JPH06152177A - Soft hood for electromagnetic wave shielding - Google Patents

Abstract

PURPOSE:To prevent the decrease of electromagnetic waves sielding performance when a cable bundle inserted into a soft hood is distributed to two or more electronic apparatuses, in an electromagnetic waves shielding soft hood which is fixed to a cable insertion port of an electronic apparatus cabinet and shields the electromagnetic waves passing the port. CONSTITUTION:A conductive soft hood 10 is constituted as a trident cylinder, and notches 18 are formed in the apertures of cylinders 10a-10c. A cable bundle 26 inserted from a cable insertion port is divided to small cable bundles 26a-26c, and led out from the cylinders 10a-10c. The apertures of the cylinders 10a-10c are so closed that the cable bundles 26a-26c are applied to shafts, and the notches 18 are overlapped, squeezed and blocked. Thereby the squeezed apertures are not stretched and gaps are not generated, when the cable bundle 26 is divided to three directions and wired. Gaps are not generated also on the aperture periphery. As the result, the electromagnetic waves shielding performance is not deteriorated by distributing the cable bundle.

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 the publication, a flexible conductive sheet is formed into a tubular shape, one end of which is attached to a cable insertion opening provided in a conductive housing, and a connection cable is inserted thereinto,
Further, there is known a soft hood for blocking electromagnetic waves, which closes and closes the opening at the other end. By attaching such an electromagnetic wave blocking soft hood to the cable insertion port,
It was possible to block electromagnetic waves leaking or entering from the cable insertion port.

[0003]

By the way, for example, referring to FIG.
As shown in (A), an electromagnetic wave blocking soft hood 100
Cables 10 exiting from the narrowed opening 100a
Reference numeral 1 denotes an electronic device 1 arranged in the housing 102.
04 is connected. Therefore, a gap 106 may be formed between the cables 101.
In particular, in the case where the two cables 101 are pulled in substantially opposite directions centering on the cable insertion port,
In some cases, the narrowing of the opening 100a is widened to create a large gap.

Therefore, an object of the present invention is to eliminate the opening gap in the electromagnetic wave shielding soft hood for shielding the electromagnetic wave leaking or entering from the cable insertion port, and to further enhance the electromagnetic wave shielding effect.

[0005]

In order to achieve such an object, the present invention has a constitution as set forth in claim 1 as a means for solving the problem. That is, a conductive flexible sheet-like member is formed into a tubular shape, and an opening at one end thereof is fixed to a peripheral edge of a cable insertion opening of a housing in which an electronic device is housed, and a cable bundle is passed through the cable insertion opening into the cylinder. In an electromagnetic wave blocking soft hood that blocks an electromagnetic wave that leaks or enters from the cable insertion port by closing the opening at the other end with a blocking structure that closely adheres to the outer periphery of the cable bundle, the other end branches into two or more branches. Is formed in a tubular shape that extends,
The electromagnetic wave blocking soft hood is characterized in that the cable bundle that enters from the cable insertion port is configured to be subdivided from each of the openings at the other ends of the branches.

According to the electromagnetic wave blocking soft hood of the first aspect of the present invention having the above-mentioned structure, the other end of the tubular shape extending from the cable insertion port into the one end of the tubular shape is branched into two or more branches. It can be put out in small portions from each opening. For this reason, if the cables extending in substantially the same direction are bundled and passed through the respective other ends, the cable bundles coming out from one opening are bundled into a small unit, and no gap is formed between the cables. .

By the way, as shown in FIG. 8B, in the conventional electromagnetic wave shielding soft hood 107, the opening 107a that is closed by narrowing down the cable bundle 108 so that it can be used for a somewhat thick cable bundle 108. It has a large size. Therefore, if the opening 107a is simply squeezed from the outside, the squeezed portion may be folded into a pleated shape, and a gap 110 may be formed here. In particular, at the other end of the electromagnetic wave shielding soft hood of the present invention, the cable bundle 108
Since the diameter of the opening 107a is relatively large with respect to the diameter of the cable bundle 108, the gap 110 is easily formed.

Therefore, as a means for solving this problem, as described in claim 2, as the closing structure,
It is possible to adopt a structure in which one or more cuts are made from the branched other end, and the diameter of the other end opening can be reduced while overlapping the cuts. This prevents the opening at the other end from being folded in a pleated shape, and can prevent a gap from being formed.

