JPH0516133B2 - - Google Patents
Info
- Publication number
- JPH0516133B2 JPH0516133B2 JP60203779A JP20377985A JPH0516133B2 JP H0516133 B2 JPH0516133 B2 JP H0516133B2 JP 60203779 A JP60203779 A JP 60203779A JP 20377985 A JP20377985 A JP 20377985A JP H0516133 B2 JPH0516133 B2 JP H0516133B2
- Authority
- JP
- Japan
- Prior art keywords
- coil
- magnetic field
- deflection
- unnecessary radiation
- prevention device
- 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 - Fee Related
Links
- 230000005855 radiation Effects 0.000 claims description 15
- 230000002265 prevention Effects 0.000 claims description 11
- 238000004804 winding Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 description 5
- 239000002184 metal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 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)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、CRT偏向ヨークから外部に輻射
される有害な不要信号を減衰させるようにした不
要輻射防止装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an unnecessary radiation prevention device that attenuates harmful unnecessary signals radiated to the outside from a CRT deflection yoke.
不要輻射に関し、例えば西独のVDE（Verband
Deutscher Elektrotechniker）規格で要求され
る不要輻射規制周波数は、10KHz以上となつてお
り、水平走査周波数の成分が影響し、特に偏向ヨ
ークからの漏れ磁界を抑制するために、従来は前
記のヨークを金属などで囲つて遮蔽を行つてい
た。
Regarding unnecessary radiation, for example, West Germany's VDE (Verband
The unnecessary radiation control frequency required by the Deutscher Elektrotechniker (Deutscher Elektrotechniker) standard is 10KHz or higher, and the horizontal scanning frequency component has an effect, and in order to suppress the leakage magnetic field from the deflection yoke, conventionally the yoke was made of metal. It was shielded by surrounding it with fences.
第３図は、この従来の不要輻射防止装置を示す
もので、１は偏向ヨークで、CRT２に装着され
ており、これを囲むように放熱板３および筺体４
に金属カバー５が取り付けられている。 Fig. 3 shows this conventional unnecessary radiation prevention device, in which 1 is a deflection yoke, which is attached to a CRT 2, and surrounding this is a heat sink 3 and a housing 4.
A metal cover 5 is attached to the.
次に動作について説明する。第３図ａにおい
て、水平偏向コイル１ｂに走査電流が流れると、
第３図ｂに示すように磁界が発生し、これの大部
分は、偏向ヨーク１の内部空間とコア１ａに磁力
線が分布する。しかし一部は、漏れ磁界６とし
て、外部空間に輻射する。この漏れ磁界６の外部
輻射を防ぐために、金属カバー５により、この磁
界を内部に閉じ込め、外部漏れ磁界レベルを抑制
する。 Next, the operation will be explained. In FIG. 3a, when a scanning current flows through the horizontal deflection coil 1b,
As shown in FIG. 3b, a magnetic field is generated, and most of the magnetic field lines are distributed in the inner space of the deflection yoke 1 and the core 1a. However, a part of it radiates into the external space as a leakage magnetic field 6. In order to prevent this leakage magnetic field 6 from being radiated to the outside, the metal cover 5 confines this magnetic field inside and suppresses the level of the external leakage magnetic field.
従来の不要輻射防止装置は漏れ磁界を物理的に
閉じ込めることにより外部輻射を抑制していたの
で、構造設計上に大きな制約を受け放熱、又コス
トなどに問題点があつた。
Conventional unnecessary radiation prevention devices have suppressed external radiation by physically confining leaked magnetic fields, which has resulted in major restrictions on structural design and problems with heat dissipation and cost.
この発明は上記のような問題点を解消するため
になされたもので、漏れ磁界を電気的に抑制する
ことにより、構造設計に制約を受けることもな
く、安価に構成できる不要輻射防止装置を得るこ
とを目的とする。 This invention was made to solve the above-mentioned problems, and by electrically suppressing leakage magnetic fields, it is possible to obtain an unnecessary radiation prevention device that can be constructed at low cost without being subject to restrictions on structural design. The purpose is to
この発明に係わる不要輻射防止装置は、偏向ヨ
ーク上部および下部の偏向コイルの巻回位置に対
応してその偏向ヨーク外壁面を上部および下部か
ら挟むように２分割して巻回形成され、偏向コイ
ルと直列に接続された補助コイルを設け、この上
部の補助コイルが発生する磁界および下部の補助
コイルが逆方向に発生する磁界により偏向コイル
の漏れ磁界を打消すようにしたものである。
The unnecessary radiation prevention device according to the present invention is formed by dividing the outer wall surface of the deflection yoke into two parts so as to sandwich the upper and lower parts of the deflection yoke in correspondence with the winding positions of the deflection coils in the upper and lower parts of the deflection yoke. An auxiliary coil is connected in series with the deflection coil, and the magnetic field generated by the upper auxiliary coil and the magnetic field generated in the opposite direction by the lower auxiliary coil cancel the leakage magnetic field of the deflection coil.
