JPH079785B2 - Deflection device for flat cathode ray tubes - Google Patents
Deflection device for flat cathode ray tubesInfo
- Publication number
- JPH079785B2 JPH079785B2 JP59142249A JP14224984A JPH079785B2 JP H079785 B2 JPH079785 B2 JP H079785B2 JP 59142249 A JP59142249 A JP 59142249A JP 14224984 A JP14224984 A JP 14224984A JP H079785 B2 JPH079785 B2 JP H079785B2
- Authority
- JP
- Japan
- Prior art keywords
- deflection
- cathode ray
- ray tube
- flat cathode
- electron beam
- 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
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
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/70—Arrangements for deflecting ray or beam
- H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
- H01J29/76—Deflecting by magnetic fields only
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は電子銃の軸が蛍光膜面を横切らないように設
定されている偏平形ブラウン管の偏向装置に関するもの
である。TECHNICAL FIELD The present invention relates to a deflecting device for a flat cathode ray tube in which the axis of an electron gun is set so as not to cross the fluorescent film surface.
［背景技術とその問題点］ 電子銃から放出された電子ビームを蛍光膜面に向け、こ
れを偏向してラスタを形成する通常のブラウン管は、画
像面からの奥行きが長くなるため、小型のTV受像機を製
作する上で大きな障害となっている。[Background Art and its Problems] An ordinary cathode-ray tube that directs an electron beam emitted from an electron gun to a fluorescent film surface and deflects the electron beam to form a raster has a long depth from the image surface, and thus a small TV. This is a major obstacle to the production of receivers.
そこで、電子銃から放出された電子ビームを途中でほぼ
90゜偏向し、蛍光膜面に照射する偏平形のブラウン管が
開発されている。Therefore, the electron beam emitted from the electron gun was almost
A flat cathode ray tube has been developed that deflects 90 ° and irradiates the fluorescent film surface.
第１図（ａ）（ｂ）はかかる偏平形のブラウン管の側面
および平面を示す図で、１はネック部、２はフアンネル
部、３は表示部を示している。FIGS. 1 (a) and 1 (b) are views showing a side surface and a plane of such a flat cathode ray tube, wherein 1 is a neck portion, 2 is a funnel portion, and 3 is a display portion.
表示部３の内壁には電子ビームが衝突したときに発光す
る蛍光膜４が塗布され、その上面には透明な透視部５が
形成されている。A fluorescent film 4 that emits light when an electron beam collides is applied to the inner wall of the display unit 3, and a transparent see-through unit 5 is formed on the upper surface thereof.
６は電子ビームを水平および垂直方向に偏向するための
偏向装置を示し、従来のCRTと同様に水平偏向コイル及
び垂直偏向コイルからなる偏向コイル6a、フライトコア
6b等によって形成されている。Denoted at 6 is a deflecting device for deflecting the electron beam in the horizontal and vertical directions. Like the conventional CRT, the deflection coil 6a is composed of a horizontal deflection coil and a vertical deflection coil, and a flight core.
It is formed of 6b and the like.
このような偏平形のブラウン管ではネック部１に配置さ
れている電子銃（図示せず）から放出された電子ビーム
は一点鎖線で示すように直進し、この軸（以下、電子銃
の軸という）は蛍光膜４を横切ることはないが、偏向装
置６の偏向コイルに直流成分を含む垂直偏向電流、及び
水平偏向電流を流すと、偏向中心（Ｐ）より実線で示す
ように電子ビームが曲げられ蛍光膜４上に衝突してラス
タが形成される。In such a flat cathode ray tube, an electron beam emitted from an electron gun (not shown) arranged in the neck portion 1 goes straight as shown by a chain line, and its axis (hereinafter referred to as the electron gun axis) Does not cross the fluorescent film 4, but when a vertical deflection current and a horizontal deflection current containing a DC component are passed through the deflection coil of the deflection device 6, the electron beam is bent from the deflection center (P) as shown by the solid line. A collision is formed on the fluorescent film 4 to form a raster.
この場合に蛍光膜４上に形成されるラスタは、通常の鋸
歯状波で偏向した場合は、第２図に示すように扇形のラ
スタとなる。In this case, the raster formed on the fluorescent film 4 becomes a fan-shaped raster as shown in FIG. 2 when deflected by a normal sawtooth wave.
これは電子ビームが蛍光膜４に衝突するまでの距離がラ
スタの各辺で異なることが大きな原因となっているの
で、何らかの補正をする必要がある。This is largely due to the fact that the distance until the electron beam strikes the fluorescent film 4 is different on each side of the raster, so some correction is necessary.
