JP2021129342A - Electric wire protector - Google Patents

Abstract

To provide an electric wire protector with excellent electromagnetic wave shielding.SOLUTION: An electric wire protector 1 comprises an insulation sheet 10, a conductive sheet 20 and an opening/closing part 30. The opening/closing part 30 includes: a first coupling piece 31 arranged along one end part of an outer surface side of the insulation sheet 10; and a second coupling piece 32 which is installed along the other end of an inner surface side of the insulation sheet 10 and is attachable/detachable to/from the first coupling piece 31. A loop part 21 is formed on the inner surface side of one end part of the insulation sheet 10, and a folded portion of the loop part 21 is bonded to the inner surface side of the insulation sheet 10 so that it overlaps a region of the first coupling piece 31, and a core member 40 is disposed on an inner side of the loop part 21. One end part and the other end part of the insulation sheet 10 are rounded to overlap each other, and the loop part 21 of the conductive sheet 20 and the other end part are brought into contact with each other to form a shield space of an electric wave inside by coupling one end part and the other end part with the opening/closing part 30.SELECTED DRAWING: Figure 1

Description

The present invention relates to an electric wire protector.

Conventionally, an electric wire protector that covers a single or a plurality of electric wires to protect the surface of the electric wire from damage, dirt, dust, etc. has been used. In addition to the above, this electric wire protector has a function of suppressing the intrusion of electromagnetic waves from the outside and suppressing the leakage of electromagnetic waves from the contained electric wire (see, for example, Patent Applications 1 and 2). ..

JP-A-2017-121113 Japanese Unexamined Patent Publication No. 11-121969

In the above-mentioned electric wire protector, it is required not only to protect the surface of the electric wire but also to improve the shielding property against leakage and intrusion of electromagnetic waves.

An object of the present invention is to provide an electric wire protector having excellent electromagnetic wave shielding properties.

One aspect of the present disclosure includes an insulating sheet, a conductive sheet laminated on the inner surface side of the insulating sheet, and an opening / closing portion for opening and closing two opposite sides of the insulating sheet so as to be openable and closable. The opening / closing portion is provided along a first connecting piece provided along one end on the outer surface side of the insulating sheet and the other end on the inner surface side of the insulating sheet, and the first connecting portion is provided. A loop portion is formed on the inner surface side of the one end portion of the insulating sheet, which has a second connecting piece that can be attached to and detached from the piece, and the conductive sheet is folded back in a substantially U shape. The folded portion of the conductive sheet forming the loop portion is joined to the inner surface side of the insulating sheet so as to overlap the region of the first connecting piece, and the inside of the loop portion is attached to the one end portion. The core material is arranged along the line, and the one end portion and the other end portion of the insulating sheet are rolled so as to overlap each other, and the one end portion and the other end portion are connected by the opening / closing portion. This is an electric wire protector in which the loop portion and the other end portion of the conductive sheet come into contact with each other to form a shield space for radio waves inside.

According to the present disclosure, it is possible to provide an electric wire protector having excellent electromagnetic wave shielding properties.

It is a perspective view when the electric wire protector 1 is seen from the side of the insulating sheet 10. It is a perspective view when the electric wire protector 1 is seen from the side of the conductive sheet 20. It is a side view when the electric wire protector 1 shown in FIG. 2 is seen from the Y1 direction. (A) to (C) are diagrams for explaining the procedure of covering the electric wire with the electric wire protector 1. FIG. 4 is a cross-sectional view taken along the line II of FIG. 4 (C). It is a figure which shows the covering state when both ends of an electric wire 2 are connected to another member.

Hereinafter, embodiments of the electric wire protector according to the present invention will be described. The drawings attached to the present specification are all schematic drawings, and the shape, scale, aspect ratio, etc. of each part are changed or exaggerated from the actual product in consideration of ease of understanding. In particular, the thickness of the wire protector is exaggerated more than it actually is in order to make the configuration easy to understand. Further, in the drawings, hatching indicating a cross section of the member is appropriately omitted.
In the present specification and the like, when the electric wire protector 1 is viewed in a plan view, the lateral direction is the X (X1-X2) direction, the longitudinal direction is the Y (Y1-Y2) direction, and the thickness direction is the Z (Z1-Z2) direction. It is explained as. Further, in the present specification and the like, the "-direction" is also appropriately referred to as the "-side".

