JPS60160791A - Cathode-ray tube - Google Patents
Cathode-ray tubeInfo
- Publication number
- JPS60160791A JPS60160791A JP1508784A JP1508784A JPS60160791A JP S60160791 A JPS60160791 A JP S60160791A JP 1508784 A JP1508784 A JP 1508784A JP 1508784 A JP1508784 A JP 1508784A JP S60160791 A JPS60160791 A JP S60160791A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- ray tube
- external magnetic
- cathode
- coil
- 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
Landscapes
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明はカラープレビジョン等の陰極線管装置に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cathode ray tube device such as a color preview device.
このような陰極線管を用いた表示装置においては、表示
品質が外部磁界の影響を受けて低下しやすい欠点を有し
ている。Display devices using such cathode ray tubes have the disadvantage that display quality tends to deteriorate due to the influence of external magnetic fields.
これを防ぐため、従来鉄板を用いた磁気シールドが行な
われているが、十分なシールド効果を得るためには相当
に厚い鉄板で陰極線管を囲う必要があシ、重量および加
工性の点で問題があった。To prevent this, conventional magnetic shielding using iron plates has been used, but in order to obtain a sufficient shielding effect, it is necessary to surround the cathode ray tube with a fairly thick iron plate, which poses problems in terms of weight and workability. was there.
本発明はこのような事情に鑑みてなされたもので、その
目的は、厚いシールド用鉄板を用いずに外部磁界の影響
を排除した陰極線管装置を提供することにある。The present invention has been made in view of the above circumstances, and its object is to provide a cathode ray tube device that eliminates the influence of external magnetic fields without using a thick iron plate for shielding.
このような目的を達成するために、本発明は、外部磁界
を検８ｊする検出器と、陰極線管周囲をＩＪＪＩうよう
に配置した電磁コイルとを備え、電磁コイルに、外部磁
界の影響を相殺する磁界を発生する電流を流すようにし
たものである。以下実施ψ１」を用いて本発明の詳細な
説明する。In order to achieve such an object, the present invention includes a detector for detecting an external magnetic field and an electromagnetic coil arranged so as to surround the cathode ray tube. It is designed to flow a current that generates a magnetic field. The present invention will be described in detail below using Example ψ1.
図は本発明の一実施例を示す構成図である。図示のよう
に、陰極線管１の周囲を囲うように、２組の電磁コイル
２および３が設けである。このうチ、コイル２は、当該
コイルで囲まれた空間にＸ方向、すなわち陰極線管１の
画面に平行で水平方向の磁界を発生するように配置し、
これに対してコイル３は、Ｙ方向、すなわち垂直方向の
磁界を発生するようにコイル２とは直角な方向に配置し
である。４は陰極線管１の周囲における上記Ｘ方向の磁
界強度および向きを検出するＸ方向磁界検出器、５は同
じ〈Ｙ方向の磁界強度および向きを検出するＸ方向磁界
検出器である。これら両検出器４および５は、電磁コイ
ル、ホール素子あるいは磁気抵抗効果ｆ子などを用いた
磁界検出器で、陰Ｖｐ線管１の周囲に配置される。The figure is a configuration diagram showing an embodiment of the present invention. As shown in the figure, two sets of electromagnetic coils 2 and 3 are provided so as to surround the cathode ray tube 1. Among these, the coil 2 is arranged so as to generate a magnetic field in the X direction, that is, in a horizontal direction parallel to the screen of the cathode ray tube 1 in the space surrounded by the coil,
On the other hand, the coil 3 is arranged in a direction perpendicular to the coil 2 so as to generate a magnetic field in the Y direction, that is, the vertical direction. Reference numeral 4 designates an X-direction magnetic field detector that detects the magnetic field strength and direction in the X direction around the cathode ray tube 1, and 5 designates an X-direction magnetic field detector that detects the magnetic field strength and direction in the Y direction. Both of these detectors 4 and 5 are magnetic field detectors using electromagnetic coils, Hall elements, magnetoresistive f-sons, etc., and are arranged around the negative Vp ray tube 1.