ところでラスタ歪みのうち左右が不平行になる歪みは、
偏向回路側で比較的容易に補正することができるが、上
下のピン歪み（Top Bottom Pin Cution）は、電子ビ
ームの照射距離が特に上下方向で大きく異なるため、偏
平形のブラウン管では著しく非対象となる。By the way, among the raster distortions,
It can be corrected relatively easily on the deflection circuit side, but the top-bottom pin-cutting (Top Bottom Pin Cution) is markedly asymmetric in flat cathode ray tubes because the irradiation distance of the electron beam differs greatly in the vertical direction. Become.
この上下の非対象なピン歪みを偏向回路側で全部補正し
ようとすると、消費電力が増大し、補正電流を形成する
回路構成が複雑になり、小型のTV受像機を形成する場合
に大きな障害となっている。そこで、本出願人が先に提
案した発明（特開昭57−50750号公報）に見られるよう
に、水平及び垂直偏向コイルをアンバランスな形に構成
し、この水平及び垂直偏向コイルによって形成される扇
形の歪磁界分布で補正することが考えられるが、偏向磁
界を大きく歪ませるとビームスポットも歪み画質に悪い
影響を与えることになる。Attempting to correct all of these asymmetrical pin distortions on the upper and lower sides on the deflection circuit side increases power consumption and complicates the circuit configuration for forming the correction current, resulting in a major obstacle in forming a small TV receiver. Has become. Therefore, as seen in the invention (Japanese Patent Application Laid-Open No. 57-50750) previously proposed by the applicant, the horizontal and vertical deflection coils are formed in an unbalanced form and are formed by the horizontal and vertical deflection coils. It may be possible to correct with a fan-shaped distorted magnetic field distribution, but if the deflection magnetic field is greatly distorted, the beam spot will also have a distorted effect on the image quality.
特に、補正磁界を上下ピン歪みに対して修正するように
与えることが困難であり、また大きな補正磁界を与える
と電子ビームのスポットにも歪みが発生し画質を劣化す
るという問題がある。In particular, it is difficult to apply the correction magnetic field so as to correct the vertical pin distortion, and when a large correction magnetic field is applied, the electron beam spot is also distorted and the image quality is deteriorated.
［発明の概要と作用］ この発明は、電子ビームが蛍光膜面を横切らないように
なされた偏平形のブラウン管に対して、偏向ヨークの中
心軸が前記蛍光膜面のほぼ中心部に向くように偏向装置
そのものを配置するものである。[Outline and Action of the Invention] The present invention is directed to a flat type cathode ray tube in which an electron beam does not traverse the fluorescent film surface, so that the central axis of the deflection yoke is directed to substantially the central portion of the fluorescent film surface. The deflecting device itself is arranged.
このような配置にすると、電子ビームを垂直方向に走査
するときに、ラスタの中心部に向かう電子ビームが垂直
偏向磁界のほぼ中央部を通過し、この位置から上下方向
に偏向するように構成することができるようになり、ラ
スタの上側及び下側で発生するピン歪みを従来の偏平型
のブラウン管に比較して小さい歪磁界によって補正する
ことができる。With this arrangement, when scanning the electron beam in the vertical direction, the electron beam heading for the central portion of the raster passes through substantially the central portion of the vertical deflection magnetic field and is deflected vertically from this position. It becomes possible to correct the pin distortion generated on the upper side and the lower side of the raster with a small distortion magnetic field as compared with the conventional flat cathode ray tube.
その結果、従来の偏平形のブラウン管の補正電流に比較
して、僅かな補正電流によって上下のピン歪みを解消す
ることができる。As a result, it is possible to eliminate the upper and lower pin distortions with a slight correction current as compared with the correction current of the conventional flat cathode ray tube.
［実施例］ 第３図は本発明の一実施例を示す偏平形のブラウン管の
偏向装置を示しもので、第１図（ａ）と同一部分は同一
の符号で示されている。[Embodiment] FIG. 3 shows a flat type cathode ray tube deflecting device according to an embodiment of the present invention. The same parts as those in FIG. 1 (a) are designated by the same reference numerals.
本発明の偏向装置７は図示されているように偏向ヨーク
中心軸が２点鎖線で示すように電子銃の軸と角度θで交
わるように取り付けた点に特徴を有する。The deflecting device 7 of the present invention is characterized in that it is mounted so that the central axis of the deflecting yoke intersects with the axis of the electron gun at an angle θ as shown by a two-dot chain line.
また、この実施例では上下の偏向コイル7a、7aとフエラ
イトコア7bのフアンネル部２に対するテーパは従来のも
のより大きくなるように設定している。Further, in this embodiment, the taper of the upper and lower deflection coils 7a, 7a and the ferrite core 7b with respect to the funnel portion 2 is set to be larger than that of the conventional one.