1 and 2 are perspective views of the electric wire protector 1 of the embodiment developed in a sheet shape. Of these, FIG. 1 is a perspective view of the electric wire protector 1 when viewed from the side of the insulating sheet 10. FIG. 2 is a perspective view of the electric wire protector 1 when viewed from the side of the conductive sheet 20. FIG. 3 is a side view of the electric wire protector 1 shown in FIG. 2 when viewed from the Y1 direction.

As shown in FIG. 1, the electric wire protector 1 includes an insulating sheet 10, a conductive sheet 20, a chuck tape 30, and a core material 40.
The insulating sheet 10 is a sheet that serves as an outer skin in a shape in which the electric wire protector 1 is rolled into a tubular shape (hereinafter, also referred to as a “used shape”). The insulating sheet 10 is formed of a material having excellent heat resistance, flexibility, folding resistance, bending resistance, electrical insulation, and the like. As the insulating sheet 10, for example, a simple substance of polyvinyl chloride, polyethylene, polyimide or polyester, or a composite thereof is used.

A chuck tape (opening / closing portion) 30 is provided on the insulating sheet 10. The chuck tape 30 is a strip-shaped component that connects two opposite sides of the insulating sheet 10 in the X direction (short direction) so as to be openable and closable when the electric wire protector 1 is used. The chuck tape 30 is composed of a first chuck piece 31 and a second chuck piece 32. As shown in FIG. 3, the first chuck piece (first connecting piece) 31 is provided at the end on the X1 side on the outer surface side (Z1 side) of the insulating sheet 10. In FIG. 3, the connecting surface 31a of the first chuck piece 31 faces the Z1 side. The second chuck piece (second connecting piece) 32 is provided at the end on the X2 side on the inner surface side (Z2 side) of the insulating sheet 10. In FIG. 3, the connecting surface 32a of the second chuck piece 32 faces the Z2 side.

The first chuck piece 31 and the second chuck piece 32 are sewn to the insulating sheet 10 by a sewing machine. Therefore, as shown in FIGS. 1 and 2, two rows of stitch portions 33 are formed on the first chuck piece 31 and the second chuck piece 32, respectively, along the Y direction. As the chuck tape 30, for example, in addition to the opening / closing device disclosed in Japanese Patent Application Laid-Open No. 2002-145313, a device having the same function can be used.

The connecting mechanism of the first chuck piece 31 and the second chuck piece 32 has opposite shapes. That is, if the first chuck piece 31 (connecting surface 31a) is a male mechanism, the second chuck piece 32 (connecting surface 32a) is a female mechanism, and if the first chuck piece 31 is a female mechanism, the second chuck The piece 32 is a male mechanism. In FIG. 1 and the like, the male / female mechanism on each connecting surface of the first chuck piece 31 and the second chuck piece 32 is not shown.

The conductive sheet 20 is a sheet that becomes an endothelium when the electric wire protector 1 has a shape to be used. The conductive sheet 20 is laminated on the inner surface side (Z2 side) of the insulating sheet 10. The conductive sheet 20 is made of a material having excellent flexibility, folding resistance, bending resistance, and conductivity. As the conductive sheet 20, for example, a metal foil, a metal plate, a metal mesh, a carbon mesh, nanocarbon, a hybrid fiber, a hybrid mesh, or the like is used. More specifically, copper foil with excellent shielding properties, conductive rubber thin plate, non-woven fabric with nickel and copper plating on polyester, urethane foam with copper and nickel plating, and conductive acrylic coating are used. Be done.

Although not shown, a thin film of a thermoplastic resin layer (hereinafter, also referred to as “heat welding layer”) such as polyethylene (PE) or polypropylene (PP) is formed on one side of the conductive sheet 20. The insulating sheet 10 and the conductive sheet 20 are joined by superimposing the surface of the conductive sheet 20 on which the heat-welded layer is formed on the insulating sheet 10 and melting the heat-welded layer by heat welding. The insulating sheet 10 and the conductive sheet 20 are partially joined by heat welding. In the heat-welded layer, the portion that is not heat-welded becomes an insulating layer on one side of the conductive sheet 20.

As shown in FIG. 2, the end portion 20a on the X2 side of the conductive sheet 20 is provided up to a position where it comes into contact with the side edge portion 32s of the second chuck piece 32. On the other hand, a loop portion 21 is formed at the end of the conductive sheet 20 on the X1 side. The loop portion 21 is a portion in which the end portion of the conductive sheet 20 on the X1 side is folded back in a substantially U shape. By providing the loop portion 21 on the conductive sheet 20, when the electric wire protector 1 is rolled into a tubular shape, the contact area between the end portion on the X1 side and the end portion on the X2 side of the conductive sheet 20 can be increased. can. As a result, the end portion of the conductive sheet 20 on the X1 side and the end portion on the X2 side can be brought into contact with each other in a wider area.

