JPS59205834A - Radio communication system in radio wave shielding building - Google Patents
Radio communication system in radio wave shielding buildingInfo
- Publication number
- JPS59205834A JPS59205834A JP58080561A JP8056183A JPS59205834A JP S59205834 A JPS59205834 A JP S59205834A JP 58080561 A JP58080561 A JP 58080561A JP 8056183 A JP8056183 A JP 8056183A JP S59205834 A JPS59205834 A JP S59205834A
- Authority
- JP
- Japan
- Prior art keywords
- building
- radio wave
- radio
- glass
- material body
- 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.)
- Granted
Links
- 239000011521 glass Substances 0.000 claims abstract description 18
- 239000005357 flat glass Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000002344 surface layer Substances 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract description 9
- 239000013307 optical fiber Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 239000000843 powder Substances 0.000 description 4
- 239000003973 paint Substances 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000005338 frosted glass Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Near-Field Transmission Systems (AREA)
- Radio Transmission System (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、建物内部の空間が外部空間と電磁シールドさ
れ、建物の外部空間へ漏洩する電波の電界強度を一定基
準以下とした電波遮蔽建物内における無線通信方式に関
する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wireless communication system in a radio wave shielding building in which the space inside the building is electromagnetically shielded from the outside space and the field strength of radio waves leaking into the outside space of the building is below a certain standard.
一般に建物の内部に設置した無線装置を利用して当該建
物の中だけの無線通信を□行う場合には、当該建物の壁
面がコンクリートのような電波を減衰し、遮蔽するもの
であっても、窓部が電（丑遮蔽されてない窓ガラスであ
るがために。In general, when wireless communication is performed only within a building using a wireless device installed inside the building, even if the wall of the building is made of concrete that attenuates and blocks radio waves, This is because the windows are made of glass that is not shielded from electricity.
当該建物の外部からの送信電波がこの窓ガラスを通じて
当該建物内へ入射する。また、当該建物内部に設置した
建物内通信用の無線装置の送信出力を大きくすると、窓
ガラスが電磁的に遮蔽されていないために、当該建物外
へ電波が輻射され８当該建物外の空間を電波妨害する。Transmitted radio waves from outside the building enter the building through the window glass. In addition, if the transmission output of a wireless device for intra-building communication installed inside the building is increased, the radio waves will be radiated outside the building because the window glass is not electromagnetically shielded8. interfere with radio waves.
また、無線装置の出力が、電波法適用外のいわゆる微弱
電波すなわち１００メートルの距離においてその電界強
度が毎メートル１５マイクロボルト以下の範囲の電波で
ある場合には、Ｓ常の変調形式をとる通信では十分なＳ
／Ｎは得られず通話品質が低下する。そこで、電波法に
基づいて免許を受けた高出力無線装置が必要となるか、
そのためには使い易いＶＨＦ帯、ＵＨＦ’帯の電波につ
いて周波数割当を受けなければならないが、これら周波
数帯の電波は、その需給が逼迫しており１ｂ、波の割当
許可をうけることが困難である。In addition, if the output of the wireless device is a so-called weak radio wave that is not subject to the Radio Law, that is, a radio wave with an electric field strength of 15 microvolts per meter or less at a distance of 100 meters, communication that uses the normal modulation format That's enough S
/N cannot be obtained and the quality of the call deteriorates. Therefore, whether a high-power wireless device licensed under the Radio Law is required, or
To do this, it is necessary to receive frequency allocation for radio waves in the VHF band and UHF' band, which are easy to use, but the supply and demand for radio waves in these frequency bands is tight and it is difficult to receive permission to allocate waves. .
したがって、上記理由等により、現状では。Therefore, due to the above reasons, etc., at present.
建物の外部との通信を必要とせず、建物内部だけで無線
通信を行うという機能の達成が遅れ気味であることは否
めない。It cannot be denied that the achievement of the ability to perform wireless communication only inside a building without requiring communication with the outside of the building is lagging behind.
本発明は、この点に鑑み、電磁遮蔽ガラスを窓部として
有する電波遮蔽建物の内部空間と外部空間とか完全に遮
断されて前記内部空間だけての無線通信か可能な電彼遜
蔽建物円無線通侶方式を提供するもので、以下にこれを
図面に基づき詳細に説明づ−る。In view of this point, the present invention provides a wireless shielding building that has electromagnetic shielding glass as a window part, and is capable of completely shielding the interior space and exterior space of a radio wave shielding building so that wireless communication can be performed only in the interior space. The system provides a communication method, which will be explained in detail below based on the drawings.
