JPH027334A - Leakage flux reduction device - Google Patents
Leakage flux reduction deviceInfo
- Publication number
- JPH027334A JPH027334A JP15641188A JP15641188A JPH027334A JP H027334 A JPH027334 A JP H027334A JP 15641188 A JP15641188 A JP 15641188A JP 15641188 A JP15641188 A JP 15641188A JP H027334 A JPH027334 A JP H027334A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic flux
- display surface
- deflection coil
- leakage
- electric wire
- 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.)
- Pending
Links
- 230000004907 flux Effects 0.000 title claims abstract description 58
- 238000010894 electron beam technology Methods 0.000 claims abstract description 8
- 230000002411 adverse Effects 0.000 abstract 1
- 239000002184 metal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/003—Arrangements for eliminating unwanted electromagnetic effects, e.g. demagnetisation arrangements, shielding coils
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/0007—Elimination of unwanted or stray electromagnetic effects
- H01J2229/0015—Preventing or cancelling fields leaving the enclosure
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Electrodes For Cathode-Ray Tubes (AREA)
- Details Of Television Scanning (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は漏れ磁束軽減装置に係り、特にＣＲ−ｒ（陰極
線管）方式の表示装置の偏向コイルにより発生する漏れ
磁束を軽減する漏れ磁束軽減装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a leakage flux reducing device, and more particularly to a leakage flux reducing device for reducing leakage flux generated by a deflection coil of a CR-r (cathode ray tube) type display device. .
従来の技術
ＣＲＴ （Ｃａｔｈｏｄ Ｒａｙ Ｔｕｂｅ ：陰極線
管）を使用したデイスプレィ等の表示装置は電子ビーム
を偏向させる方法として偏向コイル等により発生する磁
界を利用している。2. Description of the Related Art Display devices such as displays using a conventional CRT (Cathode Ray Tube) utilize a magnetic field generated by a deflection coil or the like as a method of deflecting an electron beam.
このため、ＣＲＴを使用した表示装置では偏向コイル等
により発生する磁束が装置より漏れ出て他の機器の妨害
にならないように金属板で装置を覆っていた。Therefore, in a display device using a CRT, the device is covered with a metal plate to prevent magnetic flux generated by a deflection coil or the like from leaking out of the device and interfering with other devices.
発明が解決しようとする課題
しかるに、従来の漏れ磁束軽減装置では金属板によって
のみ漏れ磁束を遮蔽しようとしていたため、ＴＶ、デイ
スプレィ等の表示装置は表示装置である以上、その表示
面までも金属板で覆う訳にはいかず、表示面からは磁束
が漏れてしまうという問題点がａ５−）た。Problems to be Solved by the Invention However, in conventional leakage flux reducing devices, leakage flux was shielded only by metal plates, so since display devices such as TVs and displays are display devices, even their display surfaces are covered with metal plates. There was a problem that the magnetic flux leaked from the display surface because it could not be covered with a.
本発明は上記の点に鑑みてなされたもので表示面に何の
障害物も設けずに表示面への磁束の漏れを軽減する漏れ
磁束軽減装置を提供することを目的とする。The present invention has been made in view of the above points, and an object of the present invention is to provide a magnetic flux leakage reducing device that reduces leakage of magnetic flux to a display surface without providing any obstacles on the display surface.
課題を解決するための手段
本発明は電子ビームを偏向コイルにより偏向して螢光表
示面に当て螢光表示面を発光させて表示を行なう表示装
置において、
前記螢光表示面の周囲に電線を配δしてなる。Means for Solving the Problems The present invention provides a display device in which an electron beam is deflected by a deflection coil and applied to a fluorescent display surface to cause the fluorescent display surface to emit light, in which an electric wire is provided around the fluorescent display surface. It is arranged by δ.
作用
電子ビームを偏向するときに偏向コイルに磁束が発生す
る。偏向コイルの磁束の一部は螢光表示面より漏れ出る
。A magnetic flux is generated in the deflection coil when deflecting the working electron beam. A portion of the magnetic flux of the deflection coil leaks out from the fluorescent display surface.