このように偏向装置７を電子銃の軸に対して傾けて取り
付け、この偏向装置の垂直偏向コイルに例えば所定の直
流電流を流しておくと、電子ビームは第３図に示されて
いるように偏向装置７の偏向中心部で偏向され、ラスタ
の中央部に向かう電子ビームは垂直偏向磁界のほぼ中心
部を通過することになる。As described above, when the deflecting device 7 is attached to be tilted with respect to the axis of the electron gun and a predetermined direct current is applied to the vertical deflecting coil of the deflecting device, the electron beam becomes as shown in FIG. The electron beam deflected at the deflection center portion of the deflecting device 7 and traveling toward the center portion of the raster passes through substantially the center portion of the vertical deflection magnetic field.
水平偏向コイルによる偏向磁界は、例えば第４図に示す
ように、中心部の磁束密度が高くなるように設定する
が、上下左右でほぼ対象となるように歪ませればよく、
このような偏向磁界は一般的な偏向装置によって作るこ
とができる。（完全な平行磁界とする方が困難である） また上側及び下側で異なる距離の補正を行うために、さ
らにTV受像機で行われているようなピン歪み補正や台形
歪み補正用の補正電流を垂直偏向電流に重畳し、垂直偏
向コイルに流すことによって、低電力で上下の非対象な
ピン歪みや、台形歪みを容易に解消することができる。The deflection magnetic field by the horizontal deflection coil is set so that the magnetic flux density in the central portion is high, as shown in FIG. 4, for example, but it may be distorted so that it is substantially symmetrical in the vertical and horizontal directions.
Such a deflection magnetic field can be produced by a general deflection device. (It is more difficult to make a perfect parallel magnetic field.) In addition, in order to correct different distances on the upper side and the lower side, correction current for pin distortion correction and trapezoidal distortion correction, which is also used in TV receivers. Is superimposed on the vertical deflection current and passed through the vertical deflection coil, it is possible to easily eliminate asymmetrical pin distortions and trapezoidal distortions with low power.
第５図は偏向ヨークの中心軸を変えるための他の実施例
を示す。この場合は偏向形のブラウン管のフアンネル部
２の傾きが非対象になるように設定したものである。し
たがって、第３図の実施例と比較して、少なくともネッ
ク部１の下側では偏向コイル7aとフアンネル部２の間
隙、すなわち第３図のQ1部分の間隙がなくなり偏向能率
が向上する。FIG. 5 shows another embodiment for changing the central axis of the deflection yoke. In this case, the inclination of the funnel portion 2 of the deflection type cathode ray tube is set so as to be asymmetric. Therefore, compared with the embodiment of FIG. 3, the gap between the deflection coil 7a and the funnel portion 2, that is, the gap of the Q 1 portion in FIG. 3 is eliminated at least under the neck portion 1, and the deflection efficiency is improved.
第６図はこの発明のさらに他の実施例を示したもので、
フエライトコア7bの内面をストレートな形状にしもので
ある。FIG. 6 shows still another embodiment of the present invention.
The ferrite core 7b has a straight inner surface.
この場合は、ネック部１の上側と偏向コイル7aの間隙
（第３図のQ2の部分）もなくなり、第５図と同様に偏向
能率が改善される。In this case, the gap of the upper and the deflection coil 7a of the neck portion 1 (Q 2 portions of FIG. 3) is also eliminated, as well as the deflection efficiency and Figure 5 is improved.
第５図の実施例ではネック部１と上側の偏向コイル7aの
間に間隙Q3が生じている。すなわち、Ａ−Ａ′線の断面
を示すと、第７図に示すようにネック部１の円S1に対し
て、偏向装置７の内径は円S2に示すように上側で間隙Q3
が生じ、偏向能率が低下する。そこでこの間隙Q3の部分
をできるだけ小さくするために、第８図に示すように偏
向コイル7aの内径を縦長の楕円S3とすることが好まし
い。In the embodiment shown in FIG. 5, a gap Q 3 is formed between the neck portion 1 and the upper deflection coil 7a. That, A-A 'when showing a section of the line, with respect to the circle S 1 of the neck portion 1 as shown in FIG. 7, the gap Q 3 the inner diameter of the deflection apparatus 7 in the upper as shown in the circle S 2
Occurs, and the deflection efficiency decreases. Therefore, in order to make the gap Q 3 as small as possible, it is preferable to make the inner diameter of the deflection coil 7a an elongated ellipse S 3 as shown in FIG.
