JPS59221170A - Circuit for correcting distortion in horizontal deflection linearity - Google Patents
Circuit for correcting distortion in horizontal deflection linearityInfo
- Publication number
- JPS59221170A JPS59221170A JP9641883A JP9641883A JPS59221170A JP S59221170 A JPS59221170 A JP S59221170A JP 9641883 A JP9641883 A JP 9641883A JP 9641883 A JP9641883 A JP 9641883A JP S59221170 A JPS59221170 A JP S59221170A
- Authority
- JP
- Japan
- Prior art keywords
- coil
- horizontal deflection
- linearity
- deflection
- series
- 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
- 238000012937 correction Methods 0.000 claims abstract description 31
- 239000003990 capacitor Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 9
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
- H04N3/22—Circuits for controlling dimensions, shape or centering of picture on screen
- H04N3/23—Distortion correction, e.g. for pincushion distortion correction, S-correction
- H04N3/237—Distortion correction, e.g. for pincushion distortion correction, S-correction using passive elements, e.g. diodes
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Details Of Television Scanning (AREA)
Abstract
Description
【発明の詳細な説明】
(1)発明の技術分野
本発明は水平偏向の直線性を極めて容易に調整できる水
平偏向直線性歪補正回路に関する。DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a horizontal deflection linearity distortion correction circuit that can extremely easily adjust the linearity of horizontal deflection.
(2)従来技術と問題点
従来テレビジョン受像機などに使用する陰極線管では陰
極から螢光膜へ放出される電子流を、螢光面上で水平・
垂直方向に偏向するため偏向コイルを使用することが殆
どである。水平出力トランジスタTRのヘースに正パル
スを加えオンとし、偏向コイルLyに時間と共に直線的
に増加する電流を流す。(第2図に示す電流波形図の時
刻TIの状態。)このときコンデンサCs(容量値は1
〜10数μF)が直流阻止の役目を果たし電源Eがらチ
ョークコイルLoを介して充電されるから、偏向コイル
Lyにとって実質的に直流電源として動作する。同時に
後述するようにCsは偏向コイルLyと直列共振させ8
字歪補正の役目を果たす。(2) Conventional technology and problems In cathode ray tubes used in conventional television receivers, the electron flow emitted from the cathode to the phosphor film is horizontal and horizontal on the phosphor surface.
Most often, a deflection coil is used for vertical deflection. A positive pulse is applied to the terminal of the horizontal output transistor TR to turn it on, and a current that increases linearly with time flows through the deflection coil Ly. (The state at time TI in the current waveform diagram shown in Figure 2.) At this time, the capacitor Cs (capacitance value is 1
~10-odd μF) acts as a direct current blocker and is charged from the power source E via the choke coil Lo, so it essentially operates as a direct current power source for the deflection coil Ly. At the same time, as described later, Cs resonates in series with the deflection coil Ly.
It plays the role of correcting character distortion.
偏向コイルLyの増加電流のため電子流は、螢光面の水
平方向一端から他端へ走査される(第2図の時刻T2)
。そこでトランジスタTRのヘースに負パルスを加えオ
フすると、偏向コイルを流れる電流はインダクタンスの
慣性のため同方向に流れ続け、電流値は減少するもコン
デンサCの充電を開始する。コンデンサCの両端電圧は
共振現象のため増大する。そして偏向コイルの電流が零
になったとき(第2図時刻T3)共振コンデンサCの電
圧は最大値となり、次いで偏向コイルの電流が逆向きに
流れ始め、コンデンサCの電圧は最小値で、逆向き電流
は最大となる(第2図時刻T4)そのとき偏向コイルの
逆起電力のためダンパーダイオードDが導通し電流は同
方向に流れ零に近づく。零になったとき第2図時刻T5
は時刻Tlの1サイクル後の状態である。ここで第2図
は理想的な状態を示していて、実際は偏向コイルLyの
抵抗分、出力トランジスタTRの飽和抵抗、ダンパーダ
イオードDの非直線性などの原因で、偏向コイルに流れ
る電流の波形図は第3図A1に示すように歪を生じてい
る。第3図Bは水平偏向直線性歪について対応して示す
図である。S字歪補正コンデンザCsを偏向コイルLy
と直列共振させ、偏向電流に重畳してS字形の電流を流
し、水平偏向直線性を良好にしている。5字補正コンデ
ンサCsが大きいとき偏向コイル電流は第3図A2、直
線性は第3図B2となり、Csが小さいと第3図A3.