そこで、これら両磁界検出器４および５によシ、陰極線
管１の周囲のＸ方向およびＹ方向の外部磁界を検出し、
増幅器６および７によシ増幅した検出出力をもって、Ｘ
方向コイル２およびＹ方向コイル３に供給される電流を
制御するようにＸ方向出力回路１０およびＹ方向出力回
路１１へその検出出力が供給される。Ｘ方向ゲイン調整
回路８およびＹ方向ゲイン調整回路９は、外部磁界の不
均一等によシそわそれの磁界検出器、増幅器および出力
回路では完全に補正しきわない分を、補正回路のゲイン
を手動で調整して補償するためのものである。検出され
る外部磁界が小さいときにはゲインを小さく、コイルに
供給される電流も小さくし、外部磁界が大きいときには
ゲインを太きくして供給電流を太きくシ、その際、電流
の方向はその電流によυ発生する磁界が検出された外部
磁Ｅとは逆向きになるような方向とし、これにより夕）
部磁界の影響を相殺する。したがって、陰極線管１の偏
向勉性は外部磁界があってもその影響を実質的には受け
ることなく、はじめの設置１通りの粘性を得ることがで
きる。Therefore, both magnetic field detectors 4 and 5 detect external magnetic fields in the X direction and Y direction around the cathode ray tube 1,
With the detection output amplified by amplifiers 6 and 7,
The detection output is supplied to an X-direction output circuit 10 and a Y-direction output circuit 11 so as to control the currents supplied to the direction coil 2 and the Y-direction coil 3. The X-direction gain adjustment circuit 8 and the Y-direction gain adjustment circuit 9 adjust the gain of the correction circuit to compensate for the non-uniformity of the external magnetic field that cannot be completely corrected by the magnetic field detector, amplifier, and output circuit. This is for manual adjustment and compensation. When the detected external magnetic field is small, the gain is reduced and the current supplied to the coil is also reduced; when the external magnetic field is large, the gain is increased and the supplied current is increased. In this case, the direction of the current changes depending on the current. υ The direction is such that the generated magnetic field is opposite to the detected external magnetism E, so that
offset the effects of magnetic fields. Therefore, even if there is an external magnetic field, the deflection performance of the cathode ray tube 1 is not substantially affected, and the viscosity of the cathode ray tube 1 as originally installed can be obtained.
なお、上述した実施例ではＸ方向、Ｙ方向のそれぞれに
つｌ八て１組ずつの磁界検出器および磁界発生用のコイ
ルを用いたが、本発明はこれに限定されるものではなく
、陰極Ｍ管周囲の磁界の強度と方向とを検出できる検出
器および検出された外部磁界を相殺する磁界を発生でき
るコイルの組合せであればよく、例えば検出？：÷およ
びコイルを複数組配置することにより、陰極線管１周囲
の外部磁界の分布状態に応じてよりきめ細かな補償を行
なうことも可能である。In the above embodiment, one set of magnetic field detectors and one set of magnetic field generation coils were used in each of the X direction and the Y direction, but the present invention is not limited to this, and the cathode Any combination of a detector that can detect the strength and direction of the magnetic field around the M tube and a coil that can generate a magnetic field that cancels out the detected external magnetic field may be used. :÷By arranging a plurality of sets of coils, it is also possible to perform more detailed compensation according to the distribution state of the external magnetic field around the cathode ray tube 1.
以上説明したように、本発明によれば外部磁界を検出す
る検出器と、陰極線管周囲を囲うように配ｆＥ； した
電磁コイルとを設け、検１：Ｉ：ｌ ｌ、た外部磁界を
相殺する磁界を発生するだけの電流を上記コイルに流す
ようにしたことにより、外部磁界の存在ないしその変動
にかかわらず常に一定の良好な表示品質をイ（（ること
かできる。また、磁界検出器およびコ−ｒ ／１／なら
びにきわめて簡単な回路構成で実シＪ店でき、厚いシー
ルド用鉄板を用いる場合のような重置の増大および加工
の困雌性などの問題も生じない。As explained above, according to the present invention, a detector for detecting an external magnetic field and an electromagnetic coil arranged to surround the cathode ray tube are provided to cancel out the external magnetic field. By passing a current sufficient to generate a magnetic field through the coil, it is possible to always maintain a constant and good display quality regardless of the presence of an external magnetic field or its fluctuation. It can be put into practice with an extremely simple circuit configuration, and problems such as increased overlap and difficulty in processing that occur when using a thick iron plate for shielding do not occur.
図は本発明の一実施例を示す構成図である。
１・・・・陰′４′ｆ１．線管、２・・・・Ｘ方向磁界
発生用コイル、３・・・・Ｙ方向磁界発生用コイル、４
・・・・Ｘ方向磁界検出器、５・・・・Ｙ方向磁界検出
器、６，７・・・・増幅器、８・・・・Ｘ方向ゲイン調
整回路、９・・・・Ｙ方向ゲイン調整回路、１０・・・
・Ｘ方向出力回路、１１・・・・Ｙ方向出力回路。The figure is a configuration diagram showing an embodiment of the present invention. 1...Yin'4'f1. Wire tube, 2... Coil for generating an X-direction magnetic field, 3... Coil for generating a magnetic field in the Y-direction, 4
...X direction magnetic field detector, 5...Y direction magnetic field detector, 6,7...amplifier, 8...X direction gain adjustment circuit, 9...Y direction gain adjustment Circuit, 10...
-X direction output circuit, 11...Y direction output circuit.
Claims (1)
を囲うように配置した電磁コイルと、この電磁コイルに
電流を供給する電流源と、上記検出器の検出出力に応じ
て上記電磁コイルに供給される電１流を、当該電流によ
り電磁コイルが当該電磁コイルで囲まれた空間内に発生
する磁界が検出器により検出された外部磁界が上記空間
内に与える影響を相殺するように制御する制御回路とを
備えたことを特徴とする陰極線管装置。a detector for detecting a magnetic field around the cathode ray tube; an electromagnetic coil arranged to surround the cathode ray tube; a current source for supplying current to the electromagnetic coil; The supplied current is controlled so that the magnetic field generated by the current in the space surrounded by the electromagnetic coil cancels out the influence of the external magnetic field detected by the detector on the space. A cathode ray tube device comprising a control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1508784A JPS60160791A (en) | 1984-02-01 | 1984-02-01 | Cathode-ray tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1508784A JPS60160791A (en) | 1984-02-01 | 1984-02-01 | Cathode-ray tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60160791A true JPS60160791A (en) | 1985-08-22 |
Family
ID=11879056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1508784A Pending JPS60160791A (en) | 1984-02-01 | 1984-02-01 | Cathode-ray tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60160791A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0358133A2 (en) * | 1988-09-06 | 1990-03-14 | Thomson Consumer Electronics, Inc. | Magnetic field compensator for a CRT |
| EP0396381A2 (en) * | 1989-05-01 | 1990-11-07 | Conrac Scd, Inc. | Method and apparatus for dynamic magnetic field neutralization |
| JPH0497658A (en) * | 1990-08-15 | 1992-03-30 | Nippon Avionics Co Ltd | External magnetic field correction device for crt |
| JPH05219516A (en) * | 1992-02-07 | 1993-08-27 | Matsushita Electric Ind Co Ltd | Landing correcting device |
| JPH0698340A (en) * | 1992-09-11 | 1994-04-08 | Matsushita Electric Ind Co Ltd | Landing correction device |
| WO1996019819A1 (en) * | 1994-12-22 | 1996-06-27 | Sumitomo Metal Mining Co., Ltd. | Magnetic correction circuit and picture display using it |
-
1984
- 1984-02-01 JP JP1508784A patent/JPS60160791A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0358133A2 (en) * | 1988-09-06 | 1990-03-14 | Thomson Consumer Electronics, Inc. | Magnetic field compensator for a CRT |
| EP0396381A2 (en) * | 1989-05-01 | 1990-11-07 | Conrac Scd, Inc. | Method and apparatus for dynamic magnetic field neutralization |
| EP0396381A3 (en) * | 1989-05-01 | 1992-11-04 | Conrac Scd, Inc. | Method and apparatus for dynamic magnetic field neutralization |
| JPH0497658A (en) * | 1990-08-15 | 1992-03-30 | Nippon Avionics Co Ltd | External magnetic field correction device for crt |
| JPH05219516A (en) * | 1992-02-07 | 1993-08-27 | Matsushita Electric Ind Co Ltd | Landing correcting device |
| JPH0698340A (en) * | 1992-09-11 | 1994-04-08 | Matsushita Electric Ind Co Ltd | Landing correction device |
| WO1996019819A1 (en) * | 1994-12-22 | 1996-06-27 | Sumitomo Metal Mining Co., Ltd. | Magnetic correction circuit and picture display using it |
| GB2301515A (en) * | 1994-12-22 | 1996-12-04 | Sumitomo Metal Mining Co | Magnetic correction circuit and picture display using it |
| US5751112A (en) * | 1994-12-22 | 1998-05-12 | Sumitomo Metal Mining Co., Ltd. | CRT magnetic compensating circuit with parallel amorphous wires in the sensor |
| GB2301515B (en) * | 1994-12-22 | 1998-10-07 | Sumitomo Metal Mining Co | Magnetic compensating circuit and image display using the same |
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