JPH06196891A - Soft hood for shielding electromagnetic wave - Google Patents

Abstract

PURPOSE:To improve performance of shielding electromagnetic waves by designing a soft hood mounted at the cable through opening of an electronic apparatus casing to shield electromagnetic waves which passes there so that its opening can be narrowed down without folding. CONSTITUTION:A conductive soft hood 10 has one end fixed on the casing of an electronic apparatus and the other end narrowed down by a conductive expandable clamp 16. Further, the other end is equipped with a conductive slide fastener 18. Opening the slide fastener 18 makes a wide opening of the clamp 16, thereby easing passage of a cable bundle 22. Closing the slide fastener 18 makes the clamp 16 enlarged in accordance with the diameter of the cable bundle 22 and contacting its outer periphery without being folded in a creaselike manner. This develops no gaps which leak electromagnetic waves and enables full shielding of electromagnetic waves which pass through the cable through opening.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave blocking soft hood which is attached to a connection cable insertion port of a housing containing electronic equipment and blocks electromagnetic waves passing through the cable insertion port.

[0002]

2. Description of the Related Art Conventionally, for example, actual Kaihei 2-54292.
As shown in Japanese Patent Publication, a flexible sheet having conductivity is formed into a tubular shape, and one end thereof is attached to a cable insertion port of a case having conductivity, and a connection cable is inserted therein, and There is known an electromagnetic wave blocking soft hood that narrows the opening at the other end to close the gap between the cable insertion ports. According to this, as shown in FIG. 6 (A), the soft hood 100 has the electronic device 1 arranged in the housing 102.
The cable 101 connected to 04 is passed. And
The gap 106 is closed by narrowing the end portion 100a. As a result, it was possible to block the electromagnetic waves leaking or entering from the cable insertion port.

[0003]

By the way, the electromagnetic wave blocking soft hood is formed in a tubular shape having a sufficiently large diameter so that it can be accommodated even if the thickness and the number of the cables to be passed are changed. Therefore, as shown in FIG. 6B, when the opening 107a of the soft hood 107 is narrowed down with the cable bundle 108 as an axis, the narrowed portion is folded in a fold shape. As a result, there is a problem that a gap 110 is formed in the folded portion and the electromagnetic wave shielding performance is deteriorated. Therefore, an object of the present invention is to improve the electromagnetic wave shielding performance by making it possible to narrow down the opening of an electromagnetic wave shielding soft hood without folding it.

[0004]

Means and Actions for Solving the Problems In order to achieve the above-mentioned object, the present invention has a constitution as described in claim 1 as a means for solving the problems. That is, a flexible sheet-like member having an electromagnetic wave blocking property is formed in a tubular shape, and one end thereof is fixed to a peripheral edge of a cable insertion port provided in a conductive housing, and the other end is in the tube from the cable insertion port. An electromagnetic wave blocking soft hood that blocks the electromagnetic wave passing through the cable insertion port by narrowing the cable bundle that is passed through the cable to close the cable bundle, and a part or all of the other end of the soft hood can be expanded and contracted with electromagnetic wave blocking property. The soft hood for electromagnetic wave shielding is characterized in that it is formed of a member and the other end is narrowed down by expansion and contraction of the elastic member.

According to the electromagnetic wave shielding soft hood having the above-mentioned structure, the elastic member expands and contracts according to the diameter of the cable bundle, so that the other end is folded into a pleated shape to form a gap. There is nothing that can be done, and the elastic member itself does not transmit electromagnetic waves.

Further, the above-mentioned soft hood for blocking electromagnetic waves may be added with the structure described in claim 2. That is, the structure of an electromagnetic wave shielding soft hood is characterized in that a slide fastener having an electromagnetic wave shielding property is provided on the other end side of the elastic member and the end portion of the cylinder is broken when the slide fastener is opened.

According to the electromagnetic wave shielding soft hood having the above-mentioned structure according to the second aspect of the present invention, the end portion can be broken by the slide fastener like the hem of the exercise pants. Therefore, when the slide fastener is opened, the cable bundle is easily passed through the other end. When the slide fastener is closed, the expansion / contraction member expands / contracts according to the diameter of the cable bundle, so that the other end does not fold into a crease and there is no gap.
Both the slide fasteners do not transmit electromagnetic waves.

Further, the problem can be solved also by the structure described in claim 3. That is, a flexible sheet-like member having an electromagnetic wave blocking property is formed in a tubular shape, and one end thereof is fixed to a peripheral edge of a cable insertion port provided in a conductive housing, and the other end is in the tube from the cable insertion port. In a soft hood for blocking electromagnetic waves that blocks a cable bundle that is passed through the shaft by closing it around a shaft and blocks electromagnetic waves that pass through the cable insertion port, a part or all of the other end is formed by a heat-shrinkable member having an electromagnetic wave blocking property. This is a configuration of an electromagnetic wave shielding soft hood, which is formed and contracts the other end by contraction of the heat-shrinkable member.