B3となる。そして水平偏向直線性歪補正コイルL c
をCsに更に直列接続し、走査前半の偏向電流の傾斜を
変え第3図A4に示す破線から実線のように補正を行う
ことも提案済みである。Due to the increasing current of the deflection coil Ly, the electron current is scanned from one end of the fluorescent surface in the horizontal direction to the other end (time T2 in Fig. 2).
. Therefore, when a negative pulse is applied to the transistor TR to turn it off, the current flowing through the deflection coil continues to flow in the same direction due to the inertia of the inductance, and although the current value decreases, it starts charging the capacitor C. The voltage across capacitor C increases due to the resonance phenomenon. When the current in the deflection coil becomes zero (time T3 in Figure 2), the voltage in the resonant capacitor C reaches its maximum value, and then the current in the deflection coil starts to flow in the opposite direction, and the voltage in the capacitor C reaches its minimum value, and the voltage in the resonant capacitor C reaches its maximum value. The direction current reaches its maximum (time T4 in FIG. 2), at which time the damper diode D conducts due to the back electromotive force of the deflection coil, and the current flows in the same direction and approaches zero. When it becomes zero, time T5 in Figure 2
is the state one cycle after time Tl. Here, Figure 2 shows an ideal state, but in reality, it is a waveform diagram of the current flowing through the deflection coil due to factors such as the resistance of the deflection coil Ly, the saturation resistance of the output transistor TR, and the nonlinearity of the damper diode D. is distorted as shown in FIG. 3A1. FIG. 3B is a corresponding diagram showing horizontal deflection linearity distortion. The S-shaped distortion correction capacitor Cs is connected to the deflection coil Ly.
This produces series resonance with the deflection current, and causes an S-shaped current to flow superimposed on the deflection current, thereby improving horizontal deflection linearity. When the figure 5 correction capacitor Cs is large, the deflection coil current is A2 in FIG. 3, and the linearity is B2 in FIG. 3, and when Cs is small, the current is A3 in FIG.
It becomes B3. and horizontal deflection linearity distortion correction coil L c
It has also been proposed to further connect Cs in series and change the slope of the deflection current in the first half of scanning to perform correction from the broken line to the solid line shown in FIG. 3 A4.
しかし、ディスプレイ装置のように陰極線管表示装置と
して水平偏向直線性の極度な良好さが要求されるとき、
補正コイルLc、補正コンデンサC3の両者を同時に最
良状態に調整することは、一方の素子の調整により直線
性が全体的に変化するため、複雑で極めて面倒であった
。特に前述のようなコンデンサCsの値を微調整するこ
とが困難であった。However, when extremely good horizontal deflection linearity is required for cathode ray tube display devices such as display devices,
Simultaneously adjusting both the correction coil Lc and the correction capacitor C3 to the best condition is complicated and extremely troublesome because the adjustment of one element changes the linearity as a whole. In particular, it has been difficult to finely adjust the value of the capacitor Cs as described above.
(3)発明の目的
本発明の目的は前述の欠点を改善し、使用部品数を少な
くし、水平偏向直線性を容易に調整出来る水平偏向直線
性歪補正回路を提供することにある。(3) Object of the Invention An object of the present invention is to provide a horizontal deflection linearity distortion correction circuit that can improve the above-mentioned drawbacks, reduce the number of parts used, and easily adjust the horizontal deflection linearity.