第１図は本発明方式の一実施例を示す概略的な構成図で
ある。同図において、１は電波を遮蔽するコンクリート
材質の外壁により構成した建物Δ内の一フロアで１人間
がこのフロア内で事務をとり又は作業を行っていること
が前提であるから＃元をこの建物内にとり入れる窓ガラ
ス部Ｂが設けられている。FIG. 1 is a schematic diagram showing an embodiment of the system of the present invention. In the same figure, 1 is one floor in the building Δ, which is made up of a concrete outer wall that blocks radio waves, and it is assumed that one person is doing office work or work on this floor. A window glass portion B is provided to be incorporated into the building.
この窓ガラス部Ｂは、窓ガラスが構成要素となっている
が、当該窓ガラスのガプス板体は。This window glass portion B is composed of a window glass, and the gap plate of the window glass is...
電波の遮蔽材質体をガラス表面層として形成したものと
するか又はガラス材質体に電波の遮蔽材質体を混在させ
て形成したものである。The radio wave shielding material body is formed as a glass surface layer, or the radio wave shielding material body is formed by mixing the glass material body.
このような窓ガラスを用いた前記建物の窓ガラス部Ｂは
、陽光を前記建物内にとり入れ電波を遮蔽するものであ
るから、外気と当該フロア内の空気の交換をする必要が
あるなら、一般に窓の開閉が不可能な構造形体にして別
途換気装置を完備する必要があること勿論である。最近
では、建物内の換気を、窓を閉じた状態で行い。The window glass section B of the building using such window glass allows sunlight to enter the building and blocks radio waves, so if it is necessary to exchange the outside air with the air inside the floor, generally Of course, it is necessary to have a structure in which the windows cannot be opened and closed, and to be equipped with a separate ventilation system. Recently, buildings are ventilated by keeping the windows closed.
人に対する衛生環境を完備するようにしているのが普通
であるから、窓部を陽光のとり入れのみとしてあけたり
−できない構造とすることも容易であり不自然ではな（
・。Since it is normal to provide a sanitary environment for people, it is easy and not unnatural to open the windows only to let in sunlight, or to create a structure that does not allow sunlight to enter.
・.
本発明で適用する窓ガラスは次のようなガラス板体をオ
Ｕ用することができる。The following glass plate bodies can be used as the window glass to which the present invention is applied.
電波遮蔽用としてこのガラス板体を形成するニハ、電波
遮蔽材質体としての酸化錫の超微粉とか透明酸化鉄の超
微粉で直径が０．０３μｍ程度のものを利用してガラス
板の表面に耐着させれば、陽光とり入れのための透明性
も相当程度満足１−るものが得られる。When forming this glass plate for radio wave shielding, ultrafine tin oxide powder or transparent iron oxide ultrafine powder with a diameter of about 0.03 μm is used as a radio wave shielding material to coat the surface of the glass plate. If it is coated, it will be possible to obtain a fairly satisfactory transparency for letting in sunlight.
すりガラス程度の透光性を有するものを前記窓ガラスと
して利用する場合には、前記超微粉の直径の１０倍程度
の超微粉をガラス板の表面に耐着又は混在させるように
したものでもよ（・。When using a glass with translucency comparable to that of frosted glass as the window glass, ultrafine powder with a diameter of about 10 times the diameter of the ultrafine powder may be adhered to or mixed with the surface of the glass plate (・.
このほか電波遮蔽用塗料の例えばニッケルーアクリル系
の塗料をガラス板の表面に吹きつけしたものを前記窓ガ
ラスとして利用することもできる。この塗料の膜厚が７
０μ″ｍ程度で周波数が１０００ ＭＨｚの場合、電波
減衰率が２５ｄＢ程度以上であるから電波遮蔽効果も十
分である。In addition, a radio wave shielding paint, such as a nickel-acrylic paint, sprayed onto the surface of a glass plate can also be used as the window glass. The film thickness of this paint is 7
When the frequency is 1000 MHz at about 0 μ″m, the radio wave attenuation rate is about 25 dB or more, so the radio wave shielding effect is sufficient.
第１図において、２は当該フロア内の天井等に設定され
たｎ個の固定アンテナ（中央送受信１１ｉｌ制御装置用
アンテナ）、旦は各フロアに置かれた中央送受信制御装
置であり当該装置は無線機４、操作表示部５及び交換分
配接続回路６から構成される。また、７はケーブル又は
光ファイバ、８はｍ個の端末装置用アンテナ、旦は受信
用端末装置であり、この旦には１図示のポケットベル９
１．携帯無線電話機９２．ラジオ９３及びテレビ９４の
ほか、コードレス電話機（回転型ダイヤル、押しボタン
ダイヤル）、コードレスボタン電話機、ファクシミリ、
コンビーータ端末等も含む。ここで、ラジオ、テレビ、
ファクシミリ。In Figure 1, 2 is the n number of fixed antennas (antennas for the central transmitting/receiving 11il control device) set on the ceiling of the floor, 2 is the central transmitting/receiving control device placed on each floor, and the device is wireless. It consists of a machine 4, an operation display section 5, and an exchange distribution connection circuit 6. In addition, 7 is a cable or optical fiber, 8 is an antenna for m terminal devices, 1 is a receiving terminal device, and 1 is a pager 9 shown in the figure.
1. Portable wireless telephone 92. In addition to radio 93 and television 94, cordless telephones (rotary dial, push button dial), cordless button telephones, facsimiles,
Also includes converter terminals, etc. Here, radio, television,
facsimile.
コンヒュークＲＡ末、 ポケットベル、コードレス電
話（コードレス電話機、コードレスボタン電話機）、携
帯無線電話等はフロア−内で移動して使用することが可
能である。Confuc RA terminals, pagers, cordless telephones (cordless telephones, cordless button telephones), portable radio telephones, etc. can be moved and used within the floor.
これらの端末装置は他の階層のフロアにも備え付けられ
ている。本発明でいう建物内の通信にはフロア１内での
通話・通信と当該フロア外との通話・通信がある。先ず
当該フロア１内での通話・通信についていうと、各端末
９１，９゜＋ ９３ 、＋ ’９４等からコール（Ｃａ
ｌｌ）された信硲が端末装置用アノテナ８を通り、中央
送受信制御装置用アンテナ２で受信され、中央送受信制
御装置旦に送られ。These terminal devices are also installed on other floors. Communication within the building as referred to in the present invention includes calls and communications within the floor 1 and calls and communications outside the floor. First, regarding calls and communications within the floor 1, calls (Ca
ll) The received message passes through the terminal device antenna 8, is received by the central transmission and reception control device antenna 2, and is sent to the central transmission and reception control device.
交換分配接続回路６を通り、操作表示部５に表示される
と同時に無線機４を通りアンテナ２を通して、受信用端
末装置♀に送られ、当該経路により端末間の通話・通信
が可能となる。The signal passes through the exchange/distribution connection circuit 6, is displayed on the operation display section 5, and simultaneously passes through the radio device 4, passes through the antenna 2, and is sent to the receiving terminal device #, thereby making it possible to make calls and communicate between the terminals through this route.
また、当該フロア外との交信は、各端末旦からコールさ
れた信号が中央送受信制御装置旦を辿り、ケーブルまた
は元ファイバーの７を通じ。In addition, for communication with outside the floor, signals called from each terminal are routed to the central transmission/reception control unit through cables or original fibers.
他のフロアへ伝送され、同一フロア内の通話・通信と同
様な方法で通話・通信が可能となる。It is transmitted to other floors, and calls and communications can be made in the same way as calls and communications within the same floor.
第２図は建物全体が電波遮蔽された当該建物内の各フロ
ア相互で通信を行つ場合の他の実施例を示す、構成図で
、建物外に設置した当該建物外への送信アンテナ１１］
及び受信アンテナ１１゜により送受信された電波はビル
中央制御中継装置１０を介して１例えはフロアのＩＦ−
ＮＦそれぞれに設置されている第１図と同様の中央送受
信制御装置ｑを経て建物内アンテナにより各端末９□〜
９ｏとの通信が行える。同図のＢＩＦは地下１階を示す
。第１図に対応する記号は同一機能を呈するものである
。なお、１１１及び１１２は送受兼用アンテナとしても
よいこと勿論である。FIG. 2 is a configuration diagram showing another embodiment in which communication is performed between each floor in a building where the entire building is shielded from radio waves, and includes a transmitting antenna 11 installed outside the building.
The radio waves transmitted and received by the receiving antenna 11° are transmitted via the building central control relay device 10 to the IF-IF on the floor.
Each terminal 9--
Can communicate with 9o. BIF in the figure indicates the first basement floor. Symbols corresponding to FIG. 1 represent the same functions. Incidentally, it goes without saying that 111 and 112 may be used as transmitting and receiving antennas.
第３図は他の実施例を示す概略図で、異なる電波遮蔽建
物が複数個あって全ての建物の空間を共同空間として使
用する実施態様を示したものである。同図において、７
は第１図及び第２図に対応する記号であるが、各ビル間
を共通の空間で利用するためケーブル（金属ケーブル）
又は光ファイバ（又は光ケーブル）７を用℃・てビル相
互間を接続しである。FIG. 3 is a schematic diagram showing another embodiment, in which there are a plurality of different radio wave shielding buildings and the spaces of all the buildings are used as a common space. In the same figure, 7
is a symbol corresponding to Figures 1 and 2, but cables (metal cables) are used to connect buildings in a common space.
