JPH1098274A - Portable electronic devices - Google Patents
Portable electronic devicesInfo
- Publication number
- JPH1098274A JPH1098274A JP8274144A JP27414496A JPH1098274A JP H1098274 A JPH1098274 A JP H1098274A JP 8274144 A JP8274144 A JP 8274144A JP 27414496 A JP27414496 A JP 27414496A JP H1098274 A JPH1098274 A JP H1098274A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic material
- composite magnetic
- portable electronic
- electronic device
- conductor layer
- 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.)
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- Casings For Electric Apparatus (AREA)
- Laminated Bodies (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、携帯用の電子機器
の内、映像機器、音響機器、情報システム機器、ゲーム
機器等の特に電波を発信する機能を有しない携帯用電子
機器の筐体の構成方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing for a portable electronic device having no function of transmitting radio waves, such as a video device, an audio device, an information system device, and a game device. Related to the configuration method.
【０００２】[0002]
【従来の技術】従来、これらの携帯用電子機器の筐体
は、ＡＢＳ等に代表される樹脂によって形成される。樹
脂製の前記筐体は、成形性に優れ軽量であるため、一般
に多く用いられている。2. Description of the Related Art Conventionally, the housings of these portable electronic devices are formed of a resin such as ABS. The resin housing is generally widely used because of its excellent moldability and light weight.
【０００３】近年、携帯電話、コンパクトディスク、ゲ
ーム機器等の持ち運び可能な電子機器が急速に普及して
きた。最近では、携帯電話によるものと思われる医療機
器の誤作動が報告されており、病院内での使用規制が実
施されつつある。航空業界においても、機内持ち込みの
電子機器によるものと考えられる電磁波干渉の問題が報
告され、携帯用電子機器の使用に歯止めをかける動きが
でてきている。In recent years, portable electronic devices such as mobile phones, compact discs, and game devices have rapidly become widespread. Recently, a malfunction of a medical device, which is considered to be caused by a mobile phone, has been reported, and usage in hospitals is being regulated. The aviation industry has also reported the problem of electromagnetic interference, which is thought to be caused by electronic devices carried on board, and there has been a movement to halt the use of portable electronic devices.
【０００４】医療機器にしても航空機にしても、誤作動
が人命に関わる重大な影響を及ぼす結果となるため、携
帯電話やトランシーバー、（赤外線式を除く）ワイヤレ
ス式の電子機器のような明らかに電波を発信する機器に
ついては、ある程度、使用制限があってもやむを得ず、
むしろ制限が無く事故が発生してしまう方が問題であ
る。[0004] Malfunctions can have serious and potentially life-threatening consequences for both medical equipment and aircraft, and are clearly apparent in mobile phones, transceivers and wireless (except infrared) electronic equipment. Regarding devices that emit radio waves, even if there are some restrictions on use,
Rather, there is no limit and an accident occurs.
【０００５】ところが、このような明らかに電波を発信
する機能を持たない機器でも、電磁波干渉を引き起こし
ていることが種々の調査で明らかになってきている。例
えば、ＣＤプレーヤーで巡航中の航空機がコースを外れ
たり、ノートパソコンで、警告灯が点滅したりなどの不
具合が発生している。[0005] However, various investigations have revealed that such devices which do not clearly have a function of transmitting radio waves also cause electromagnetic interference. For example, troubles such as an aircraft cruising with a CD player going off the course and a warning light flashing on a notebook computer have occurred.
【０００６】[0006]
【発明が解決しようとする課題】携帯用電子機器の良い
ところは、いつでもどこでも使いたいときに使えるとい
う点である。現在、報告されている以外の場所において
も、使用規制が実施されないとも限らない。これらの場
所で使用規制が実施されてしまえば、携帯用電子機器の
最大のメリットが失われかねない。最良の対策は、携帯
用電子機器を原因とする電磁波干渉を引き起こさせない
ことである。The advantage of a portable electronic device is that it can be used anytime and anywhere. There is no guarantee that usage restrictions will not be enforced in places other than those currently reported. Once usage restrictions are enforced in these locations, the greatest benefits of portable electronic devices may be lost. The best solution is not to cause electromagnetic interference caused by portable electronic devices.