この発明における補助コイルは、偏向コイルと
直列あるいは並列に接続されることにより、走査
周波数に対応して、偏向コイルの漏磁界を打消す
磁界を発生する。また、偏向コイルの巻回位置に
対応して上部および下部から挟むように２分割し
て巻回形成し、相互に逆方向に磁界を発生するこ
とにより、偏向コイルの漏れ磁界を効率よく打消
し、有効磁界に対する影響も最小限におさえる。
The auxiliary coil in the present invention is connected in series or parallel with the deflection coil to generate a magnetic field corresponding to the scanning frequency that cancels the leakage field of the deflection coil. In addition, the magnetic field leakage from the deflection coil is effectively canceled by dividing the winding into two parts sandwiched from the upper and lower parts in accordance with the winding position of the deflection coil, and generating magnetic fields in opposite directions. , the effect on the effective magnetic field is also minimized.
以下、この発明の一実施例を図について説明す
る。第１図において、１０は鞍形に巻回形成され
た補助コイルで、この補助コイル１０はコア１ａ
をはさんで水平偏向コイル１ｂに対応するコア１
ａの外周壁面に取り付けられている。
An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 10 denotes an auxiliary coil wound into a saddle shape, and this auxiliary coil 10 is connected to the core 1a.
Core 1 corresponding to horizontal deflection coil 1b across
It is attached to the outer peripheral wall surface of a.
またこの補助コイル１０は第２図に示すように
水平偏向コイル１ｂに直列に接続されている。 Further, this auxiliary coil 10 is connected in series to the horizontal deflection coil 1b as shown in FIG.
このような構成において、水平偏向コイル１ｂ
およびそれに直列接続された補助コイル１０に走
査電流を流すと、水平偏向コイル１ｂは従来の場
合と同様に第３図ｂに示すような一定方向の磁界
を発生する。この磁界の有効成分はコア１ａを囲
む空間に発生され、一部の磁界が漏れ磁界として
外部空間に輻射される。これに対して、補助コイ
ル１０により発生する磁界は、水平偏向コイル１
ｂの漏れ磁界と逆方向に分布発生し、その漏れ磁
界を打ち消すよう作用する。この場合、コア１ａ
を囲む空間磁界に対してはコア１ａにより影響が
極めて少なくなつており、外部空間への不要信号
レベルとしては大幅に低減される。 In such a configuration, the horizontal deflection coil 1b
When a scanning current is passed through the auxiliary coil 10 connected in series with the horizontal deflection coil 1b, the horizontal deflection coil 1b generates a magnetic field in a fixed direction as shown in FIG. 3b, as in the conventional case. The effective component of this magnetic field is generated in the space surrounding the core 1a, and a part of the magnetic field is radiated to the external space as a leakage magnetic field. On the other hand, the magnetic field generated by the auxiliary coil 10 is
A distribution is generated in the opposite direction to the leakage magnetic field of b, and acts to cancel the leakage magnetic field. In this case, core 1a
The effect on the spatial magnetic field surrounding the core 1a is extremely reduced, and the level of unnecessary signals to the outside space is significantly reduced.
以上のようにこの発明によれば、偏向ヨーク上
部および下部の偏向コイルの巻回位置に対応して
その偏向ヨーク外壁面を上部および下部から挟む
ように２分割して巻回形成され、偏向コイルと直
列に接続された補助コイルを設け、この上部の補
助コイルが発生する磁界および下部の補助コイル
が逆方向に発生する磁界により偏向コイルの漏れ
磁界を打消すように構成したので、偏向コイルと
接続されることにより、走査周波数に対応した偏
向コイルの漏磁界を打消す磁界を発生させること
ができ、走査周波数が高くなつても電気性能を損
なうことはない。また、偏向コイルの巻回位置に
対応して上部および下部から挟むように２分割し
て巻回形成し、相互に逆方向に磁界を発生するこ
とにより、偏向コイルの漏れ磁界を効率よく打消
すことができ、有効磁界に対する影響も最小限に
おさえることができ、従来のように、遮蔽カバー
等も必要とせず、安価に構成できる効果がある。
As described above, according to the present invention, the outer wall surface of the deflection yoke is divided into two parts and wound in such a way that the outer wall surface of the deflection yoke is sandwiched between the upper and lower parts of the deflection yoke, corresponding to the winding positions of the deflection coils on the upper and lower parts of the deflection yoke. An auxiliary coil is connected in series with the deflection coil, and the magnetic field generated by the upper auxiliary coil and the magnetic field generated by the lower auxiliary coil in the opposite direction cancel out the leakage magnetic field of the deflection coil. By being connected, it is possible to generate a magnetic field that cancels the leakage field of the deflection coil corresponding to the scanning frequency, and electrical performance is not impaired even if the scanning frequency becomes high. In addition, the leakage magnetic field of the deflection coil can be effectively canceled by dividing the winding into two parts, sandwiching them from the upper and lower parts in accordance with the winding position of the deflection coil, and generating magnetic fields in opposite directions. The effect on the effective magnetic field can be kept to a minimum, and there is no need for a shielding cover or the like as in the conventional case, resulting in an inexpensive construction.