螢光表示面の周囲に配置した電線には、螢光表示面より
漏れ出る磁束の向きとは逆向きの磁束が発生するよう電
流が供給される。この電流で電線に発生する磁束により
螢光表示面から漏れ出る磁束がキャンセルされる。A current is supplied to the electric wires arranged around the fluorescent display surface so as to generate magnetic flux in the opposite direction to the direction of the magnetic flux leaking from the fluorescent display surface. The magnetic flux generated in the electric wire by this current cancels the magnetic flux leaking from the fluorescent display surface.
実施例
第１図は本発明の一実施例の斜視図を示す。１はＣＴＲ
，２は偏向コイル、３ａ、３ｂは本発明の要部であるキ
ャンセル磁束発生用電線を示す。Embodiment FIG. 1 shows a perspective view of an embodiment of the present invention. 1 is CTR
, 2 are deflection coils, and 3a and 3b are canceling magnetic flux generating electric wires which are essential parts of the present invention.
水平偏向コイルは電子ビームを横方向に撮るため、磁束
を電子ビームの走査方向と直交する縦方向に発生させる
。このため、電子銃４の上下に水平偏向コイルを設けて
いる。したがって、水平偏向コイルにより発生する漏れ
磁束は例えば第２図。Since the horizontal deflection coil captures the electron beam in the horizontal direction, it generates magnetic flux in the vertical direction orthogonal to the scanning direction of the electron beam. For this reason, horizontal deflection coils are provided above and below the electron gun 4. Therefore, the leakage magnetic flux generated by the horizontal deflection coil is as shown in FIG. 2, for example.
第３図に示すような向きに発生することになる。This will occur in the direction shown in FIG.
第２図、第３図は水平偏向コイルにより発生する閲れ磁
束の向ぎを示したもので、この水平偏向コイルには比較
的周波数の高い信号が供給されるため、水平偏向コイル
により発生する磁界のｍ器からの漏れ磁束は他のＩＮ器
の妨害となりやすく、とくに規制が厳しい。そこで、本
実施例では水平偏向コイルにより発生する漏れ磁束を軽
減するように装δを構成する。Figures 2 and 3 show the direction of the magnetic flux generated by the horizontal deflection coil.Since a relatively high frequency signal is supplied to this horizontal deflection coil, the magnetic flux generated by the horizontal deflection coil is The magnetic flux leaking from the magnetic field unit easily interferes with other IN units, and regulations are particularly strict. Therefore, in this embodiment, the device δ is configured to reduce the leakage magnetic flux generated by the horizontal deflection coil.
電線３ａは表示面５の周囲の上半分を巻回するように配
置され、電ａ３ｂは下半分を巻回するように配回され、
水平偏向電流が例えば第１図に矢印で示す方向に供給さ
れる。The electric wire 3a is arranged so as to wind around the upper half of the periphery of the display surface 5, and the electric wire a3b is arranged so as to wind around the lower half,
A horizontal deflection current is supplied, for example, in the direction indicated by the arrow in FIG.
また、偏向コイル２は電子銃４の近傍に設けられ、電子
ビームを偏向する。偏向コイル２には偏向回路より水平
偏向電流が供給される。このとき、偏向回路からの信号
は偏向コイル２に供給されると共に、磁束発生用電線３
ａ、３′ｂにも供給され、偏向コイル２と同期して動作
する。Further, the deflection coil 2 is provided near the electron gun 4 and deflects the electron beam. A horizontal deflection current is supplied to the deflection coil 2 from a deflection circuit. At this time, the signal from the deflection circuit is supplied to the deflection coil 2, and the magnetic flux generating electric wire 3
a and 3'b, and operates in synchronization with the deflection coil 2.
第２図は水平偏向コイル及び４−センセル磁束発生用電
線により生ずる磁束のＣＲＴの上半分の新面図であり、
実線が電１３ａにより発生する磁束で、破線が偏向コイ
ル２により発生する磁束を示す。第２図に示すように偏
向コイル２で生じた磁束がＴｒ １ｍ ３ ａによりキ
ャンセルされる。これは下半分でも同様に表示面からの
漏れ磁束は減少する。Fig. 2 is a new view of the upper half of the CRT of the magnetic flux generated by the horizontal deflection coil and the 4-sensor magnetic flux generating wire;
The solid line shows the magnetic flux generated by the electric current 13a, and the broken line shows the magnetic flux generated by the deflection coil 2. As shown in FIG. 2, the magnetic flux generated in the deflection coil 2 is canceled by Tr 1m 3 a. Similarly, the leakage magnetic flux from the display surface is reduced in the lower half as well.