【０００７】携帯用に限らず、電子機器においては、あ
らゆるところからノイズが発生しており、多種多様なＥ
ＭＩ対策が採られているにも関わらず、事前に全ての対
策をすることは非常に困難である。特に、当初予想しな
かった部分からのノイズの発生や発生原因が不明である
ものなど対応が難しい。[0007] Not only in portable devices but also in electronic devices, noise is generated from everywhere, and various types of E are generated.
Even though MI measures are taken, it is very difficult to take all measures in advance. In particular, it is difficult to cope with a situation in which the occurrence of noise from an unexpected portion or the cause of occurrence is unknown.
【０００８】これらの事情から、本発明では、電子機器
からノイズを外に出さない手段を考え、発生したノイズ
を吸収する材料により筐体を構成することに想到した。Under these circumstances, in the present invention, a means for preventing noise from coming out of the electronic device has been considered, and the inventor has conceived of forming the housing with a material that absorbs the generated noise.
【０００９】従来よく採られる方法として、遮蔽が挙げ
られ、通常、電磁波を遮蔽する場合、金属材料によるシ
ールドが行われるが、この方法であると、放射ノイズを
反射して生じるノイズや伝導ノイズがシールドをアンテ
ナとして放射されるノイズなどの、いわゆる２次放射ノ
イズが発生するという問題がある。２次放射ノイズの発
生は、外部に対しては悪影響を及ぼさない場合でも、機
器内部へ悪影響を及ぼす、即ち電子機器自体の誤作動を
招く原因となる。Shielding is a well-known conventional method. Usually, when shielding electromagnetic waves, shielding with a metal material is performed. However, this method causes noise or conduction noise generated by reflecting radiation noise. There is a problem that so-called secondary radiation noise such as noise radiated using the shield as an antenna is generated. The generation of the secondary radiation noise has a bad influence on the inside of the device, that is, a malfunction of the electronic device itself, even if it does not adversely affect the outside.
【００１０】そこで、本発明の課題は、２次放射ノイズ
を発生させることなく外部への電磁波の漏洩を防止した
携帯用電子機器を提供することにある。It is an object of the present invention to provide a portable electronic device in which leakage of electromagnetic waves to the outside is prevented without generating secondary radiation noise.
【００１１】[0011]
【課題を解決するための手段】本発明では、近年の電子
機器の高速・高周波・デジタル化も考慮し、従来材料で
はカバーし難い、より高い周波数の電磁波も吸収できる
材料により、携帯用電子機器の筐体を構成するものであ
る。According to the present invention, portable electronic equipment is made of a material which is difficult to cover with conventional materials and which can absorb higher-frequency electromagnetic waves, in consideration of high-speed, high-frequency and digitalization of recent electronic equipment. Of the case.
【００１２】即ち、筐体の少なくても一部が軟磁性体粉
末と有機結合剤からなる複合磁性体で構成されることを
特徴とする携帯用電子機器の提供である。前記筐体の少
なくても一部が前記複合磁性体と導電体層との多層構造
を為し、且つ前記携帯用電子機器から見て前記複合磁性
体が常に導電体層の内側にも位置している関係にあるこ
とにより、透過減衰特性を更に向上させることが可能と
なる。これは、複合磁性体の全てが導電体層の内側にあ
るということではなく、例えば、導電体層の内側にも外
側にも存在する関係でも良いが、内側には必ず配置され
るということを意味している。また、材料として前記軟
磁性体粉末が表面に酸化皮膜を有する金属磁性体粉末で
あり、前記複合磁性体の表面抵抗が１０3Ω以上である
こと、前記複合磁性体が周波数の互いに異なる磁気共鳴
を少なくとも２つ有することを具備する材料を用いれ
ば、より高い周波数で効果的に電磁波を吸収することが
可能となる。That is, the present invention provides a portable electronic device characterized in that at least a part of the housing is made of a composite magnetic material composed of a soft magnetic powder and an organic binder. At least a part of the housing forms a multilayer structure of the composite magnetic body and the conductor layer, and the composite magnetic body is always located inside the conductor layer as viewed from the portable electronic device. With such a relationship, the transmission attenuation characteristics can be further improved. This does not mean that all of the composite magnetic body is inside the conductor layer, but it may be, for example, that the composite magnetic body exists both inside and outside the conductor layer, but that it is always arranged inside. Means. Further, the soft magnetic material powder is a metal magnetic material powder having an oxide film on the surface, the composite magnetic material has a surface resistance of 10 3 Ω or more, and the composite magnetic material has different magnetic resonance frequencies. When a material having at least two is used, electromagnetic waves can be effectively absorbed at a higher frequency.
【００１３】[0013]
【発明の実施の形態】以下に、本発明の実施の形態をノ
ートパソコンを例にとって説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below using a notebook personal computer as an example.
【００１４】図１は、ノートパソコンの使用時の外観斜
視図である。ノートパソコンは、大きく分けて、ＣＰＵ
を含む本体回路構成部、ハードディスク、液晶等による
ディスプレー３（駆動回路部を含む）、キーボード４か
らなり、外側は全体が筐体２で被われ、開いたときにデ
ィスプレー３と、キーボード４が前面にくるような折り
畳み構造を取っている。FIG. 1 is an external perspective view of the notebook personal computer when it is used. Notebook computers are roughly divided into CPUs
, A hard disk, a liquid crystal display 3 (including a drive circuit), and a keyboard 4. The outside is entirely covered with a housing 2, and when opened, the display 3 and the keyboard 4 are on the front. It has a foldable structure.
【００１５】従来、ＡＢＳ等の樹脂で作られていた筐体
２は、本発明により、表面に酸化皮膜を有する金属磁性
体粉末と有機結合剤からなる複合磁性体によって作られ
ている。ここでは、使用時に外部に対して開かれた状態
となるキーボードや画面フレーム等についても筐体の一
部と見なしている。実施の形態として、前記複合磁性体
単独で構成したものと、より電磁波の吸収効果を上げる
ため中間に導電体層を設けた多層構造で構成したものと
がある。The housing 2 conventionally made of a resin such as ABS is made of a composite magnetic material comprising a metal magnetic powder having an oxide film on its surface and an organic binder according to the present invention. Here, a keyboard, a screen frame, and the like that are opened to the outside when used are also regarded as a part of the housing. As an embodiment, there are a structure composed of the composite magnetic material alone and a structure composed of a multi-layer structure in which a conductive layer is provided in the middle to further enhance the electromagnetic wave absorbing effect.
【００１６】本発明に用いた軟磁性体粉末と有機結合剤
について表１に示す。軟磁性体粉末は、酸素分圧２０％
の窒素−酸素混合ガス雰囲気中で気相酸化し、表面に酸
化皮膜を形成する。これらを加熱混練、加圧成形して成
形体を得た。Table 1 shows the soft magnetic powder and the organic binder used in the present invention. The soft magnetic powder has an oxygen partial pressure of 20%
In a nitrogen-oxygen mixed gas atmosphere to form an oxide film on the surface. These were heated and kneaded and pressed to obtain a molded body.
【００１７】 [0017]
【００１８】この複合磁性体の表面抵抗率を測定した結
果、１×１０6Ωであった。なお、種々、複合磁性体の
表面抵抗率を検討したところ、図４に示すような表面抵
抗率と透過減衰レベルと結合レベルとの関係が得られ
た。図４より、電磁波を外部に透過させず、かつ、内部
に反射させないためには、複合磁性体の表面抵抗率は、
１０3Ω以上であればよいことがわかった。Ａは結合レ
ベル、Ｂは透過減衰レベルを示す。The surface resistivity of the composite magnetic material was measured and found to be 1 × 10 6 Ω. When the surface resistivity of various composite magnetic materials was examined, the relationship between the surface resistivity, the transmission attenuation level, and the coupling level as shown in FIG. 4 was obtained. From FIG. 4, the surface resistivity of the composite magnetic material is set so that the electromagnetic wave is not transmitted to the outside and is not reflected inside.
It turned out that it is sufficient if it is 10 3 Ω or more. A indicates the coupling level, and B indicates the transmission attenuation level.
【００１９】又、図２は、上記複合磁性体のμ−ｆ特性
を測定した結果である。実線がアニール処理後のμ特
性、破線がアニール処理前のμ特性を示す。アニール処
理前の複合磁性体は、図２に示すように、磁気共鳴に伴
うμ”のピークが現れており、磁気共鳴が２箇所で起こ
っていることが伺える。これをアニール処理すると、
μ”が広い範囲で高い値を示し、μ’も高い周波数で大
きな値を示すようになる。FIG. 2 shows the results of measuring the μ-f characteristics of the composite magnetic material. The solid line shows the μ characteristic after annealing, and the broken line shows the μ characteristic before annealing. In the composite magnetic material before the annealing treatment, as shown in FIG. 2, a peak of μ ″ accompanying magnetic resonance appears, which indicates that magnetic resonance occurs at two places.
μ ″ shows a high value in a wide range, and μ ′ also shows a large value at a high frequency.
【００２０】[0020]
（実施例１）前記複合磁性体で平均肉厚が１.２ｍｍの
筐体を形成した。(Example 1) A housing having an average thickness of 1.2 mm was formed from the composite magnetic material.
【００２１】（実施例２）前記複合磁性体を２層として
中間に導電体層としてニッケルメッシュを挟み込み、多
層構造とし、トータルの平均肉厚が１.２ｍｍの筐体を
形成した。ニッケルメッシュは、１００メッシュでｔ＝
０.１ｍｍのものを用いた。(Example 2) A two-layer composite magnetic body was sandwiched in between with a nickel mesh as a conductor layer to form a multilayer structure, and a casing having a total average thickness of 1.2 mm was formed. Nickel mesh is t = 100 mesh
The thing of 0.1 mm was used.
【００２２】評価は、実施例の筐体の平均肉厚と同じ厚
さ１.２ｍｍの評価試料２０を用いて、それぞれ透過減
衰レベル及び結合レベルの測定を行った。測定装置は、
図５（ａ）、図５（ｂ）に示すように、電磁界波源用発
信器２１と電磁界強度測定器（受信用素子）２２と、そ
れぞれループ径２ｍｍ以下の電磁界送信用微小ループア
ンテナ２３及び電磁界受信用微小ループアンテナ２４を
接続した装置を用いた。透過減衰レベルの測定は、図５
（ａ）に示すように、電磁界送信用微小ループアンテナ
２３と電磁界受信用微小ループアンテナ２４との間に試
料を位置させた。In the evaluation, a transmission attenuation level and a coupling level were measured using an evaluation sample 20 having a thickness of 1.2 mm, which is the same as the average thickness of the casing of the embodiment. The measuring device is
As shown in FIGS. 5 (a) and 5 (b), an electromagnetic wave source oscillator 21 and an electromagnetic field strength measuring device (receiving element) 22 each have a small loop antenna for transmitting electromagnetic fields having a loop diameter of 2 mm or less. 23 and a small loop antenna 24 for electromagnetic field reception were used. The measurement of the transmission attenuation level is shown in FIG.
As shown in (a), the sample was positioned between the electromagnetic field transmitting minute loop antenna 23 and the electromagnetic field receiving minute loop antenna 24.
【００２３】結合レベルの測定では、図５（ｂ）のよう
に、試料の一面と電磁界送信用微小ループアンテナ２３
及び電磁界受信用微小ループアンテナ２４とを対向させ
た。電磁界強度測定器２２には、図示しないスペクトラ
ムアナライザが接続されており、試料が存在しない状態
での電磁界強度を基準として測定を行った。In the measurement of the coupling level, as shown in FIG. 5B, one surface of the sample and the small loop antenna 23 for electromagnetic field transmission are used.
And the minute loop antenna 24 for electromagnetic field reception. A spectrum analyzer (not shown) is connected to the electromagnetic field strength measuring device 22, and the measurement is performed based on the electromagnetic field strength in a state where no sample exists.
【００２４】前述の方法で測定した透過減衰レベルを図
３（ａ）に、結合レベルを図３（ｂ）に示す。実施例１
が、実施例２が、比較例としてｔ＝０.３ｍｍのス
テンレス板がで示してある。これによると、実施例１
では、透過減衰レベル、結合レベルは共に減少してい
る。また、実施例２では、透過減衰レベルがいっそう減
少し、遮蔽吸収効果が高まっていることが分かる。結合
レベルは、実施例１ほどではないが、これも減少してい
ることが分かる。これに対して、比較例では、透過減衰
レベルは非常に減少しているが、結合レベルが高くなっ
ているのが分かる。以上の結果から、本発明による筐体
は、反射による２次放射ノイズを引き起こすことなく効
果的に放射ノイズを除去することができた。FIG. 3A shows the transmission attenuation level measured by the above-described method, and FIG. 3B shows the coupling level. Example 1
However, in Example 2, a stainless steel plate with t = 0.3 mm is shown as a comparative example. According to this, Example 1
In, both the transmission attenuation level and the coupling level are reduced. In addition, in Example 2, it can be seen that the transmission attenuation level is further reduced and the shielding and absorbing effect is enhanced. It can be seen that the coupling level is also reduced, although not as much as in Example 1. On the other hand, in the comparative example, the transmission attenuation level is greatly reduced, but the coupling level is high. From the above results, the housing according to the present invention was able to effectively remove radiation noise without causing secondary radiation noise due to reflection.
【００２５】本実施例では、ニッケルメッシュを挟み込
むことで導電体層を設けたが、金属箔の挟み込み、無電
解メッキや蒸着による導電体膜を形成する方法、導電体
粉末と有機結合剤を混練して導電性複合体を作り複合磁
性体層との多層構造を実現する方法など、導電体層との
多層化の方法は様々有り、表層に導電体層を設けるので
なければ、どの方法を採っても良い。更に、通常の樹脂
層、導電体層、複合磁性体層を順次積層して多層化する
ような導電体層、複合磁性体層以外の層を設けても差し
支えない。また、層数も実施例の３に限定するものでは
ない。In this embodiment, the conductor layer is provided by sandwiching a nickel mesh. However, a method of sandwiching a metal foil, forming a conductor film by electroless plating or vapor deposition, and kneading a conductor powder and an organic binder. There are various methods of multilayering with a conductive layer, such as a method of forming a conductive composite to form a multilayer structure with a composite magnetic layer, and any method is adopted unless a conductive layer is provided on the surface layer. May be. Further, a layer other than a conductor layer and a composite magnetic layer in which a normal resin layer, a conductor layer, and a composite magnetic layer are sequentially laminated to form a multilayer may be provided. Further, the number of layers is not limited to three in the embodiment.
【００２６】本発明の実施の形態をノートパソコンを例
にとって説明したが、ビデオカメラ、ＣＤプレーヤー、
携帯情報端末（ＰＤＡ）、携帯テレビ、携帯ゲーム等に
おいても、同様の効果が得られている。Although the embodiment of the present invention has been described by taking a notebook personal computer as an example, a video camera, a CD player,
Similar effects are obtained in portable information terminals (PDAs), portable televisions, portable games, and the like.
【００２７】[0027]
【発明の効果】本発明によれば、携帯用電子機器に求め
られる、小型、軽量化を損なわずに、２次放射ノイズの
発生をも抑制し、外部への電磁波の漏洩を低減できる。
電磁波の漏洩を低減することにより、携帯用電子機器の
使用可能範囲が拡大され、「携帯用」の利点が活かされ
ることになる。According to the present invention, the generation of secondary radiation noise can be suppressed and the leakage of electromagnetic waves to the outside can be reduced without impairing the size and weight reduction required for portable electronic equipment.
By reducing the leakage of electromagnetic waves, the usable range of the portable electronic device is expanded, and the advantage of “portable” is utilized.
【図１】本発明のノートパソコンを説明する図。図１
（ａ）は外観斜視図、図１（ｂ）は、筐体に使用する複
合磁性体の多層構造の場合の断面拡大図。FIG. 1 illustrates a notebook computer of the present invention. FIG.
1A is an external perspective view, and FIG. 1B is an enlarged cross-sectional view in the case of a multilayer structure of a composite magnetic body used for a housing.
【図２】本発明に使用する複合磁性体のμ−ｆ特性図。FIG. 2 is a μ-f characteristic diagram of a composite magnetic material used in the present invention.
【図３】本発明の実施例の効果を示す図。図３（ａ）
は、透過減衰レベルを示す図、図３（ｂ）は結合レベル
を示す図。FIG. 3 is a diagram showing the effect of the embodiment of the present invention. FIG. 3 (a)
FIG. 3 is a diagram showing a transmission attenuation level, and FIG. 3B is a diagram showing a coupling level.
【図４】表面抵抗率と結合レベル、及び透過減衰レベル
の関係を示す図。FIG. 4 is a diagram showing a relationship between a surface resistivity, a coupling level, and a transmission attenuation level.
【図５】評価方法の説明図。図５（ａ）は、透過減衰レ
ベルの測定方法を示す説明図、図５（ｂ）は、結合レベ
ルの測定方法を示す説明図。FIG. 5 is an explanatory diagram of an evaluation method. FIG. 5A is an explanatory diagram showing a method for measuring a transmission attenuation level, and FIG. 5B is an explanatory diagram showing a method for measuring a coupling level.
１ 携帯用電子機器 ２ 筐体 ３ ディスプレイ画面 ４ キーボード ５ 複合磁性体 ６ 導電体層 ２０ 評価試料 ２１ 電磁界波源用発信器 ２２ 電磁界強度測定器 ２３ 電磁界送信用微小ループアンテナ ２４ 電磁界受信用微小ループアンテナ DESCRIPTION OF SYMBOLS 1 Portable electronic device 2 Housing 3 Display screen 4 Keyboard 5 Composite magnetic body 6 Conductive layer 20 Evaluation sample 21 Transmitter for electromagnetic field wave source 22 Electromagnetic field intensity measuring instrument 23 Micro loop antenna for electromagnetic field transmission 24 Electromagnetic field reception Small loop antenna
Claims (4)
有機結合剤からなる複合磁性体で構成されることを特徴
とする携帯用電子機器。1. A portable electronic device characterized in that at least a part of a housing is composed of a composite magnetic material comprising a soft magnetic material powder and an organic binder.
性体と導電体層との多層構造を為し、且つ前記携帯用電
子機器から見て、前記複合磁性体が常に導電体層の内側
にも位置している関係にあることを特徴とする請求項１
項記載の携帯用電子機器。2. At least a part of the housing forms a multilayer structure of the composite magnetic body and a conductive layer, and the composite magnetic body is always formed of a conductive layer when viewed from the portable electronic device. 2. A relationship which is also located inside the space.
Portable electronic device according to the item.
する金属磁性体粉末からなる、前記複合磁性体の表面抵
抗率が１０3Ω以上であることを特徴とする請求項１項
または２項記載の携帯用電子機器。3. The composite magnetic body according to claim 1, wherein the soft magnetic body powder is made of a metal magnetic body powder having an oxide film on its surface, and the composite magnetic body has a surface resistivity of 10 3 Ω or more. Portable electronic device according to the item.
とも２つ以上有する複合磁性体を用いることを特徴とす
る請求項１項ないし３項のいずれかに記載の携帯用電子
機器。4. The portable electronic device according to claim 1, wherein a composite magnetic material having at least two or more magnetic resonances having different frequencies is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8274144A JPH1098274A (en) | 1996-09-24 | 1996-09-24 | Portable electronic devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8274144A JPH1098274A (en) | 1996-09-24 | 1996-09-24 | Portable electronic devices |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1098274A true JPH1098274A (en) | 1998-04-14 |
| JPH1098274A5 JPH1098274A5 (en) | 2005-06-02 |
Family
ID=17537645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8274144A Pending JPH1098274A (en) | 1996-09-24 | 1996-09-24 | Portable electronic devices |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1098274A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02239700A (en) * | 1989-03-14 | 1990-09-21 | Toppan Printing Co Ltd | Radio wave absorber |
| JPH02148330U (en) * | 1989-05-18 | 1990-12-17 | ||
| JPH04352498A (en) * | 1991-05-30 | 1992-12-07 | Mitsui Toatsu Chem Inc | Insulation paste for electromagnetic shield with high permeability |
| JPH06120689A (en) * | 1991-12-24 | 1994-04-28 | Tdk Corp | Radio wave absorber |
| JPH07212079A (en) * | 1994-01-20 | 1995-08-11 | Tokin Corp | Electromagnetic interference suppressor |
| JPH08204380A (en) * | 1995-01-31 | 1996-08-09 | Tokin Corp | Noise suppression method in electronic device and noise suppression type electronic device applying the same |
-
1996
- 1996-09-24 JP JP8274144A patent/JPH1098274A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02239700A (en) * | 1989-03-14 | 1990-09-21 | Toppan Printing Co Ltd | Radio wave absorber |
| JPH02148330U (en) * | 1989-05-18 | 1990-12-17 | ||
| JPH04352498A (en) * | 1991-05-30 | 1992-12-07 | Mitsui Toatsu Chem Inc | Insulation paste for electromagnetic shield with high permeability |
| JPH06120689A (en) * | 1991-12-24 | 1994-04-28 | Tdk Corp | Radio wave absorber |
| JPH07212079A (en) * | 1994-01-20 | 1995-08-11 | Tokin Corp | Electromagnetic interference suppressor |
| JPH08204380A (en) * | 1995-01-31 | 1996-08-09 | Tokin Corp | Noise suppression method in electronic device and noise suppression type electronic device applying the same |
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