第１図は、この発明の一実施例における不要輻
射防止装置の構成を示す図、第２図は、第１図の
電気的接続を示す回路図、第３図ａ〜ｃは、従来
の不要輻射防止装置を示す図で、第３図ａは従来
の構成を、第３図ｂは磁力線の分布を、第３図ｃ
は偏向ヨークの側面をそれぞれ示す図である。
図において、１は偏向ヨーク、１ａはコア、１
ｂは水平偏向コイル、１０は補助コイルである。
なお、図中同一符号は同一又は相当部分を示す。
Fig. 1 is a diagram showing the configuration of an unnecessary radiation prevention device according to an embodiment of the present invention, Fig. 2 is a circuit diagram showing the electrical connection of Fig. 1, and Figs. Figure 3a shows the conventional configuration, Figure 3b shows the distribution of magnetic lines of force, and Figure 3c shows the radiation prevention device.
2A and 2B are views showing side surfaces of the deflection yoke, respectively. In the figure, 1 is a deflection yoke, 1a is a core, 1
b is a horizontal deflection coil, and 10 is an auxiliary coil.
Note that the same reference numerals in the figures indicate the same or equivalent parts.
Claims (1)
漏れ磁界による不要輻射を防止する不要輻射防止
装置において、上記偏向ヨーク上部および下部の
偏向コイルの巻回位置に対応してその偏向ヨーク
外壁面を上部および下部から挟むように２分割し
て巻回形成され、上記偏向コイルと直列あるいは
並列に接続された補助コイルを設け、この上部の
補助コイルが発生する磁界および下部の補助コイ
ルが逆方向に発生する磁界により上記偏向コイル
の漏れ磁界を打消すようにしたことを特徴とする
不要輻射防止装置。 ２ 偏向コイルは水平偏向コイルであることを特
徴とする特許請求の範囲第１項記載の不要輻射防
止装置。 ３ 補助コイルは鞍型に巻回形成されたことを特
徴とする特許請求の範囲第１項または第２項記載
の不要輻射防止装置。[Scope of Claims] 1. In an unnecessary radiation prevention device that prevents unnecessary radiation due to leakage magnetic fields of a deflection coil wound around a CRT deflection yoke, the An auxiliary coil is provided, which is formed by winding the outer wall of the deflection yoke by dividing it into two parts sandwiching the upper and lower parts of the deflection yoke, and is connected in series or parallel with the above deflection coil, and the magnetic field generated by the upper auxiliary coil and the lower auxiliary coil An unnecessary radiation prevention device characterized in that the leakage magnetic field of the deflection coil is canceled by a magnetic field generated by the coil in the opposite direction. 2. The unnecessary radiation prevention device according to claim 1, wherein the deflection coil is a horizontal deflection coil. 3. The unnecessary radiation prevention device according to claim 1 or 2, wherein the auxiliary coil is wound in a saddle shape.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60203779A JPS6264024A (en) | 1985-09-13 | 1985-09-13 | Unnecessary radiation preventer |
| KR1019860004501A KR900001503B1 (en) | 1985-09-13 | 1986-06-05 | Radiation suppression device |
| US06/903,974 US4709220A (en) | 1985-09-13 | 1986-09-04 | Radiation suppression device |
| DE19863631023 DE3631023A1 (en) | 1985-09-13 | 1986-09-09 | DEVICE FOR SUPPRESSING UNWANTED RADIATION THROUGH A MAGNETIC STRANDING FIELD |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60203779A JPS6264024A (en) | 1985-09-13 | 1985-09-13 | Unnecessary radiation preventer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6264024A JPS6264024A (en) | 1987-03-20 |
| JPH0516133B2 true JPH0516133B2 (en) | 1993-03-03 |
Family
ID=16479637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60203779A Granted JPS6264024A (en) | 1985-09-13 | 1985-09-13 | Unnecessary radiation preventer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6264024A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0622103B2 (en) * | 1986-07-18 | 1994-03-23 | 株式会社村田製作所 | Deflection-yoke device |
| JPH027334A (en) * | 1988-06-24 | 1990-01-11 | Victor Co Of Japan Ltd | Leakage flux reduction device |
| US5350973A (en) * | 1989-08-31 | 1994-09-27 | Kabushiki Kaisha Toshiba | Cathode-ray tube apparatus having a reduced leak of magnetic fluxes |
| JPH05290759A (en) * | 1992-04-09 | 1993-11-05 | Toshiba Corp | Cathode-ray tube device |
| KR100274275B1 (en) * | 1995-12-07 | 2001-01-15 | 가나이 쓰도무 | Cathode ray tube display |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59197198A (en) * | 1983-04-22 | 1984-11-08 | 株式会社トーキン | Magnetic shielding device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6017984Y2 (en) * | 1978-12-21 | 1985-05-31 | 松下電器産業株式会社 | Deflection yoke shield cylinder mounting device |
-
1985
- 1985-09-13 JP JP60203779A patent/JPS6264024A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59197198A (en) * | 1983-04-22 | 1984-11-08 | 株式会社トーキン | Magnetic shielding device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6264024A (en) | 1987-03-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |