 5D is a Y-type cut 4d. (E) shows a * -shaped cut 4e, and FIG. 5 (f) shows a US-shaped cut 4f.

It is an external appearance perspective view which shows the structure of the connection part of the terminal part and connector of a shielded electric wire of embodiment. It is a figure which shows the structure of the connection part of the terminal part of the shielded electric wire of embodiment, and a connector, Comprising: It is a top view which notches and shows a part of shield foil. It is the figure which took out and showed only the shield foil, Comprising: It is a figure which shows the state before diameter expansion. It is the figure which took out and showed only the shield foil, Comprising: It is a figure which shows the state which expanded the dimension according to the shield shell by the side of a connector. It is a schematic diagram which shows the initial stage of preparation of a shield structure. It is a schematic diagram which shows the last step of preparation of a shield structure. It is sectional drawing for demonstrating the structure of a shielded electric wire. It is sectional drawing for demonstrating the 1st modification of the structure of a shield wire. It is sectional drawing for demonstrating the 2nd modification of the structure of a shield wire. (A)-(f) is a figure which shows the variation of the shape of the notch | incision formed in the shield foil. It is a figure which shows the terminal shield structure of the conventional shielded electric wire.

Explanation of symbols

1: shielded electric wire 2: covered electric wire 3: shielded foil 4: notch 6: outer covering 10: connector 11: electric wire outlet 15: shield shell (shield member)

Claims (2)

A shielded electric wire in which the outer side of the inner covered electric wire is surrounded by a hollow cylindrical shielding foil, and the outer side of the shielding foil is covered with an insulating outer coating,
Wherein at least a portion located in the terminal portion of the shielded electric wire of the shield foil, a large number of cuts that allow diameter to permit the circumferential direction of stretching of the moiety is formed Rutotomoni,
A shielded electric wire, characterized in that at least two layers of the shield foil provided with the cut are provided so as to be displaced from each other . A shielded wire terminal shield structure in which the outer side of the inner covered wire is surrounded by a hollow cylindrical shield foil, and the outer side of the shield foil is covered with an insulating outer coating,
A number of notches that allow the diameter of the shield foil to be expanded at a portion positioned at least at the terminal portion of the shielded electric wire, allowing the circumferential extension of the portion, are formed.
Removing the outer coating of the terminal portion of the shielded wire,
By extending the diameter of the shield foil exposed by folding in the circumferential direction in a state of being overlapped double, and connecting the covered electric wire inside the expanded diameter portion of the shield foil to the connector, And by extending and connecting the end portion of the diameter-expanded portion in a state of being overlapped to the shield member of the wire lead-out portion of the connector, the covered wire is covered with the shield foil, Terminal shield structure of shielded wire to be used.

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