(4)発明の構成
前述の目的を達成するための本発明の構成は、陰極線管
の電子流を水平方向に偏向するだめの偏向コイルと、直
線性歪補正用コイルとを直列接続した水平偏向直線性歪
補正回路において、前記補正用コイルとして永久磁石に
より磁気バイアスされた可変インダクタンス2個を互い
に逆極性に直列接続して使用することである。(4) Structure of the Invention The structure of the present invention to achieve the above-mentioned object is to provide a horizontal deflection system in which a deflection coil for horizontally deflecting the electron flow of a cathode ray tube and a linearity distortion correction coil are connected in series. In the linearity distortion correction circuit, two variable inductances magnetically biased by permanent magnets are connected in series with opposite polarities and used as the correction coil.
(5)発明の実施例
第4図は本発明の一実施例を示す回路構成図である。第
1図と同一符号は同様のものを示す。(5) Embodiment of the invention FIG. 4 is a circuit diagram showing an embodiment of the invention. The same reference numerals as in FIG. 1 indicate similar parts.
Lcl、Lc2はそれぞれ水平偏向直線性歪補正コイル
を示し、互いに逆極性に直列接続されている。即らフェ
ライト磁心に巻回したコイルに対し、バイアス磁界を与
える磁石とコイル巻回方向とを考慮し、両コイル冠同一
方向に直流電流を流したとき、その?1fffiの変化
に対するインダクタンスの変化が正方向電流に対して起
こるコイルと、負方向電流に対して起こるコイルとに区
分しておく。Lcl and Lc2 each indicate horizontal deflection linearity distortion correction coils, which are connected in series with opposite polarities. In other words, considering the magnet that provides the bias magnetic field and the coil winding direction for a coil wound around a ferrite magnetic core, when a DC current is passed in the same direction through both coil crowns, what happens? The coils are divided into coils in which a change in inductance with respect to a change of 1fffi occurs for a positive direction current, and coils for a negative direction current.
そのため例えば水平偏向の前半におGJる直線性補正を
Lclにより、後半にお番ノる補正をLc2により行う
ようにすることができる。このとき要求される3字歪補
正を含めた補正を偏向の前、後半で互いに独立して行う
ことができる。 水平偏向直線性歪補正コイルの動作を
更に説明すると、フェライト磁心にこ1イルを巻回した
とき、磁界T(の変化に対する磁束密度2Bの変化は、
第5図へに示すようにヒステリシス曲線を描いている。Therefore, for example, GJ linearity correction in the first half of horizontal deflection can be performed by Lcl, and linearity correction in the latter half can be performed by Lc2. Corrections including the three-character distortion correction required at this time can be performed independently of each other before and after the deflection. To further explain the operation of the horizontal deflection linearity distortion correction coil, when the coil is wound around a ferrite magnetic core, the change in magnetic flux density 2B with respect to the change in magnetic field T is as follows:
A hysteresis curve is drawn as shown in FIG.
Hの値のバイアス磁界を与えるような、永久磁石を付加
するとB−H曲線は第5図Bに示すようになる。When a permanent magnet is added to provide a bias magnetic field with a value of H, the B-H curve becomes as shown in FIG. 5B.
ソノタメ磁界Hと透磁率μとの関係は第5図cに示すよ
うになり、磁界Ho= Hz間ではμの変化は殆どなく
、Ho= Hz間で大きくμが変化する。インダクタン
スLと電流■の変化に対応させると第5図りのようにな
る。即ち負方向電流の変化に対しインダクタンスLの変
化する水平偏向直線性歪補正コイルが得られる。The relationship between the magnetic field H and the magnetic permeability μ is as shown in FIG. If it is made to correspond to changes in inductance L and current (2), the result will be as shown in the fifth diagram. That is, a horizontal deflection linearity distortion correction coil in which the inductance L changes with respect to a change in the negative direction current is obtained.