この場合、偏向コイル7aの内径は電子銃に近い方で縦長
の楕円S3、フアンネル部側では横長の楕円S4となるよう
に構成される。In this case, the inner diameter of the deflection coil 7a is vertically long ellipse S 3 in closer to the electron gun configured to be horizontally long ellipse S 4 in Fuan'neru side.
［発明の効果］ 以上説明したように、本発明の偏平形のブラウン管の偏
向装置は、偏向ヨークの中心軸が蛍光膜面の中心部に向
くように配置しているから、偏向ヨークの出口側から見
ると電子ビームが画面の上端辺及び下端辺へ向かうとき
の偏向角の差が小さくなり、上下ピン歪みも従来の偏平
型のブラウン管に比較して対象に近くなる。そのため、
偏平ブラウン管で発生する非対象な上下ピン歪みを補正
する歪磁界も、従来の偏向装置によるものよりは小さい
歪磁界とすることができ、偏向装置による補正構造も簡
易化される。また歪補正磁界が小さくなると偏向スポッ
ト歪みも全体的に改善することができるという利点があ
る。[Effects of the Invention] As described above, in the flat type cathode ray tube deflecting device of the present invention, since the central axis of the deflection yoke is arranged to face the central portion of the fluorescent film surface, the exit side of the deflection yoke. As seen from the above, the difference between the deflection angles when the electron beam goes to the upper edge and the lower edge of the screen becomes small, and the upper and lower pin distortion becomes closer to the target as compared with the conventional flat cathode ray tube. for that reason,
The distortion magnetic field that corrects the asymmetrical upper and lower pin distortion generated in the flat cathode ray tube can be made smaller than that of the conventional deflection device, and the correction structure by the deflection device can be simplified. Further, there is an advantage that the deflection spot distortion can be improved as a whole when the distortion correction magnetic field becomes small.
第１図（ａ）（ｂ）は従来の偏平形ブラウン管とその偏
向装置の側面図と平面図、第２図はピン歪みを示すラス
タ波形図、第３図はこの発明の一実施例を示す側面図、
第４図は補正磁界を示す説明図、第５図、第６図はこの
発明の他の実施例を示す側面図、第７図は第５図のＡ−
Ａ′線の断面図、第８図はこの発明の偏向装置の他の実
施例を示す側面図である。 図中 １はネック部、２はフアンネル部、３は表示部、
７は偏向装置、7aは偏向コイル、7bはフエライトコアを
示す。1 (a) and 1 (b) are a side view and a plan view of a conventional flat cathode ray tube and its deflecting device, FIG. 2 is a raster waveform diagram showing pin distortion, and FIG. 3 is an embodiment of the present invention. Side view,
FIG. 4 is an explanatory view showing a correction magnetic field, FIGS. 5 and 6 are side views showing another embodiment of the present invention, and FIG. 7 is A- in FIG.
FIG. 8 is a sectional view taken along the line A ', and FIG. 8 is a side view showing another embodiment of the deflecting device of the present invention. In the figure, 1 is a neck part, 2 is a funnel part, 3 is a display part,
Reference numeral 7 is a deflecting device, 7a is a deflection coil, and 7b is a ferrite core.
Claims (1)
れ、かつ、前記電子銃の軸が前記蛍光膜面を横切らない
偏平形のブラウン管に対し、偏向ヨークの中心軸が前記
蛍光膜面のほぼ中心に向くように傾けた偏向装置を前記
ブラウン管のネック部に装着したことを特徴とする偏平
形ブラウン管の偏向装置。1. A flat cathode ray tube having a fluorescent film surface inclined with respect to the axis of the electron gun and having the axis of the electron gun not traversing the surface of the fluorescent film. A flat type cathode ray tube deflecting device, wherein a deflecting device tilted so as to face substantially the center of a film surface is attached to a neck portion of the cathode ray tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59142249A JPH079785B2 (en) | 1984-07-11 | 1984-07-11 | Deflection device for flat cathode ray tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59142249A JPH079785B2 (en) | 1984-07-11 | 1984-07-11 | Deflection device for flat cathode ray tubes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6122541A JPS6122541A (en) | 1986-01-31 |
| JPH079785B2 true JPH079785B2 (en) | 1995-02-01 |
Family
ID=15310912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59142249A Expired - Fee Related JPH079785B2 (en) | 1984-07-11 | 1984-07-11 | Deflection device for flat cathode ray tubes |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH079785B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50180A (en) * | 1973-05-15 | 1975-01-06 | ||
| JPS5750750A (en) * | 1980-09-12 | 1982-03-25 | Sony Corp | Deflector for flat picture tube |
-
1984
- 1984-07-11 JP JP59142249A patent/JPH079785B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6122541A (en) | 1986-01-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |