JP2800782B2 - Electromagnetic wave leakage prevention device - Google Patents
Electromagnetic wave leakage prevention deviceInfo
- Publication number
- JP2800782B2 JP2800782B2 JP8147608A JP14760896A JP2800782B2 JP 2800782 B2 JP2800782 B2 JP 2800782B2 JP 8147608 A JP8147608 A JP 8147608A JP 14760896 A JP14760896 A JP 14760896A JP 2800782 B2 JP2800782 B2 JP 2800782B2
- Authority
- JP
- Japan
- Prior art keywords
- electromagnetic wave
- crt screen
- phase
- prevention device
- antenna
- 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]
【発明の属する技術分野】本発明は、ＣＲＴ画面から発
生する電磁波の漏洩を防止するための電磁波漏洩防止装
置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave leakage prevention device for preventing electromagnetic waves generated from a CRT screen from leaking.
【０００２】[0002]
【従来の技術】近年、コンピュータの普及に伴い、コン
ピュータの端末装置としてＣＲＴがひじょうに多く使用
されている。2. Description of the Related Art In recent years, with the spread of computers, CRTs have been widely used as terminal devices for computers.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、ＣＲＴ
画面からは電磁波が発生し、この電磁波は人体に影響を
及ぼすらしいと言われている。また、この電磁波から重
要な情報が盗まれるおそれもある。However, the CRT
Electromagnetic waves are generated from the screen, and it is said that these electromagnetic waves seem to affect the human body. Also, important information may be stolen from this electromagnetic wave.
【０００４】[0004]
【発明の目的】そこで、本発明の目的は、ＣＲＴ画面か
ら発生する電磁波の漏洩を防止できる、電磁波漏洩防止
装置を提供することにある。SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an electromagnetic wave leakage prevention device capable of preventing electromagnetic waves generated from a CRT screen from leaking.
【０００５】[0005]
【課題を解決するための手段】本発明者は、ＣＲＴ画面
から発生する電磁波の漏洩を防止する技術について研究
を重ねた結果、ＣＲＴ画面から発生する電磁波と逆位相
の電磁波を、ＣＲＴ画面へ向けて照射すると、これらの
電磁波が互いに打ち消し合うことを見い出した。本発明
はこの知見に基づいてなされたものである。The inventor of the present invention has conducted research on techniques for preventing leakage of electromagnetic waves generated from a CRT screen. As a result, the present inventors have directed electromagnetic waves having the opposite phase to the electromagnetic waves generated from the CRT screen to the CRT screen. And found that these electromagnetic waves canceled each other out. The present invention has been made based on this finding.
【０００６】すなわち、本発明に係る電磁波漏洩防止装
置は、ＣＲＴ画面から発生する電磁波を受信する受信ア
ンテナと、この受信アンテナで受信された電磁波の位相
を反転させた位相反転信号を出力する位相反転部と、こ
の位相反転部から出力された位相反転信号を電磁波とし
て前記ＣＲＴ画面へ向けて送信する送信アンテナと、前
記ＣＲＴ画面に被装される透光性パネルとを備え、この
透光性パネルに前記受信アンテナ及び前記送信アンテナ
が設けられ、この送信アンテナは、前記ＣＲＴ画面の大
部分に対向する四角い平面状に形成された透明導電膜か
らなるものである。また、前記透光性パネルの前記送信
アンテナを設けていない面に、当該送信アンテナから発
生した電磁波を反射させるための透明導電膜からなる反
射膜が設けられたものとしてもよい。That is, an electromagnetic wave leakage prevention device according to the present invention comprises a receiving antenna for receiving an electromagnetic wave generated from a CRT screen, and a phase inversion for outputting a phase inversion signal obtained by inverting the phase of the electromagnetic wave received by the receiving antenna. A transmitting antenna for transmitting the phase-inverted signal output from the phase-inverting unit to the CRT screen as an electromagnetic wave ;
And a translucent panel mounted on the CRT screen.
The receiving antenna and the transmitting antenna are provided on a translucent panel.
And the transmitting antenna is large in the CRT screen.