Alternatively, optical fibers (or optical cables) 7 can be used to connect buildings.
第４図は電波遮蔽建物内の無勝通信系を説明するための
図で、７は当該建物外と電詰局又は第３図の他の電波遮
蔽建物に設置されている１）ＢＸへ接続するための金属
ケーブル又は元ケーブルである。インターフェース１２
．は当該建物内に設置の無線機４１〜４ｎ と電波漏洩
ケーブル１３との接続を行うものであって、これにより
図示の各端末との通信・通話を行うようにしたものであ
る。インターフェース１２□は当該建物外に設置のアン
テナ１１．及び１１２と無線機４．〜４ｎのインタフェ
ースをとるためのものである。Figure 4 is a diagram to explain the non-win communication system inside the radio wave shielding building, and 7 is the connection between the outside of the building and the 1) BX installed at the power station or other radio wave shielding building in Figure 3. It is a metal cable or original cable for use. Interface 12
．． 1 is used to connect the wireless devices 41 to 4n installed in the building with the radio wave leakage cable 13, thereby allowing communication and phone calls to be made with each of the terminals shown. The interface 12□ is the antenna 11. installed outside the building. and 112 and radio 4. -4n interface.
以」二の各実施例での使用電波は、電波３ｇ蔽建物外・
＼の漏洩がないようにしたものであり、従ってその１す
（定範囲である限り当該使用電波の周波数設定及び送信
電力の設定が自由である。The radio waves used in each of the following examples are 3G radio waves outside the building.
Therefore, as long as the frequency and transmission power of the radio waves used are within a certain range, the frequency and transmission power can be set freely.
以−１−゛述べたところから明らかなように１本発ｔ’
Ｊｌによるどきは、電波遮蔽建物の内部空間と外部空間
が遮断される結果、前述の周波数及び送信電力の自由な
設定は勿論、各種変調形式の採用により各棟娼末機への
配線が不要、しかも偏１末（幾を業務の必要に応じてフ
ロア−内て゛自由に４多動して辿昌占・：１山イ言てき
ろ′飄波既蔽建１勿内での’）ｊｊｌ、勝送受化系の確
立により、有線送受信系による場合と異なり配線設備・
工事のローコスト化とスリ℃・よってその効果は顕著な
るものがある。As is clear from the above-1-゛ description, one shot t'
As a result of the radio wave-shielding building's internal and external spaces being cut off, JL allows for free settings of the frequency and transmission power mentioned above, as well as the adoption of various modulation formats, eliminating the need for wiring to the brothels in each building. What's more, the end of the story (how many people are free to move freely on the floor according to the needs of their work). With the establishment of a successful transmission and reception system, wiring equipment and
The effects of lower construction costs and pickpockets are significant.
第１図は９不発明方式の一実施例を示ず概略的構成図、
第２図及び第３図はいずれも他の実施例を／ｒｅ ’Ｉ
−図、第４図は電波遮蔽建物内の無線通信系を説すコす
るための図である。
Ａ・・・電波遮蔽建物、１・・・電波を遮蔽するコンク
リート材質の外壁により構成した建物Ａ内の一フロア、
Ｂ・・・窓ガラス部、４ ・無線装置（又は無想機〕、
旦 ポケットベル９１．携帯電話９．。
ラジオ９４６．テレビ９４等よりなる端末装置。
特許出願人 日本無線株式会社FIG. 1 is a schematic configuration diagram that does not show an example of the 9-inventive system;
Both Figures 2 and 3 show other embodiments.
- Figure 4 is a diagram for explaining a wireless communication system in a radio wave shielded building. A...Radio wave shielding building, 1...One floor in building A consisting of an outer wall made of concrete material that shields radio waves,
B...Window glass part, 4 ・Wireless device (or Musouki),
Dan pager91. Mobile phone9. . Radio 946. A terminal device consisting of a television 94, etc. Patent applicant Japan Radio Co., Ltd.