第３図は水平偏向コイル及びキャンセル磁束発生用電線
に生ずる磁束のＣＲＴの側断面図であり、第２図と同様
実線矢印が電線３ａ、３ｂにより発生する磁束であり、
破線矢印が偏向コイル２により発生する磁束である。第
３図に示すように偏向コイル２て生じた磁束が電線３ａ
、３ｂｋ：より発生した磁束によりキャンセルされる。FIG. 3 is a side sectional view of the CRT of the magnetic flux generated in the horizontal deflection coil and the canceling magnetic flux generating electric wire, and as in FIG. 2, the solid arrows indicate the magnetic flux generated by the electric wires 3a and 3b.
The broken arrow indicates the magnetic flux generated by the deflection coil 2. As shown in FIG. 3, the magnetic flux generated by the deflection coil 2
, 3bk: Cancelled by the magnetic flux generated.
なお、偏向コイルからの漏れ磁界はＩｌ器の形状。Note that the leakage magnetic field from the deflection coil has the shape of a coil.
偏向電流の強さで変わるが表示面５の周囲に配置する電
線の本数を増減することにより、漏れ磁束とのバランス
を取ることが可能である。Although it varies depending on the strength of the deflection current, it is possible to balance the leakage magnetic flux by increasing or decreasing the number of electric wires arranged around the display surface 5.
なお、参考までに本実施例の表示装置と表示面からの磁
束漏れ対策を施していない表示装置の表示面からの漏れ
磁束を測定した測定結果を表１に示す。なお、測定法は
ＶＤＥＯ８７１規格に基づ＜３ｍ法で行っている。For reference, Table 1 shows the measurement results of the magnetic flux leakage from the display surface of the display device of this example and a display device without measures against magnetic flux leakage from the display surface. The measurement method is <3m method based on the VDEO871 standard.
表 １
表１に示すように本発明による一実施例の表示装置は漏
れ磁束に対する対策を施していない表示装置に比し明ら
かに漏れ磁束が少ないことがわかる。Table 1 As shown in Table 1, it can be seen that the display device according to one embodiment of the present invention has clearly less leakage magnetic flux than a display device that does not take measures against leakage magnetic flux.
発明の効果
上述の如く、本発明によれば、表示面の周囲に電線を配
置し、その電線に電流を流し、磁束を発生させ、偏向コ
イルにより生じる漏れ磁束をキャンセルすることができ
るため、ＣＲＴの前面に何の陣古物も置くことなく Ｃ
Ｒ−ｒ表示面からの漏れ磁束を減少することができ、他
の機器への妨害を減少することができる等の特長を有す
る。Effects of the Invention As described above, according to the present invention, electric wires are arranged around the display screen, current is passed through the electric wires, magnetic flux is generated, and leakage magnetic flux generated by the deflection coil can be canceled. C without placing any artifacts in front of C.
It has features such as being able to reduce leakage magnetic flux from the R-r display surface and reducing interference with other equipment.
第１図は本発明の一実施例の斜視図、第２図は本発明の
一実施例の上部断面図、第３図は本発明の一実施例の側
面断面図である。
１・・・ＣＲＴ、２・・・偏向コイル、３ａ、３ｂ・・
・電線、５・・・表示面。
特許出願人 日本ビクター株式会社
嬉２図
属国
第３図FIG. 1 is a perspective view of one embodiment of the present invention, FIG. 2 is a top sectional view of one embodiment of the present invention, and FIG. 3 is a side sectional view of one embodiment of the present invention. 1...CRT, 2...Deflection coil, 3a, 3b...
・Electric wire, 5...display surface. Patent applicant: Japan Victor Co., Ltd. Figure 2 Dependent country Figure 3
Claims (1)
て、該螢光表示面を発光させて表示を行なう表示装置の
漏れ磁束軽減装置において、前記螢光表示面の周囲に電
線を配置し、前記偏向コイルより漏れ出る磁束の向きと
は逆向きの磁束が前記電線の周囲に発生するように前記
電線に電流を供給することを特徴とする漏れ磁束軽減装
置。In a leakage magnetic flux reduction device for a display device in which an electron beam is deflected by a deflection coil and applied to a fluorescent display surface to cause the fluorescent display surface to emit light and display, an electric wire is arranged around the fluorescent display surface, A leakage flux reducing device characterized in that a current is supplied to the electric wire so that magnetic flux in a direction opposite to the direction of the magnetic flux leaking from the deflection coil is generated around the electric wire.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15641188A JPH027334A (en) | 1988-06-24 | 1988-06-24 | Leakage flux reduction device |
| DE1989624500 DE68924500T2 (en) | 1988-06-24 | 1989-06-23 | Device for eliminating stray magnetic fields in image display devices. |
| EP19890306338 EP0348205B1 (en) | 1988-06-24 | 1989-06-23 | Device for suppression of leakage of magnetic flux in display apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15641188A JPH027334A (en) | 1988-06-24 | 1988-06-24 | Leakage flux reduction device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH027334A true JPH027334A (en) | 1990-01-11 |
Family
ID=15627160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15641188A Pending JPH027334A (en) | 1988-06-24 | 1988-06-24 | Leakage flux reduction device |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0348205B1 (en) |
| JP (1) | JPH027334A (en) |
| DE (1) | DE68924500T2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5200673A (en) * | 1988-10-31 | 1993-04-06 | Victor Company Of Japan, Ltd. | Method and device for suppression of leakage of magnetic flux in display apparatus |
| US5027819A (en) * | 1990-07-12 | 1991-07-02 | Biomagnetic Technologies, Inc. | Measurement of visually induced biomagnetic responses |
| JPH05244540A (en) * | 1991-12-14 | 1993-09-21 | Sony Corp | Monitor device |
| US5959392A (en) * | 1995-01-24 | 1999-09-28 | International Business Machines Corporation | Cancellation coil arrangement for reducing stray magnetic field emissions from CRT displays |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5166726A (en) * | 1974-12-06 | 1976-06-09 | Tokyo Electric Power Co | TEREBIEIZOHIZUMIBOSHISOCHI |
| JPS5574046A (en) * | 1978-11-30 | 1980-06-04 | Toshiba Corp | Deflecting device for cathode-ray tube |
| JPS6264024A (en) * | 1985-09-13 | 1987-03-20 | Mitsubishi Electric Corp | Unnecessary radiation preventer |
| JPH01157035A (en) * | 1987-12-11 | 1989-06-20 | Mitsubishi Electric Corp | Color cathode-ray tube |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE452077C (en) * | 1986-03-04 | 1992-12-07 | Blixt Autovision | DEVICE TO REDUCE UNWANTED LEAKFIELD ACTIVITIES IN FRONT OF CATHEDRAL TUBE SCREEN |
-
1988
- 1988-06-24 JP JP15641188A patent/JPH027334A/en active Pending
-
1989
- 1989-06-23 DE DE1989624500 patent/DE68924500T2/en not_active Expired - Fee Related
- 1989-06-23 EP EP19890306338 patent/EP0348205B1/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5166726A (en) * | 1974-12-06 | 1976-06-09 | Tokyo Electric Power Co | TEREBIEIZOHIZUMIBOSHISOCHI |
| JPS5574046A (en) * | 1978-11-30 | 1980-06-04 | Toshiba Corp | Deflecting device for cathode-ray tube |
| JPS6264024A (en) * | 1985-09-13 | 1987-03-20 | Mitsubishi Electric Corp | Unnecessary radiation preventer |
| JPH01157035A (en) * | 1987-12-11 | 1989-06-20 | Mitsubishi Electric Corp | Color cathode-ray tube |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0348205B1 (en) | 1995-10-11 |
| DE68924500T2 (en) | 1996-03-21 |
| DE68924500D1 (en) | 1995-11-16 |
| EP0348205A3 (en) | 1990-06-13 |
| EP0348205A2 (en) | 1989-12-27 |
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