When the end on the X1 side and the end on the X2 side of the conductive sheet 20 come into contact with each other over a wide area, electromagnetic waves emitted in multiple directions from the contained electric wire are emitted from the conductive sheet 20 in a tubular shape. Since it can be rotated along the circumferential direction, the conductive sheet 20 can efficiently absorb the electromagnetic waves emitted from the included electric wires in multiple directions. Further, since the end portion (loop portion 21) on the X1 side of the conductive sheet 20 and the end portion on the X2 side come into contact with each other, an electromagnetic wave shielding space is formed inside the electric wire protector 1, so that the contained electric wire is included. It is possible to suppress the leakage of electromagnetic waves emitted from the outside and the intrusion of electromagnetic waves from the outside.

As shown in FIG. 3, the folded portion (hereinafter, also referred to as “folded portion”) 21a of the loop portion 21 is on the inner surface side (Z2 side) of the insulating sheet 10 so as to overlap the region of the first chuck piece 31. ) Is joined by heat welding. By arranging the folded-back portion 21a of the conductive sheet 20 so as to overlap the region of the first chuck piece 31, electromagnetic waves leak from the needle hole (not shown) formed in the stitch portion 33 of the first chuck piece 31. Can be suppressed.

Further, as shown in FIG. 3, in the loop portion 21, the end 21b of the folded portion 21a is in contact with the conductive sheet 20. As a result, the loop portion 21 has a shape connected in an annular shape. Further, as will be described later, when the electric wire protector 1 is rolled into a tubular shape to form a usable shape, a part of the loop portion 21 comes into contact with the end portion of the conductive sheet 20 on the X2 side. As a result, the conductive sheet 20 has a shape in which the entire conductive sheet 20 is connected in an annular shape.
Although not shown, a ground wire is connected to the conductive sheet 20. The electromagnetic wave absorbed by the conductive sheet 20 is guided to the ground wire as an induced current. The ground wire is connected to the conductive sheet 20 by, for example, soldering.

As shown in FIG. 2, the core material 40 is arranged inside the loop portion 21 along the end portion of the conductive sheet 20 on the X1 side. The core material 40 is used to prevent the inner surface side of the loop portion 21 from sticking to the inner surface side of the insulating sheet 10 and being crushed when the folded portion 21a of the loop portion 21 is heat-welded to the inner surface side of the insulating sheet 10. It is a member. As the core material 40, it is desirable to use a resin having higher heat resistance than the temperature at the time of heat welding (about 100 to 200 ° C.) and having a high restoring force from the compressed state. In addition to the resin, fibers, rubber, or the like having the same heat resistance and restoring force may be used. The cross-sectional shape of the core material 40 is preferably elliptical, circular, or the like in order to prevent damage to the conductive sheet 20 when the electric wire protector 1 having the shape to be used is bent. The thickness of the core material 40 varies depending on the size of the loop portion 21 and the like, but is, for example, about 1.5 to several mm.

The core material 40 is arranged inside the loop portion 21 when the end portion of the conductive sheet 20 on the X1 side is folded back into a substantially U shape to form the loop portion 21. The folded-back portion 21a of the loop portion 21 and the inner surface side of the insulating sheet 10 are heat-welded with the core material 40 arranged inside the loop portion 21. Specifically, the folded portion 21a of the loop portion 21 and the inner surface side of the insulating sheet 10 are overlapped with each other, and the two are joined by heat welding by pressurizing while applying heat by a roller (not shown). ..

When the folded-back portion 21a of the loop portion 21 and the inner surface side of the insulating sheet 10 are superposed and heat-welded, the loop portion 21 is temporarily crushed, but due to the restoring force of the core material 40, the loop portion 21 The cross section can be restored to a nearly original shape (eg, an ellipse). Further, when heat welding is performed, sticking of the loop portion 21 on the inner surface side is also suppressed. As shown in FIG. 3, when the electric wire protector 1 is formed into a used shape by forming the loop portion 21 into a three-dimensionally raised shape, a part of the loop portion 21 and the end of the conductive sheet 20 on the X2 side. The contact area with the part can be increased.

Next, a procedure for covering the electric wire with the electric wire protector 1 of the present embodiment will be described.
4 (A) to 4 (C) are diagrams illustrating a procedure for covering an electric wire with the electric wire protector 1. FIG. 5 is a cross-sectional view taken along the line I-I of FIG. 4 (C). FIG. 6 is a diagram showing a covering state when both ends of the electric wire 2 are connected to other members.
First, as shown in FIG. 4A, the electric wire 2 is arranged on the conductive sheet 20 of the electric wire protector 1 developed in a sheet shape. FIG. 4 shows an example in which a plurality of electric wires 2 are included in the electric wire protector 1, but the electric wire 2 may be a single number. In addition, in FIGS. 4A to 4C, the shape of the electric wire protector 1 is simplified and drawn. Further, the portions of the chuck tape 30 (31, 32) are shown by diagonal lines.

Next, as shown in FIG. 4B, the end of the electric wire protector 1 on the X1 side is folded back to the X2 side and put on the electric wire 2. As a result, the first chuck piece 31 provided at the end of the electric wire protector 1 on the X1 side faces the Z2 side (front side in the drawing). Next, the end of the wire protector 1 on the X2 side is folded back to the X1 side, and the connecting surface 32a of the second chuck piece 32 of the wire protector 1 and the connecting surface 31a of the first chuck piece 31 are overlapped. The connecting surface 32a of the second chuck piece 32 is pressed against the connecting surface 31a of the first chuck piece 31. As a result, as shown in FIG. 4C, the first chuck piece 31 and the second chuck piece 32 can be connected to close the chuck tape 30.

By closing the chuck tape 30, as shown in FIG. 5, the periphery of the plurality of electric wires 2 can be covered with the electric wire protector 1. The chuck tape 30 can be opened by peeling the connecting surface 32a of the second chuck piece 32 from the connecting surface 31a of the first chuck piece 31 in the state where the chuck tape 30 is closed.

Since the electric wire protector 1 of the present embodiment is rolled into a tubular shape from a sheet-like unfolded state, terminals 3 and 4 at both ends of the electric wire 2 are fixed to other members 5 and 6 as shown in FIG. Can be easily installed. Further, since the electric wire protector 1 of the present embodiment has flexibility and flexibility, it can be attached to the electric wire 2 in a shape used according to the bending of the electric wire 2 even when the electric wire 2 is bent.

According to the electric wire protector 1 of the present embodiment, for example, the following effects are obtained.
Since the electric wire protector 1 has a loop portion 21 at the end of the conductive sheet 20, the contact area of both ends of the conductive sheet 20 can be increased when the electric wire protector 1 is rolled into a tubular shape. As a result, both ends of the conductive sheet 20 can be brought into contact with each other in a wider area. By contacting both ends of the conductive sheet 20 over a wide area, electromagnetic waves emitted from the contained electric wires in multiple directions can be rotated along the circumferential direction of the conductive sheet 20 rolled into a tubular shape. Therefore, the conductive sheet 20 can efficiently absorb the electromagnetic waves emitted from the included electric wires in multiple directions.

By the above action, in the electric wire protector 1 rolled into a tubular shape, the conductive sheet 20 can efficiently absorb the electromagnetic waves emitted from the contained electric wires in multiple directions. Further, by rolling the electric wire protector 1 into a tubular shape, the end portion of the conductive sheet 20 on the X1 side and the end portion on the X2 side come into contact with each other, and an electromagnetic wave shielding space is formed inside the electric wire protector 1. NS. Therefore, it is possible to suppress the leakage of the electromagnetic wave emitted from the contained electric wire to the outside and the invasion of the electromagnetic wave from the outside. Further, in the electric wire protector 1, the folded-back portion 21a of the loop portion 21 is joined to the inner surface side of the insulating sheet 10 so as to overlap the region of the first chuck piece 31. Therefore, leakage of electromagnetic waves from the needle hole (not shown) formed in the stitch portion 33 of the first chuck piece 31 can be suppressed. Therefore, the electric wire protector 1 of the present embodiment is excellent in shielding electromagnetic waves.

The electric wire protector 1 includes a chuck tape 30 as an opening / closing portion for opening / closing two sides of the insulating sheet 10 facing each other in the X direction so as to be openable / closable. Since the chuck tape 30 does not generate static electricity, dust, etc. when it is opened and closed, it can be used with confidence even in places where a clean environment is required, such as a clean room, a medical facility, a computer-related facility, and an IC manufacturing facility. Further, since the chuck tape 30 can be opened and closed without a special tool, the workability is also excellent.

In the electric wire protector 1, the insulating sheet 10 and the conductive sheet 20 are joined by heat welding. Therefore, the number of times that the conductive sheet 20 formed of a thin film such as a copper foil can be bent can be extended without breaking the conductive sheet 20.
In the conductive sheet 20 of the electric wire protector 1, the core material 40 is arranged inside the loop portion 21 along the end portion of the conductive sheet 20 on the X1 side. Therefore, when the folded-back portion 21a of the loop portion 21 is heat-welded to the inner surface side of the insulating sheet 10, it is possible to prevent the inner surface side of the loop portion 21 from sticking to the inner surface side and becoming a crushed state.

By using a resin having heat resistance higher than the temperature at the time of heat welding as the core material 40, it is possible to prevent the core material 40 from being melted at the time of heat welding. Further, by using a resin having high heat resistance and a high restoring force from the compressed state as the core material 40, the cross-sectional shape of the loop portion 21 can be returned to a substantially original state after heat welding. Further, the electric wire protector 1 can be easily bent.

Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various modifications and changes can be made as in the modified forms described later, and these are also disclosed in the present disclosure. Included within the technical scope of. In addition, the effects described in the embodiments are merely a list of the most suitable effects resulting from the present disclosure, and are not limited to those described in the embodiments. The above-described embodiment and the modified form described later can be used in combination as appropriate, but detailed description thereof will be omitted.

(Transformed form)
The insulating sheet 10 and the conductive sheet 20 are not limited to heat welding, and may be joined by, for example, double-sided tape or an adhesive.
The first chuck piece 31 and the second chuck piece 32 of the chuck tape 30 are not limited to sewing, and may be attached to the insulating sheet 10 by, for example, a method such as adhesion or heat welding.
A hook-and-loop fastener may be used instead of the chuck tape 30 as the opening / closing portion of the insulating sheet 10. The surface fastener is not limited to sewing, and may be attached to the insulating sheet 10 by, for example, a method such as adhesion or heat welding.

A plurality of core members 40 may be arranged inside the loop portion 21. Further, when the resin layer is thickly coated on the X1 side end (inside) of the conductive sheet 20 and the X1 side end of the conductive sheet 20 is folded back into a substantially U shape, the loop portion 21 A portion in which the resin layers are overlapped in a substantially U shape may be formed inside the surface, and this portion may be used as the core material.

1: Wire protector 10: Insulation sheet 20: Conductive sheet 30: Chuck tape (opening and closing part)
31: First chuck piece (first connecting piece)
32: 2nd chuck piece (2nd connecting piece)
40: Core material

Claims (6)

Insulating sheet and
A conductive sheet laminated on the inner surface side of the insulating sheet and
An opening / closing portion that connects two sides of the insulating sheet facing each other so as to be openable / closable.
With
The opening / closing portion is provided along a first connecting piece provided along one end on the outer surface side of the insulating sheet and the other end on the inner surface side of the insulating sheet, and the first connecting piece is provided. It has a second connecting piece that can be attached and detached with respect to
A loop portion in which the conductive sheet is folded back in a substantially U shape is formed on the inner surface side of the one end portion of the insulating sheet, and the folded portion of the conductive sheet forming the loop portion is formed. It is joined to the inner surface side of the insulating sheet so as to overlap the region of the first connecting piece, and a core material is arranged along the one end portion inside the loop portion.
The loop portion and the loop portion of the conductive sheet are formed by rolling the one end portion and the other end portion of the insulating sheet so as to overlap each other and connecting the one end portion and the other end portion with the opening / closing portion. An electric wire protector that comes into contact with the other end to form a shielded space for radio waves inside. In the electric wire protector according to claim 1,
The opening / closing part is an electric wire protector made of a chuck tape or a hook-and-loop fastener. In the electric wire protector according to claim 1 or 2.
An electric wire protector in which the insulating sheet and the conductive sheet are joined by heat welding. In any one of claims 1 to 3, in the electric wire protector,
The insulating sheet is an electric wire protector formed of a simple substance of polyvinyl chloride, polyethylene, polyimide or polyester or a composite thereof. In any one of claims 1 to 4, in the electric wire protector,
The conductive sheet is an electric wire protector formed of a metal foil, a metal plate, a metal mesh, a carbon mesh, nanocarbon, a hybrid fiber, or a hybrid mesh. In the electric wire protector according to any one of claims 1 to 5,
The core material is an electric wire protector formed of a resin having heat resistance higher than the temperature at which the insulating sheet and the conductive sheet are heat-welded.

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