Claims (1)
建物の窓ガラス部を、電波の遮蔽材質体をガラス表面層
として形成したガラス板体又はガラス材質体に電波の遮
蔽材質体を混在させて形成したガラス板体により構成す
ることにより、当該建物の外部からの電波の入射が殆ん
どない空間を当該建物内に作り、当該建物内部に設置し
た無線装置と、当該建物内部のラジオ。 テレビ、ポケットベル、コードレス電話機、携帯法 無線電話機等とにより当建物内部での通信を行△ い当該建物外部への電波の漏洩をなくすようにしたこと
を特徴とする電波遮蔽建物内無線通信方式。[Scope of Claims] A window glass portion of a building consisting of an external wall made of concrete material that shields radio waves may be a glass plate body formed with a radio wave shielding material body as a glass surface layer, or a glass material body with a radio wave shielding material body formed as a glass surface layer. By constructing a glass plate body made of mixed materials, a space is created within the building in which almost no radio waves enter from outside the building, and wireless equipment installed inside the building can be connected to the inside of the building. radio. △ Radio wave shielding in-building wireless communication system characterized by eliminating the leakage of radio waves to the outside of the building when communicating inside the building using televisions, pagers, cordless telephones, mobile radio telephones, etc. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58080561A JPS59205834A (en) | 1983-05-09 | 1983-05-09 | Radio communication system in radio wave shielding building |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58080561A JPS59205834A (en) | 1983-05-09 | 1983-05-09 | Radio communication system in radio wave shielding building |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59205834A true JPS59205834A (en) | 1984-11-21 |
| JPS641958B2 JPS641958B2 (en) | 1989-01-13 |
Family
ID=13721747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58080561A Granted JPS59205834A (en) | 1983-05-09 | 1983-05-09 | Radio communication system in radio wave shielding building |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59205834A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62112427A (en) * | 1985-11-12 | 1987-05-23 | Shimizu Constr Co Ltd | Radio communication system in intelligent building |
| JPS62230230A (en) * | 1986-03-31 | 1987-10-08 | Shimizu Constr Co Ltd | Radio communication system in intelligent |
| JPS63173423A (en) * | 1987-01-12 | 1988-07-18 | Tokyu Constr Co Ltd | Electromagnetic wave shield duct system in building |
| JPS63197399A (en) * | 1987-01-13 | 1988-08-16 | 間久部 六郎 | Building for containing wave utilization facility |
| JPS63219197A (en) * | 1987-03-06 | 1988-09-12 | 日本無線株式会社 | Construction of radio communication in building shielded from wave |
| JPS6418321A (en) * | 1987-07-14 | 1989-01-23 | Mirai Bill Kenkyu Kaihatsu Kk | Information transmission and reception device |
| JPH01218225A (en) * | 1988-02-26 | 1989-08-31 | Anritsu Corp | Optical communication device |
| US5339184A (en) * | 1992-06-15 | 1994-08-16 | Gte Laboratories Incorporated | Fiber optic antenna remoting for multi-sector cell sites |
| JPH07122881A (en) * | 1993-10-28 | 1995-05-12 | Nec Corp | Shield room |
| US5594579A (en) * | 1991-12-26 | 1997-01-14 | Motorola, Inc. | Radio permitting information transfer between radio frequency shielded sub-systems |
-
1983
- 1983-05-09 JP JP58080561A patent/JPS59205834A/en active Granted
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62112427A (en) * | 1985-11-12 | 1987-05-23 | Shimizu Constr Co Ltd | Radio communication system in intelligent building |
| JPS62230230A (en) * | 1986-03-31 | 1987-10-08 | Shimizu Constr Co Ltd | Radio communication system in intelligent |
| JPS63173423A (en) * | 1987-01-12 | 1988-07-18 | Tokyu Constr Co Ltd | Electromagnetic wave shield duct system in building |
| JPS63197399A (en) * | 1987-01-13 | 1988-08-16 | 間久部 六郎 | Building for containing wave utilization facility |
| JPS63219197A (en) * | 1987-03-06 | 1988-09-12 | 日本無線株式会社 | Construction of radio communication in building shielded from wave |
| JPS6418321A (en) * | 1987-07-14 | 1989-01-23 | Mirai Bill Kenkyu Kaihatsu Kk | Information transmission and reception device |
| JPH0353821B2 (en) * | 1987-07-14 | 1991-08-16 | ||
| JPH01218225A (en) * | 1988-02-26 | 1989-08-31 | Anritsu Corp | Optical communication device |
| US5594579A (en) * | 1991-12-26 | 1997-01-14 | Motorola, Inc. | Radio permitting information transfer between radio frequency shielded sub-systems |
| US5339184A (en) * | 1992-06-15 | 1994-08-16 | Gte Laboratories Incorporated | Fiber optic antenna remoting for multi-sector cell sites |
| JPH07122881A (en) * | 1993-10-28 | 1995-05-12 | Nec Corp | Shield room |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS641958B2 (en) | 1989-01-13 |
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