Further, as described in claim 3, as the closing structure, a plurality of elastically deformable conductive protrusions are provided on the inner peripheral surface of the other end, and the inside of the other end branched by the protrusions is formed. It is also possible to adopt a structure that blocks the passing electromagnetic waves. According to this, the tip of the protrusion provided on the inner peripheral surface of the other end is elastically deformed while being in contact with the cable bundle, and only the cable bundle is inserted, and a gap through which electromagnetic waves can pass cannot be formed. Moreover, since it is sufficient to simply pass the cable bundle and there is no need to squeeze the other end, the work efficiency is extremely high.

Further, when the closing structure is provided with the structure according to claim 3, as described in claim 4, the engaging member provided in the opening at the other end of the branch and the other end You may add the structure which engages with the engaging member provided in the cable insertion opening of the electronic device case which connects the cable which goes out from an opening.

[0011]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of an electromagnetic wave shielding soft hood attached to a cable insertion port provided in a housing of an electronic device according to a first embodiment of the present invention. The soft hood 10 is made of a conductive soft cloth 12 sewn into a trifurcated tubular shape. A fixed frame 14 is attached to one end of the soft hood 12, and a cable insertion port provided in a panel 16 of the housing. The soft hood 10 is communicated with and is screwed. The other end of the soft hood 10 is divided into three parts, and a cylinder 1
0a, 10b, 10c are formed.

The side surface of the tube 10b is provided with a notch 18 and can be opened as shown in the drawing. A surface fastener piece 20 is provided in the vicinity of the notch 18. Furthermore, cylinder 1
A surface fastener band 22 and a surface fastener piece 24 that engage with the surface fastener piece 20 are provided inside 0b. In addition,
The cylinders 10a and 10c have exactly the same structure as the cylinder 10b.

Next, a method of closing the cable insertion port with the soft hood 10 will be described. The cable bundle 26 is put into the soft hood 10 from below. Cable bundle 2
6 is three cable bundles 26 inside the soft hood 10.
a, 26b, 26c are subdivided into cylinders 10a, 10
It is taken out from each opening of b and 10c. Then, when the open end like the illustrated cylinder 10b is brought into close contact with the cable bundle 26b and the opening is narrowed and wound, the hook-and-loop fastener band 22, the hook-and-loop fastener piece 24, and the hook-and-loop fastener piece 20 are engaged. Then, like the illustrated cylinder 10a and cylinder 10c, the cylinder 10b is fixed in a state of being wrapped around the cable bundle 26b, and the cable insertion port is closed.

According to the soft hood 10 having such a configuration, the cable bundle 26 can be subdivided from the cylinders 10a, 10b, 10c, so that, for example, both the cable bundles 26a, 26c extending in substantially opposite directions can be obtained. Even if a pulling force is applied to, there will be no gap between the cables.
Moreover, since the openings of the cylinders 10a, 10b, 10c can be narrowed down while the cuts 18 are overlapped with each other, they are not folded in a pleated shape and no gap is formed.

Next, a second embodiment will be described. Second
After the embodiment, only characteristic parts different from those of the first embodiment will be described in detail. As shown in FIG. 2, the soft hood 3
The end of 0 is divided into four forks, and the tubes 30a, 30b, 30
c and 30d are formed. Cylinders 30a, 30b, 30
On the opening side of c, 30d, the throttle parts 32a, 32b, 32
c and 32d are provided. Throttle parts 32a to 32d
Is formed in a pre-squeezed state by a stretchable cloth having conductivity, as disclosed in Japanese Utility Model Laid-Open No. 61-202476. When the cables 34a, 34b, 34c, and 34d are passed through here, the diameters of the narrowed portions 32a to 32d are expanded according to the thickness of the passed cables. As a result, the narrowed portions 32a to 32d are in close contact with the cables 34a to 34d and no gap is formed.

Next, a third 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 third embodiment, the soft hood 40
Is divided into two forks to form tubes 40a and 40b. Before the heat treatment, the cable bundle 49 has a shape having an opening through which the cables can be easily inserted like the tube 40b, and the cable bundle 49 entering from the lower cable insertion port is
It can be subdivided into a and 49b. Then, after passing the cable bundles 49a, 49b, the tubes 40a, 40b
When heated with hot air, the tubes 40a and 40b contract without wrinkling and tightly adhere to the cable bundles 49a and 49b, as shown in the tube 40a in the figure, and the tubes 40a and 4b.
It is possible to close the opening of 0b without a gap.

