JP2912130B2 - Electromagnetic shielding structure for cable - Google Patents
Electromagnetic shielding structure for cableInfo
- Publication number
- JP2912130B2 JP2912130B2 JP5203800A JP20380093A JP2912130B2 JP 2912130 B2 JP2912130 B2 JP 2912130B2 JP 5203800 A JP5203800 A JP 5203800A JP 20380093 A JP20380093 A JP 20380093A JP 2912130 B2 JP2912130 B2 JP 2912130B2
- Authority
- JP
- Japan
- Prior art keywords
- cable
- cylindrical
- semi
- shielding structure
- divided
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明はケーブル用電磁遮へい構
造に関し、特に筺体に搭載した電子機器に接続されるケ
ーブルから放射される不要電磁波を抑制するケーブル用
電磁遮へい構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic shielding structure for a cable, and more particularly to an electromagnetic shielding structure for a cable for suppressing unnecessary electromagnetic waves radiated from a cable connected to an electronic device mounted on a housing.
【０００２】[0002]
【従来の技術】従来、電子機器を収容する筺体に配線用
ケーブル導入の為に設けられた開口部の電磁遮へい構造
は、図３に示すように開口部１１の寸法を小さくした
り、フェライトコア１０を取り付けて電磁波の漏洩を抑
制する構造や、図４に示すように、開口部１２に導電布
を利用する導電部ダクト１３を設けてバンド１４で緊締
し電磁波の漏洩を抑制する構造をとっていた。2. Description of the Related Art Conventionally, as shown in FIG. 3, an electromagnetic shielding structure of an opening provided for introducing a wiring cable into a housing for accommodating an electronic device can be realized by reducing the size of the opening 11 or by using a ferrite core. 4, a structure for suppressing the leakage of electromagnetic waves, or a structure for providing a conductive portion duct 13 using a conductive cloth in the opening 12 and tightening the band 14 to suppress the leakage of electromagnetic waves as shown in FIG. I was
【０００３】[0003]
【発明が解決しようとする課題】上述した従来のケーブ
ル用電磁遮へい構造では、図３に示す場合には開口部１
１やフェライトコア１０とケーブル５との間に隙間を生
じる為に電磁遮へい効果が低下することのほか、フェラ
イトコア１０が固定しにくいといった問題点があり、ま
た図４に示すように導電布ダクト１３を電子機器の筺体
９に隙間無く配設することが困難で十分な電磁遮へい効
果が確保できないという問題点があった。In the conventional electromagnetic shielding structure for a cable described above, in the case shown in FIG.
1 and the gap between the ferrite core 10 and the cable 5, the electromagnetic shielding effect is reduced, and the ferrite core 10 is difficult to fix. Further, as shown in FIG. There is a problem that it is difficult to dispose the electronic component 13 in the housing 9 of the electronic device without any gap, and a sufficient electromagnetic shielding effect cannot be secured.
【０００４】本発明の目的は上述した問題点を解決し、
不要電磁波に対する電磁遮へい効果を著しく増大したケ
ーブル用電磁遮へい構造を提供することにある。[0004] It is an object of the present invention to solve the above-mentioned problems,
An object of the present invention is to provide an electromagnetic shielding structure for a cable in which an electromagnetic shielding effect against unnecessary electromagnetic waves is significantly increased.
【０００５】[0005]
【課題を解決するための手段】本発明のケーブル用電磁
遮へい構造は、電子機器を搭載した筺体に配設したケー
ブル貫通用の開口部を貫通するケーブルの放射する不要
電磁波を遮へいするケーブル用電磁波遮へい構造であっ
て、同一外径を有する円筒状の磁性体部材と導電体部材
とを中心軸を一致させて交互に配置しかつそれらの外周
を金属もしくはプラスチックのカバーで被覆して内部に
ケーブルを貫通させて前記開口部を嵌入可能とした構成
を有する。SUMMARY OF THE INVENTION An electromagnetic shielding structure for a cable according to the present invention is a cable electromagnetic shielding device for shielding unnecessary electromagnetic waves radiated from a cable penetrating a cable penetrating opening provided in a housing on which electronic equipment is mounted. A shield structure, in which cylindrical magnetic members and conductive members having the same outer diameter are alternately arranged with their central axes coincident, and their outer peripheries are covered with a metal or plastic cover, and a cable is inserted inside. Through which the opening can be fitted.
【０００６】また本発明のケーブル用電磁遮へい構造
は、前記円筒状の磁性体部材と導電体部材とをそれぞれ
２分割して一対の半円筒状の磁性体部材と導電体部材と
して対向配置した構成を有する。In the electromagnetic shielding structure for a cable according to the present invention, the cylindrical magnetic member and the conductive member are each divided into two parts, and a pair of semi-cylindrical magnetic members and a conductive member are opposed to each other. Having.
【０００７】発明によるケーブル用電磁遮へい構造は、
電子機器を搭載した筐体に配設したケーブル貫通用の開
口部を貫通するケーブルの放射する不要電磁波を遮へい
するケーブル用電磁波遮へい構造であって、一端をフラ
ンジ状とした円筒状の導電体部材を２分割し、前記２分
割された半円筒状の導電体部材の各々の内面に少なくと
も１本の溝を円周方向に、かつ前記溝が前記２分割され
た半円筒状の導電体部材を前記円筒状に合体させたとき
に、その円筒内で対向するように設けたうえ、前記溝に
半円筒状の磁性体部材を埋設し、前記埋設した状態で前
記２分割された半円筒状の導電体部材を前記円筒状に合
体状態にして内部に前記ケーブルを貫通させて前記開口
部へ嵌入可能とさせ、かつ前記フランジ部が前記筐体に
係止・固定するようにした。The electromagnetic shielding structure for a cable according to the present invention comprises:
An electromagnetic wave shielding structure for a cable that shields unnecessary electromagnetic waves radiated from a cable that penetrates a cable penetrating opening provided in a housing on which an electronic device is mounted, and is a cylindrical conductive member having a flange at one end. Is divided into at least one groove in the inner surface of each of the divided semi-cylindrical conductive members in a circumferential direction, and the semi-cylindrical conductive member having the grooves divided into two. When combined into the cylindrical shape, the semi-cylindrical magnetic member is provided so as to face the inside of the cylinder, and a semi-cylindrical magnetic member is embedded in the groove. The conductor member is integrated into the cylindrical shape so that the cable penetrates the inside so that it can be fitted into the opening, and the flange portion is locked and fixed to the housing.
【０００８】[0008]
【作用】電子機器を搭載した筺体に配設したケーブル貫
通用の開口部を貫通するケーブルの放射する不要電磁波
に減衰を与えて抑圧するには、不要電磁波に交互に異る
インピーダンスを与えて反射，屈折を生起させ波動イン
ピーダンスの不整合状態を与えることによって可能とな
る。円筒状もしくはこれを２分割した半円筒状の磁性体
部材と導電体部材を交互にケーブルの周囲に配設するこ
とによって不要電磁波に対する波動インピーダンスの不
整合状態を発生させて不要電磁波を減衰する。円筒状か
半円筒状かの選択は実装条件などを勘案して決定する
が、いずれにせよ簡素な構成で実現しうる。In order to attenuate and suppress unnecessary electromagnetic waves radiated from a cable penetrating a cable penetrating opening provided in a housing on which electronic equipment is mounted, unnecessary electromagnetic waves are reflected by giving alternately different impedances to the unnecessary electromagnetic waves. This can be achieved by causing refraction to give a mismatch state of the wave impedance. By alternately arranging a cylindrical or semi-cylindrical magnetic member and a conductor member divided into two around the cable, a mismatch state of the wave impedance with respect to the unnecessary electromagnetic wave is generated and the unnecessary electromagnetic wave is attenuated. The selection between the cylindrical shape and the semi-cylindrical shape is determined in consideration of mounting conditions and the like.
【０００９】[0009]
【実施例】次に、本発明について図面を参照して説明す
る。図１は本発明の第１の実施例を分解して示す斜視図
である。図１を参照するに、本発明の第１の実施例は、
対向する一対の半円筒状磁性体片１と、半円筒状導電体
片２と、半円筒状磁性体片１および半円筒状導電体片２
をケーブル５に固定するカバー３とを有する。半円筒状
磁性体片１と半円筒状導電体片２とをそれぞれ、ケーブ
ル５の周囲に交互に配置し、それらの外周をカバー３で
蔽い、止め金具４で固定することによりケーブル用電磁
遮へい体を構成する。Next, the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing a first embodiment of the present invention. Referring to FIG. 1, a first embodiment of the present invention comprises:
A pair of opposing semi-cylindrical magnetic pieces 1, semi-cylindrical conductive pieces 2, semi-cylindrical magnetic pieces 1 and semi-cylindrical conductive pieces 2
To the cable 5. The semi-cylindrical magnetic pieces 1 and the semi-cylindrical conductive pieces 2 are alternately arranged around a cable 5, their outer circumferences are covered with a cover 3, and fixed with a stopper 4, so that the cable electromagnetic field is reduced. Construct a shield.
【００１０】半円筒状磁性体片１は、焼結フェライト
材、フェライト粉末を混入した高分子材、磁性アモルフ
ァス合金やパーマロイなどの磁性合金により構成される
が、数１０ＭＨｚ以上の周波数帯において十分な減衰効
果を得るためには高周波帯における透磁率の低下の小さ
い焼結フェライトが適当である。また半円筒状導電体片
２は鉄、アルミなどの金属、導電性高分子樹脂、あるい
は導電塗装、導電被膜を施した高分子樹脂等により構成
される。これら半円筒状磁性体１と半円筒状導電体片２
とは、互いに異るインピーダンスをケーブル５から放射
される不要電磁波に与えて減衰させる。The semi-cylindrical magnetic piece 1 is made of a sintered ferrite material, a polymer material mixed with ferrite powder, or a magnetic alloy such as a magnetic amorphous alloy or a permalloy. In order to obtain an attenuation effect, a sintered ferrite having a small decrease in magnetic permeability in a high frequency band is suitable. The semi-cylindrical conductor piece 2 is made of a metal such as iron or aluminum, a conductive polymer resin, or a conductive resin or a polymer resin coated with a conductive film. These semi-cylindrical magnetic body 1 and semi-cylindrical conductor piece 2
Means that different impedances are given to unnecessary electromagnetic waves radiated from the cable 5 and attenuated.
【００１１】図２は本発明の第２の実施例を分解して示
す斜視図である。半円筒状磁性体片６は半円筒状導電体
７の内周面に円周方向に形成した凹状の溝に挿入してあ
り、また半円筒状導電体７は開口部８に嵌入し固定され
る。FIG. 2 is an exploded perspective view showing a second embodiment of the present invention. The semi-cylindrical magnetic piece 6 is inserted into a concave groove formed in the inner circumferential surface of the semi-cylindrical conductor 7 in the circumferential direction, and the semi-cylindrical conductor 7 is fitted and fixed in the opening 8. You.
【００１２】このようにして、従来の問題を排除した簡
素な構成による高い電磁遮へいを確保することができ
る。In this manner, high electromagnetic shielding can be ensured by a simple configuration eliminating the conventional problems.
【００１３】なお、上述した第１および第２の実施例で
はいずれも、対向する一対の半円筒状電磁遮へい部材と
して形成したが、これらを円筒状の電磁遮へい部材とし
て形成することも容易に実施しうることは明らかであ
る。In each of the first and second embodiments described above, a pair of semi-cylindrical electromagnetic shielding members opposed to each other are formed. However, these can be easily formed as cylindrical electromagnetic shielding members. It is clear that this is possible.
【００１４】[0014]
【発明の効果】以上説明したように本発明は、電子機器
に接続されたケーブルの周囲に対向する一対の半円筒状
磁性体と半円筒状導電性とを交互に配置するかもしくは
半円筒状導電体の内側に半円筒状磁性体片を埋め込んだ
ものを対向配置するという簡素な構成でケーブルの放射
する不要電磁波に帯する電磁遮へい度を著しく増大する
ことができる効果を有する。As described above, according to the present invention, a pair of semi-cylindrical magnetic members and semi-cylindrical conductive members facing each other around a cable connected to an electronic device are alternately arranged or semi-cylindrical. With a simple configuration in which a semi-cylindrical magnetic piece is embedded inside a conductor and opposed to each other, the degree of electromagnetic shielding of unnecessary electromagnetic waves emitted from the cable can be significantly increased.
【図１】本発明の第１の実施例を分解して示す斜視図で
ある。FIG. 1 is an exploded perspective view showing a first embodiment of the present invention.
【図２】本発明の第２の実施例を分解して示す斜視図で
ある。FIG. 2 is an exploded perspective view showing a second embodiment of the present invention.
【図３】従来のケーブル用電磁遮へい構造の第一例を示
す斜視図である。FIG. 3 is a perspective view showing a first example of a conventional electromagnetic shielding structure for a cable.
【図４】従来のケーブル用電磁遮へい構造の第二例を示
す斜視図である。FIG. 4 is a perspective view showing a second example of a conventional electromagnetic shielding structure for a cable.
１ 半円筒状磁性体片 ２ 半円筒状導電体片 ３ カバー ４ 止め金具 ５ ケーブル ６ 半円筒状磁性体片 ７ 半円筒状導電体片 ８ 開口部 ９ 筺体 １０ フェライトコア １１ 開口部 １２ 開口部 １３ 導体布ダクト １４ バンド REFERENCE SIGNS LIST 1 semi-cylindrical magnetic piece 2 semi-cylindrical conductor piece 3 cover 4 stopper 5 cable 6 semi-cylindrical magnetic piece 7 semi-cylindrical conductor piece 8 opening 9 housing 10 ferrite core 11 opening 12 opening 13 Conductive cloth duct 14 band
フロントページの続き (56)参考文献 特開 平３−224299（ＪＰ，Ａ) 実開 平３−43797（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) H05K 9/00 H04B 15/02 H01F 17/06 Continuation of the front page (56) References JP-A-3-224299 (JP, A) JP-A-3-43797 (JP, U) (58) Fields investigated (Int. Cl. 6 , DB name) H05K 9 / 00 H04B 15/02 H01F 17/06
Claims (3)
ブル貫通用の開口部を貫通するケーブルの放射する不要
電磁波を遮へいするケーブル用電磁波遮へい構造であっ
て、同一外径を有する円筒状の磁性体部材と導電体部材
とを中心軸を一致させて交互に配置しかつそれらの外周
を金属もしくはプラスチックのカバーで被覆して内部に
ケーブルを貫通させて前記開口部を嵌入可能としたこと
を特徴とするケーブル用電磁遮へい構造。An electromagnetic wave shielding structure for a cable for shielding unnecessary electromagnetic waves emitted from a cable penetrating a cable penetrating opening provided in a housing on which an electronic device is mounted, wherein the cylindrical electromagnetic wave shielding structure has the same outer diameter. The magnetic member and the conductor member are alternately arranged with their central axes coincident with each other, and the outer periphery thereof is covered with a metal or plastic cover so that a cable can be penetrated inside so that the opening can be fitted. Characteristic electromagnetic shielding structure for cables.
をそれぞれ２分割して一対の半円筒状の磁性体部材と導Are divided into two parts, and each of them is connected to a pair of semi-cylindrical magnetic members.
電体部材として対向配置したことを特徴とする請求項１2. The electric member according to claim 1, wherein said electric member is opposed to said electric member.
記載のケーブル用電磁遮へい構造。Electromagnetic shielding structure for the cable described.
ブル貫通用の開口部を貫通するケーブルの放射する不要
電磁波を遮へいするケーブル用電磁波遮へい構造であっ
て、一端をフランジ状とした円筒状の導電体部材を２分
割し、前記２分割された半円筒状の導電体部材の各々の
内面に少なくとも１本の溝を円周方向に、かつ前記溝が
前記２分割された半円筒状の導電体部材を前記円筒状に
合体させたときに、その円筒内で対向するように設けた
うえ、前記溝に半円筒状の磁性体部材を埋設し、前記埋
設した状態で前記２分割された半円筒状の導電体部材を
前記円筒状に合体状態にして内部に前記ケーブルを貫通
させて前記開口部へ嵌入可能とさせ、かつ前記フランジ
部が前記筐体に係止・固定するようにしたことを特徴と
するケーブル用電磁遮へい構造。3. A cable provided in a housing on which an electronic device is mounted.
No need to radiate cables penetrating through the cable opening
An electromagnetic wave shielding structure for cables that shields electromagnetic waves
Then, a cylindrical conductive member having one end in a flange shape is divided into two parts.
Each of the two divided semi-cylindrical conductive members
At least one groove is formed on the inner surface in the circumferential direction, and
The semi-cylindrical conductive member divided into two parts is formed into the cylindrical shape.
When combined, they were provided to face each other in the cylinder
In addition, a semi-cylindrical magnetic member is embedded in the groove.
In the installed state, the semi-cylindrical conductive member divided into two is
The cable is inserted into the cylindrical shape and penetrated inside.
To fit into the opening, and the flange
Characterized in that the part is locked and fixed to the housing
Electromagnetic shielding structure for the cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5203800A JP2912130B2 (en) | 1993-08-18 | 1993-08-18 | Electromagnetic shielding structure for cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5203800A JP2912130B2 (en) | 1993-08-18 | 1993-08-18 | Electromagnetic shielding structure for cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0758482A JPH0758482A (en) | 1995-03-03 |
| JP2912130B2 true JP2912130B2 (en) | 1999-06-28 |
Family
ID=16479952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5203800A Expired - Lifetime JP2912130B2 (en) | 1993-08-18 | 1993-08-18 | Electromagnetic shielding structure for cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2912130B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11238990A (en) * | 1998-02-19 | 1999-08-31 | Murata Mfg Co Ltd | Radiation noise suppressing device |
| JP3536757B2 (en) * | 1999-12-24 | 2004-06-14 | 日本電気株式会社 | Mounting structure of noise reduction filter |
| JP5297301B2 (en) * | 2009-08-24 | 2013-09-25 | パナソニック株式会社 | Lighting device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03224299A (en) * | 1989-12-04 | 1991-10-03 | Nikko Kogyo Kk | Bushing with noise filter |
| JP3043797U (en) * | 1997-05-27 | 1997-11-28 | 株式会社ドイコーポレーション | Pendulum display for sales promotion |
-
1993
- 1993-08-18 JP JP5203800A patent/JP2912130B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0758482A (en) | 1995-03-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19990309 |