Is it a transparent conductive film formed in a square planar shape facing the part
It consists of. Further, a reflection film made of a transparent conductive film for reflecting electromagnetic waves generated from the transmission antenna may be provided on a surface of the translucent panel where the transmission antenna is not provided.
【０００７】ＣＲＴ画面から発生した電磁波の一部は、
受信アンテナで受信され、位相反転部で位相の反転した
位相反転信号に変換される。位相反転信号は、電磁波と
して送信アンテナからＣＲＴ画面へ向けて送信される。
すると、ＣＲＴ画面から発生した電磁波と送信アンテナ
から送信された電磁波とは、互いに逆位相であるため打
ち消し合う。Some of the electromagnetic waves generated from the CRT screen are:
The signal is received by the receiving antenna, and is converted into a phase inverted signal whose phase is inverted by the phase inverting unit. The phase inversion signal is transmitted from the transmitting antenna to the CRT screen as an electromagnetic wave.
Then, the electromagnetic wave generated from the CRT screen and the electromagnetic wave transmitted from the transmitting antenna cancel each other because they have opposite phases.
【０００８】[0008]
【発明の実施の形態】図１は、本発明に係る電磁波漏洩
防止装置の一実施形態を示す斜視図である。以下、この
図面に基づき説明する。FIG. 1 is a perspective view showing an embodiment of an electromagnetic wave leakage prevention device according to the present invention. Hereinafter, description will be made based on this drawing.
【０００９】電磁波漏洩防止装置は、ＣＲＴ画面１０か
ら発生する電磁波を受信する受信アンテナ１２と、受信
アンテナ１２で受信された電磁波の位相を反転させた位
相反転信号を出力する位相反転部１４と、位相反転部１
４から出力された位相反転信号を電磁波としてＣＲＴ画
面１０へ向けて送信する送信アンテナ１６とを備えてい
る。受信アンテナ１２及び送信アンテナ１６は、ＣＲＴ
画面１０に被装される透光性パネル１８に設けられてい
る。The electromagnetic wave leakage prevention device includes a receiving antenna 12 for receiving an electromagnetic wave generated from a CRT screen 10, a phase inverting unit 14 for outputting a phase inversion signal obtained by inverting the phase of the electromagnetic wave received by the receiving antenna 12, Phase inversion unit 1
And a transmission antenna 16 for transmitting the phase-inverted signal output from 4 to the CRT screen 10 as an electromagnetic wave. The receiving antenna 12 and the transmitting antenna 16 are CRT
The light-transmitting panel 18 is provided on the screen 10.
【００１０】受信アンテナ１２は、透光性パネル１８上
に、細長い棒状に形成された透明導電膜からなる。送信
アンテナ１６は、透光性パネル１８上に、四角い平面状
に形成された透明導電膜からなる。透明導電膜は、例え
ばＩＴＯやＳｎＯ2 である。受信アンテナ１２及び送信
アンテナ１６は、送受信する電磁波の周波数や要求され
る指向性によって、多様な大きさ及び形状をとり得る。
受信アンテナ１２の材質は、ＣＲＴ画面１０に表示され
る画像を妨害しない位置に設ければ、透明導電膜ではな
くアルミニウム等の金属にしてもよい。The receiving antenna 12 is formed of a transparent conductive film formed on a translucent panel 18 in the shape of an elongated rod. The transmitting antenna 16 is formed of a transparent conductive film formed on the translucent panel 18 in a square planar shape. The transparent conductive film is, for example, ITO or SnO 2 . The receiving antenna 12 and the transmitting antenna 16 can have various sizes and shapes depending on the frequency of the transmitted / received electromagnetic wave and the required directivity.
The material of the receiving antenna 12 may be a metal such as aluminum instead of the transparent conductive film as long as the material is provided at a position that does not disturb the image displayed on the CRT screen 10.
【００１１】位相反転部１４は、例えばオペアンプ等で
構成される反転増幅回路で実現でき、図示しないパーソ
ナルコンピュータ本体に内蔵させてもよい。透光性パネ
ル１８の材質は、絶縁物であって透明又は半透明の合成
樹脂やガラスである。透光性パネル１８の周囲には、両
面テープ２０１〜２０４が貼付されている。The phase inverting section 14 can be realized by an inverting amplifier circuit composed of, for example, an operational amplifier or the like, and may be incorporated in a personal computer body (not shown). The material of the translucent panel 18 is an insulating material, such as a transparent or translucent synthetic resin or glass. Around the translucent panel 18, double-sided tapes 201 to 204 are attached.
【００１２】ＣＲＴ２２は、図示しないパーソナルコン
ピュータ本体に接続され、パーソナルコンピュータ本体
から出力された画像信号に基づき、ＣＲＴ画面１０に画
像を表示する。ＣＲＴ画面１０の周囲の枠２４に両面テ
ープ２０１〜２０４を貼り付けることにより、ＣＲＴ画
面１０に透光性パネル１８が取り付けられる。The CRT 22 is connected to a personal computer (not shown), and displays an image on the CRT screen 10 based on an image signal output from the personal computer. The translucent panel 18 is attached to the CRT screen 10 by attaching the double-sided tapes 201 to 204 to the frame 24 around the CRT screen 10.
【００１３】図２は、図１の電磁波漏洩防止装置を示す
断面図である。以下、図１及び図２に基づき電磁波漏洩
防止装置の動作を説明する。FIG. 2 is a sectional view showing the electromagnetic wave leakage prevention device of FIG. Hereinafter, the operation of the electromagnetic wave leakage prevention device will be described with reference to FIGS.
【００１４】図２において、透光性パネル１８の受信ア
ンテナ１２及び送信アンテナ１６を設けていない面に
は、送信アンテナ１６から発生した電磁波を反射させる
ための透明導電膜からなる反射膜２６が設けられてい
る。In FIG. 2, a reflection film 26 made of a transparent conductive film for reflecting electromagnetic waves generated from the transmission antenna 16 is provided on a surface of the translucent panel 18 where the reception antenna 12 and the transmission antenna 16 are not provided. Have been.
【００１５】ＣＲＴ画面１０に表示された画像の可視光
は、受信アンテナ１２及び送信アンテナ１６、透光性パ
ネル１８、反射膜２６を透過して、パーソナルコンピュ
ータの操作者まで到達する。一方、ＣＲＴ画面１０から
発生した電磁波Ａの一部は、受信アンテナ１２で受信さ
れ、位相反転部１４で位相の反転した位相反転信号に変
換される。位相反転信号は、電磁波Ｂとして送信アンテ
ナ１６からＣＲＴ画面１０へ向けて送信される。する
と、逆位相の電磁波Ａ，Ｂは互いに打ち消し合うので、
電磁波Ａの漏洩が防止される。The visible light of the image displayed on the CRT screen 10 passes through the receiving antenna 12, the transmitting antenna 16, the translucent panel 18, and the reflective film 26, and reaches the operator of the personal computer. On the other hand, a part of the electromagnetic wave A generated from the CRT screen 10 is received by the receiving antenna 12 and converted into a phase inverted signal whose phase is inverted by the phase inverting unit 14. The phase inversion signal is transmitted from the transmitting antenna 16 to the CRT screen 10 as an electromagnetic wave B. Then, since the electromagnetic waves A and B of opposite phases cancel each other,
The leakage of the electromagnetic wave A is prevented.
【００１６】また、反射膜２６は、送信アンテナ１６か
ら発生する電磁波Ｂの指向性がＣＲＴ画面１０方向に十
分にあれば、必ずしも必要ではない。さらに、透光性パ
ネル１８を透過した電磁波Ａ，Ｂが互いに打ち消し合え
ば、反射膜２６を設けなくてもよい。The reflecting film 26 is not always necessary if the directivity of the electromagnetic wave B generated from the transmitting antenna 16 is sufficient in the direction of the CRT screen 10. Further, if the electromagnetic waves A and B transmitted through the translucent panel 18 cancel each other, the reflective film 26 need not be provided.
【００１７】なお、本発明に係る電磁波漏洩防止装置
は、いうまでもなく上記実施形態に限定されるものでは
なく、例えばＣＲＴであればコンピュータの端末装置に
限らずテレビ受像機等にも適用できる。また、本発明に
係る電磁波漏洩防止装置の応用例として、光も電磁波の
一種であることから、例えば太陽からの光をカットする
装置が考えられる。The electromagnetic wave leakage prevention device according to the present invention is, of course, not limited to the above-described embodiment. For example, a CRT can be applied not only to a terminal device of a computer but also to a television receiver or the like. . Further, as an application example of the electromagnetic wave leakage prevention device according to the present invention, since light is also a kind of electromagnetic wave, for example, a device for cutting light from the sun can be considered.
【００１８】[0018]
【発明の効果】本発明に係る電磁波漏洩防止装置によれ
ば、ＣＲＴ画面から発生する電磁波と逆位相の電磁波
を、ＣＲＴ画面へ向けて照射することにより、これらの
電磁波が互いに打ち消し合うので、ＣＲＴ画面から発生
する電磁波の漏洩を防止できる。したがって、電磁波の
人体に及ぼす影響を排除できるとともに、電磁波に含ま
れる重要な情報の漏出を防止できる。According to the electromagnetic wave leakage prevention device of the present invention, an electromagnetic wave having a phase opposite to that of an electromagnetic wave generated from a CRT screen is irradiated toward the CRT screen, so that these electromagnetic waves cancel each other. Leakage of electromagnetic waves generated from the screen can be prevented. Therefore, the influence of the electromagnetic waves on the human body can be eliminated, and the leakage of important information contained in the electromagnetic waves can be prevented.
【００１９】しかも、ＣＲＴ画面に被装される透光性パ
ネルを備え、この透光性パネルに受信アンテナ及び送信
アンテナを設け、この送信アンテナを前記ＣＲＴ画面の
大部分に対向する四角い平面状に形成された透明導電膜
とすることにより、ＣＲＴ画面に表示された画像の可視
光を妨げることなく、ＣＲＴ画面から発生する電磁波の
漏洩を防止できる。[0019] Moreover, with a translucent panel which is covered state to the CRT screen, the receiving antenna and the transmitting antenna to the translucent panel is provided, the transmitting antennas of the CRT screen
By using a transparent conductive film formed in a square planar shape opposed to most, leakage of electromagnetic waves generated from the CRT screen can be prevented without obstructing visible light of an image displayed on the CRT screen.
【図１】本発明に係る電磁波漏洩防止装置の一実施形態
を示す斜視図である。FIG. 1 is a perspective view showing an embodiment of an electromagnetic wave leakage prevention device according to the present invention.
【図２】図１の電磁波漏洩防止装置を示す断面図であ
る。FIG. 2 is a sectional view showing the electromagnetic wave leakage prevention device of FIG.
１０ ＣＲＴ画面 １２ 受信アンテナ １４ 位相反転部 １６ 送信アンテナ １８ 透光性パネル ２６ 反射膜 DESCRIPTION OF SYMBOLS 10 CRT screen 12 Receiving antenna 14 Phase inversion part 16 Transmitting antenna 18 Translucent panel 26 Reflection film
Claims (2)
る受信アンテナと、この受信アンテナで受信された電磁
波の位相を反転させた位相反転信号を出力する位相反転
部と、この位相反転部から出力された位相反転信号を電
磁波として前記ＣＲＴ画面へ向けて送信する送信アンテ
ナと、前記ＣＲＴ画面に被装される透光性パネルとを備
え、 この透光性パネルに前記受信アンテナ及び前記送信アン
テナが設けられ、 この送信アンテナは、前記ＣＲＴ画面の大部分に対向す
る四角い平面状に形成された透明導電膜からなる、 電磁波漏洩防止装置。1. A receiving antenna for receiving an electromagnetic wave generated from a CRT screen, a phase inverting unit for outputting a phase inversion signal obtained by inverting the phase of the electromagnetic wave received by the receiving antenna, and an output from the phase inverting unit. A transmitting antenna for transmitting the phase-inverted signal as an electromagnetic wave toward the CRT screen, and a translucent panel mounted on the CRT screen.
For example, the receiving antenna and said transmitting Ann the translucent panel
And the transmitting antenna faces most of the CRT screen.