According to the electromagnetic wave shielding soft hood having the above-mentioned structure according to the present invention, since the heat-shrinkable member shrinks according to the diameter of the cable bundle, the other end is folded into a pleated shape to form a gap. Moreover, the heat-shrinkable member itself does not transmit electromagnetic waves. In addition, the opening that has once contracted due to external force is not loosened.

[0010]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a perspective view showing a state in which an electromagnetic wave blocking soft hood as a first embodiment of the present invention is attached to a cable insertion port provided in a housing for housing an electronic device.

The soft hood 10 has a main body 12 formed of a conductive cloth in a tubular shape, a metal fixing frame 14 provided at one end of the main body 12, and a tightening portion for narrowing the other end of the main body 12. 16 and a slide fastener 18 provided at the other end of the main body 12.

The tightening portion 16 is, for example, an actual opening 61-.
As shown in Japanese Patent Laid-Open No. 202476, an end portion of the main body 12 is formed in advance by a stretchable cloth having an electromagnetic wave shielding property. The slide fastener 18 is, for example, a slide fastener having an electromagnetic wave blocking property as disclosed in Japanese Utility Model Publication No. 1-28719.

Next, a method of using the soft hood 10 will be described. The soft hood 10 described above includes a fixed frame 14
By fixing the panel 20 with a screw, the main body 12 and the panel 20 of the conductive case are electrically connected, and the panel 20
It is attached so as to communicate with the cable insertion port opened in the. Then, the cable bundle 22 introduced from the cable insertion port is passed through the attached soft hood 10.

When passing the cable bundle 22, as shown in FIG. 2, the slide fastener 18 can be opened to widen the opening of the tightening portion 16. This facilitates the work of passing the cable bundle 22. In particular, it is convenient when a large connector bundles the cables provided at the ends. Then, when the slide fastener 18 is closed, the state shown in FIG. 1 is obtained. At this time, the tightening portion 16
Is extended according to the diameter of the cable bundle 22 and is in close contact with the outer periphery of the cable bundle 22 without being folded in a fold shape.

According to the soft hood 10 thus constructed, the tightening portion 16 is not folded in a pleated shape,
There is no gap for electromagnetic waves to leak. Further, since the main body 12, the tightening portion 16, and the slide fastener 18 each have an electromagnetic wave shielding property, it is possible to completely block electromagnetic waves passing through the cable insertion port.

Next, a second embodiment will be described. Figure 3
The soft hood 40 shown in 1 is made of a heat-shrinkable conductive sheet 41 as described in the specification of Japanese Patent Application No. 4-277413 filed by the applicant of the present application.

The heat-shrinkable conductive sheet 41 is, for example,
As shown in FIG. 4, the conductive yarn 43 shown in black, the heat shrinkable yarn 45 shown by dot hatching, and the two knitting yarns 47 shown in white are knitted together. The conductive thread 43 is obtained by plating the surface of the aramid fiber with copper and then plating nickel on the surface of the aramid fiber to prevent oxidation. The conductive yarn 43 is a spun yarn and has a thickness of # 40 single yarn. The non-conductive heat-shrinkable yarn 45 is a spun yarn of copolymerized nylon 66, which is a # 40 twin yarn, and has a heat shrinkage rate of 25%. The knitting yarn 47 is a normal nylon 66 spun yarn and is a 40th twin yarn.

The conductive yarn 43, the heat-shrinkable yarn 45, and the knitting yarn 47 having such a structure are the punch-roam knitting shown in FIG. 4, and the conductive yarn 43 and the knitting yarn 47 are formed on the back surface of one sheet. The heat-shrinkable yarn 45 and the knitting yarn 47 were knitted so as to appear on the surface. That is, the conductive thread 43 in FIG.
Is knitted with the knitting yarn 47 on the back side. The heat shrinkable yarn 45 is knitted with the knitting yarn 47 on the front surface side. Therefore, the heat shrinkable yarn 45 and the knitting yarn 47 are on the front surface of the heat shrinkable conductive sheet 41, and the back surface is
The conductive yarn 43 and the knitting yarn 47 appear.

The heat-shrinkable conductive sheet 41 having such a structure
When is heated, the heat-shrinkable yarn 45 is heat-shrinked, and the loop-shaped stitches are shrunk. Then, the heat-shrinkable yarn 45 is pulled, and the loop-shaped stitches of the conductive yarn 43 and the knitting yarn 47 on the back surface side are also deformed. Thus, the contraction of the heat-shrinkable yarn 45 causes the conductive yarn 43 and the knitting yarn 47 on the back surface side to be deformed. However, these only deform the loop-shaped stitches and cause wrinkles due to the deformation. There is no.

In the second embodiment, the soft hood 40
Is divided into two forks to form tubes 40a and 40b. Before heat treatment, like the cylinder 40b on the right side of the figure,
With a shape that has an opening through which cables can be easily passed, a cable bundle 49 that enters from the lower cable insertion port,
The cable bundles 49a and 49b can be subdivided and passed. Then, after passing the cable bundles 49a and 49b, when the cylinders 40a and 40b are heated by hot air, the cylinders 40a and 40b contract without causing wrinkles and adhere to the cable bundles 49a and 49b, like the cylinder 40a on the left side in the drawing, The openings of the cylinders 40a and 40b can be closed without any gap.

According to the soft hood 40 constructed as described above, since the end portion of the soft hood 40 is heat-shrinked without wrinkling, there is no gap for electromagnetic waves to leak, and the body of the soft hood 40 itself has an electromagnetic wave shielding property. Therefore, electromagnetic waves passing through the cable insertion port can be completely blocked. Moreover, once the heat shrinks, the contracted portion does not loosen even if an external force is applied, so that the electromagnetic wave shielding performance does not deteriorate.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modes can be adopted without departing from the scope of the present invention. For example, the first
In the embodiment, the stretchable conductive cloth is used to form a tube at the end of the main body 12, but FIG.
In Fig. 5 (B), the body of the soft hood itself is entirely made of stretchable cloth, or as shown in Fig. 5 (B). Even if there is a stretchable portion in the middle instead of the end portion as indicated by the diagonal lines in 5 (C), the same effect can be obtained.

Further, in the first embodiment, the slide fastener 18 is provided as a more preferable embodiment, but the slide fastener may be omitted.

[0024]

As described above, according to the electromagnetic shielding soft hood of the present invention, regardless of the diameter of the cable bundle, it closely adheres to the circumference of the cable bundle, so that the electromagnetic shielding soft hood has a higher electromagnetic wave shielding effect than the conventional electromagnetic shielding soft hood. The blocking effect is improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an electromagnetic wave shielding soft hood of a first embodiment.

FIG. 2 is a perspective view showing an electromagnetic wave blocking soft hood of the first embodiment as well.

FIG. 3 is a front view showing an electromagnetic wave shielding soft hood of a second embodiment.

FIG. 4 is a partially enlarged view showing the structure of the heat-shrinkable conductive sheet.

FIG. 5 is a schematic front view showing an electromagnetic wave shielding soft hood as a modified example.

FIG. 6 is an explanatory diagram showing a problem of a conventional electromagnetic wave blocking soft hood. .

[Explanation of symbols]

10, 40 ... Soft hood, 12 ... Main body, 14
... Fixed frame, 16 ... Tightening part, 18 ... Slide fastener, 20 ... Panel, 22, 49 ... Cable bundle, 41 ... Heat-shrinkable conductive sheet, 43 ... Conductive yarn, 45 ... Heat shrinkable yarn, 47 ... Knitting yarn.

Claims (3)

[Claims] 1. A flexible sheet-like member having an electromagnetic wave shielding property is formed into a tubular shape, and one end of the member is fixed to a peripheral edge of a cable insertion port provided in a conductive case, and the other end is the cable insertion port. An electromagnetic wave blocking soft hood that blocks the electromagnetic wave that passes through the cable insertion port by narrowing the cable bundle that is passed through the inside of the tube by the shaft to close it, and expand or contract the electromagnetic wave blocking property at a part or all of the other end. A soft hood for blocking electromagnetic waves, which is formed of a freely elastic member and narrows the other end by expansion and contraction of the elastic member. 2. The electromagnetic wave shielding soft hood according to claim 1, wherein a slide fastener having an electromagnetic wave shielding property is provided on the other end of the expandable and contractible end, and when the slide fastener is opened, an end portion of the cylinder is cracked. A soft hood for blocking electromagnetic waves. 3. A flexible sheet-like member having an electromagnetic wave blocking property is formed in a tubular shape, and one end of the member is fixed to a peripheral edge of a cable insertion port provided in a conductive case, and the other end is the cable insertion port. In a soft hood for electromagnetic wave shielding that blocks the electromagnetic wave passing through the cable insertion port by squeezing the cable bundle that is passed through the inside of the cylinder to the axis to close the bundle, a part or all of the other end is heat having an electromagnetic wave shielding property. A soft hood for blocking electromagnetic waves, which is formed by a contracting member, and the other end is narrowed by contraction of the heat contracting member.