Next, a fourth embodiment will be described. Figure 5
As shown in FIG. 3, the end of the soft hood 50 is divided into two forks to form tubes 50a and 50b. The metal rings 51, 51 are attached to the open ends of the cylinders 50a, 50b. Inside the metal ring 51,
A cylinder 50a provided with a plurality of elastically deformable conductive projections 52, 52, ...
It blocks the end face of 50b. The cable bundle 54 inserted from the lower side of the soft hood 50 includes the cable bundles 54a and 5a.
It can be subdivided into 4b and output from the open ends of the respective cylinders 50a and 50b. At this time, like the cylinder 50b shown in the figure, the protrusions 52, 52, ... Are elastically deformed while closely contacting the outer circumference of the cable bundle 54b, so that the cable bundle 54b can be passed through without forming a gap through which electromagnetic waves pass. You can

Next, a fifth embodiment will be described. As shown in FIG. 6, a fixed frame 62 is attached to the lower end of the soft hood 60, and the soft hood 60 is screwed to the cable insertion port provided in the panel 63a of the housing 63 while communicating with the soft hood 60. The upper end of the soft hood 60 is bifurcated to form tubes 60a and 60b. Each cylinder 60a, 6
The open end of 0b is provided with an engagement thread 64, 64 having a female screw, the female screw portion of which freely rotates and can be screwed. A conductive brush 66 that elastically deforms is planted inside the engagement ring 64 to close the end surfaces of the cylinders 60a and 60b to which the engagement ring 64 is attached. The cable bundle 68 inserted from the lower side of the soft hood 60 is subdivided into cable bundles 68a and 68b,
It can be taken out from the open end of each cylinder 60a, 60b. At this time, the brush 66 is elastically deformed while being in close contact with the outer circumferences of the cable bundles 68a and 68b, so that the cable bundle 68b can be passed through without forming a gap through which electromagnetic waves pass.

By the way, in the fifth embodiment, each cylinder 6
The cable bundles 68a and 68b output from the casings 0a and 60b are drawn into the conductive casings 70 and 70 that house the electronic devices installed in the casing 63. A cable insertion port is opened in the housing 70, and the engagement ring 64 is provided there.
An engaging plug 72 having a male screw that engages with is attached. The engagement ring 64 and the engagement plug 72 are
Made of conductive material such as metal or metal plated resin. As a result, when the engagement ring 64 and the engagement plug 72 are engaged with each other after the cable bundle 68b is passed through as in the illustrated tube 60b, the housing 70 and the soft hood 60 are connected as in the illustrated tube 60a. It is possible to connect while taking continuity. As a result, not only electromagnetic waves from the outside of the housing 63 but also electromagnetic waves leaking from the housing 70 to the inside of the housing 63 can be shielded, and the internal space of the housing 63 can be in a more completely electrically sealed state. it can. Therefore, for example, it is extremely effective when another electronic device 74 mounted in the housing 63 suffers from electromagnetic interference, which is a problem.

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, it goes without saying that the gist of the present invention is a soft hood having a plurality of branched ends, and the number of branches is not limited to that shown in the embodiments.

Further, in the second embodiment, the fixing in the narrowed state is performed by using the surface fastener, but FIG. 7 (A)
As shown in FIG. 7, even if the string 80 is tied up, there is a notch so that the opening is not folded to form a gap. Further, the number of cuts may be two or three or more as in this modification.

Further, the engaging structure provided in the opening of the soft hood shown in the fifth embodiment has the same effect even if it is not a screw structure. For example, as shown in FIG. 7B, an engaging ring 92 having an engaging projection 91 that hooks on the flange portion 90a of the engaging plug 90 may be provided at the end of the soft hood, or as shown in FIG. 7C. As described above, the end portion of the soft hood may be tightened by the hook-and-loop fastener band 94 and connected to the flange portion 90 a of the engagement plug 90. Of course, an ordinary cord may be used instead of the surface fastener band 94.