An electromagnetic wave leakage prevention device comprising a transparent conductive film formed in a square planar shape .
設けていない面に、当該送信アンテナから発生した電磁
波を反射させるための透明導電膜からなる反射膜が設け
られた、請求項１記載の電磁波漏洩防止装置。To 2. A surface on which the not transmit antennas provided in the translucent panel, a reflective film made of a transparent conductive film for reflecting electromagnetic waves generated from the transmission antenna is provided, according to claim 1, wherein Electromagnetic wave leakage prevention device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8147608A JP2800782B2 (en) | 1996-06-10 | 1996-06-10 | Electromagnetic wave leakage prevention device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8147608A JP2800782B2 (en) | 1996-06-10 | 1996-06-10 | Electromagnetic wave leakage prevention device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09331189A JPH09331189A (en) | 1997-12-22 |
| JP2800782B2 true JP2800782B2 (en) | 1998-09-21 |
Family
ID=15434182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8147608A Expired - Lifetime JP2800782B2 (en) | 1996-06-10 | 1996-06-10 | Electromagnetic wave leakage prevention device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2800782B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007083500A1 (en) * | 2006-01-23 | 2007-07-26 | Nippon Sheet Glass Company, Limited | Antenna-equipped image display device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000174546A (en) * | 1998-12-04 | 2000-06-23 | Yokowo Co Ltd | Device for preventing radio wave reflection by building, radio wave dark room and electric device vessel |
| US8204166B2 (en) | 2007-10-08 | 2012-06-19 | Freescale Semiconductor, Inc. | Clock circuit with clock transfer capability and method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57117300A (en) * | 1981-01-14 | 1982-07-21 | Hitachi Ltd | Leakage magnetic flux defect preventing system |
| JPH0746570B2 (en) * | 1986-03-17 | 1995-05-17 | 東レ株式会社 | Light transmission plate having electromagnetic wave shielding property |
| JPH05343883A (en) * | 1992-06-04 | 1993-12-24 | Mitsui Constr Co Ltd | Removing device for electromagnetic wave in electromagnetic shielding room |
-
1996
- 1996-06-10 JP JP8147608A patent/JP2800782B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007083500A1 (en) * | 2006-01-23 | 2007-07-26 | Nippon Sheet Glass Company, Limited | Antenna-equipped image display device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09331189A (en) | 1997-12-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4663670A (en) | Television receiver having a liquid crystal display device | |
| US6411287B1 (en) | Stress seal for acoustic wave touchscreens | |
| CA2279226A1 (en) | Three-dimensional radar apparatus and method for displaying three-dimensional radar image | |
| HUP9901396A2 (en) | Display screens incorporating loudspeakers | |
| US6724442B1 (en) | Optically switchable infrared detector | |
| EP3817343B1 (en) | Mobile terminal | |
| JPH02153598A (en) | Electromagnetically shielded room provided with reflective plate | |
| CN108232404B (en) | Electronic device | |
| EP0742448A3 (en) | Electromagnetic wave reflective type, low cost, active proximity sensor for harsh environments | |
| TWI653781B (en) | Mobile device | |
| JP2800782B2 (en) | Electromagnetic wave leakage prevention device | |
| US4280223A (en) | Radar detector | |
| JP2001298322A (en) | Radome for aircraft | |
| JPH05336043A (en) | Optical communication unit | |
| Bruning et al. | On the focusing issue of synthetic aperture radar imaging of ocean waves | |
| FR2365892A1 (en) | SQUARE OPENING CORNET ANTENNA | |
| JPH07303081A (en) | Remote control receiver | |
| US20230199094A1 (en) | Display panel and electronic device | |
| CN215070395U (en) | Electronic equipment with good antenna radiation performance | |
| JP2679643B2 (en) | Antenna device | |
| JPS6073382A (en) | Radar equipment | |
| JP4616604B2 (en) | Wireless transmission device | |
| AU2003267482A1 (en) | Electronic label antenna | |
| JPH10257148A (en) | Display device for portable telephone set | |
| JP2768135B2 (en) | Target piece |
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: 19980609 |