In addition, the structure in which the diameter of the opening can be narrowed down while overlapping the notched portion of the opening shown in the first embodiment, and the diameter of the cable bundle through which the diameter of the opening shown in the second embodiment passes A structure that expands accordingly, a structure in which the diameter of the opening shown in the third embodiment is contracted by heating and closely adheres to the cable bundle, and a structure in which an electromagnetic wave passing therethrough is blocked by the elastically deformable conductive projection shown in the fourth embodiment And a structure in which the engaging member provided in the opening of the soft hood shown in the fifth embodiment and the engaging member provided in the cable insertion port of the electronic device housing are engaged with each other,
The closing structure itself of the opening shown in each example is not limited to the soft hood of the present invention, and can be applied to a simple tubular soft hood that is not divided into two or more conventional ones, and a good opening can be closed. What you can do is self-evident.

[0028]

As described above, according to the electromagnetic wave shielding soft hood of the present invention, the cable bundle that enters the tubular end from the cable insertion opening is branched from each of the openings at the tubular other end that extends in two or more branches. Since it can be delivered in small portions, if you bundle the cables that extend in substantially the same direction and pass them through different ends, the cable bundles that come out of one opening will be bundled together in a small and cohesive manner. There is no gap in.

Furthermore, according to the electromagnetic shielding soft hood of any one of claims 2 to 4, even when the diameter of the cable bundle is small, the soft hood is closely attached to the periphery of the cable bundle, so that the electromagnetic wave is shielded. The effect can be further enhanced.

[Brief description of drawings]

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

FIG. 2 is a schematic perspective view showing an electromagnetic wave shielding soft hood of a second embodiment.

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

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

FIG. 5 is a schematic perspective view showing an electromagnetic wave shielding soft hood of a fourth embodiment.

FIG. 6 is a schematic perspective view showing a part of the electromagnetic wave shielding soft hood of the fifth embodiment in a cutaway manner.

FIG. 7 is a schematic explanatory view showing a main part of an electromagnetic wave shielding soft hood of a modified example.

FIG. 8 is an explanatory diagram showing a problem of the conventional technique.

[Explanation of symbols]

10, 30, 40, 50, 60 ... Soft food, 1
4, 62 ... Fixed frame, 16, 63a ... Panel, 1
8 ... Notches, 20, 24 ... Face fastener pieces, 2
2, 94 ... Surface fastener band, 26, 49, 54, 68
... Cable bundle, 51 ... Metal ring, 52 ...
Projection, 63, 70 ... Casing, 64, 92 ... Engaging ring, 66 ... Brush, 72, 90 ... Engaging plug, 74 ... Electronic device, 80 ... String, 91 ... Engagement protrusion.

Claims (4)

[Claims] 1. A conductive flexible sheet-shaped member is formed into a tubular shape, and an opening at one end thereof is fixed to a peripheral edge of a cable insertion port of a housing in which an electronic device is housed, and a cable is inserted from the cable insertion port into the tube. An electromagnetic wave blocking soft hood that allows a bundle to pass therethrough and closes the opening at the other end by a closing structure that is in close contact with the outer periphery of the cable bundle, and blocks electromagnetic waves that leak or invade from the cable insertion port. A soft hood for blocking electromagnetic waves, which is formed in a tubular shape that branches into and extends into, and is configured so that a cable bundle that enters from the cable insertion port can be subdivided from each opening at the other end that is branched. 2. The soft hood for electromagnetic wave shielding according to claim 1, wherein the closing structure has one or more cuts from the opening of the branched other end, and the cut ends are overlapped with each other while the cut ends are overlapped. A soft hood for blocking electromagnetic waves, which has a structure capable of narrowing down the diameter of the opening. 3. The electromagnetic wave shielding soft hood according to claim 1, wherein a plurality of elastically deformable conductive protrusions are provided on the inner peripheral surface of the other end as the closing structure, and the other end branched by the protrusions. An electromagnetic wave blocking soft hood, which is provided with a structure for blocking electromagnetic waves that pass through the inside of the. 4. The electromagnetic wave shielding soft hood according to claim 3, further comprising: an engaging member provided at the opening at the other end of the branch, and an electronic device housing for connecting a cable extending from the opening at the other end. An electromagnetic wave blocking soft hood, comprising a structure for engaging with an engaging member provided at a cable insertion port.