(6)発明の効果
このようにして本発明によると、8字歪補正素子として
のコンデンサを使用せず、偏向の前半と後半とを独立的
に補正できるから調整作業が極めて容易にできる。また
8字歪補正コンデンサを使用しないため、偏向コイルと
電源とを直結することができ、電源チョークコイルも不
要となる。回路素子が少なくなるため、回路損失が減少
し、動作能率が高くなるという効果を有する。(6) Effects of the Invention As described above, according to the present invention, the first half and the second half of deflection can be corrected independently without using a capacitor as a figure-8 distortion correction element, making adjustment work extremely easy. Furthermore, since a figure-8 distortion correction capacitor is not used, the deflection coil can be directly connected to the power supply, and a power supply choke coil is also unnecessary. Since the number of circuit elements is reduced, circuit loss is reduced and operating efficiency is increased.
第1図は従来の水平偏向直線性歪補正回路を示す回路構
成図、
第2図は第1図の理想的動作波形図、
第3図は第1図の直線性歪補正動作を説明するための図
、
第4図は本発明の一実施例を示す回路構成図、第5図は
第4図における直線性歪補正用コイルの動作説明図であ
る。
TR−水平出力トランジスタ
Ly−偏向コイル C−共振コンデンサLc、Lcl
、Lc2
一水平偏向直線性歪補正コイル
D−ダンパーダイオード
特許出願人 富士通株式会社
代理人 弁理士 鈴木栄祐
編−
向
第2図
2
2
3 4
第4区
第5図Fig. 1 is a circuit configuration diagram showing a conventional horizontal deflection linearity distortion correction circuit, Fig. 2 is an ideal operating waveform diagram of Fig. 1, and Fig. 3 is for explaining the linearity distortion correction operation of Fig. 1. FIG. 4 is a circuit configuration diagram showing an embodiment of the present invention, and FIG. 5 is an explanatory diagram of the operation of the linear distortion correction coil in FIG. 4. TR - Horizontal output transistor Ly - Deflection coil C - Resonant capacitor Lc, Lcl
, Lc2 - Horizontal deflection linearity distortion correction coil D - Damper diode Patent applicant: Fujitsu Limited Agent Patent attorney: Edited by Eisuke Suzuki - Figure 2 2 2 3 4 Section 4 Figure 5
Claims (1)
ルと、直線性歪補正用コイルとを直列接続した水平偏向
直線性歪補正回路において、前記補正用コイルとして永
久磁石により磁気バイアスされた可変インダクタンス2
個を互いに逆極性に直列接続して使用することを特徴と
する水平偏向直線性歪補正回路。In a horizontal deflection linearity distortion correction circuit in which a deflection coil for horizontally deflecting the electron flow of a cathode ray tube and a linearity distortion correction coil are connected in series, the correction coil is a variable voltage biased magnetically by a permanent magnet. inductance 2
1. A horizontal deflection linearity distortion correction circuit characterized in that two circuits are connected in series with opposite polarities.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9641883A JPS59221170A (en) | 1983-05-31 | 1983-05-31 | Circuit for correcting distortion in horizontal deflection linearity |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9641883A JPS59221170A (en) | 1983-05-31 | 1983-05-31 | Circuit for correcting distortion in horizontal deflection linearity |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS59221170A true JPS59221170A (en) | 1984-12-12 |
Family
ID=14164424
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9641883A Pending JPS59221170A (en) | 1983-05-31 | 1983-05-31 | Circuit for correcting distortion in horizontal deflection linearity |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59221170A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6214856U (en) * | 1985-07-10 | 1987-01-29 | ||
JPS6284265U (en) * | 1985-11-12 | 1987-05-29 | ||
FR2685598A1 (en) * | 1991-12-20 | 1993-06-25 | Sgs Thomson Microelectronics | LINE SCAN CORRECTION SYSTEM. |
-
1983
- 1983-05-31 JP JP9641883A patent/JPS59221170A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6214856U (en) * | 1985-07-10 | 1987-01-29 | ||
JPH0520048Y2 (en) * | 1985-07-10 | 1993-05-26 | ||
JPS6284265U (en) * | 1985-11-12 | 1987-05-29 | ||
FR2685598A1 (en) * | 1991-12-20 | 1993-06-25 | Sgs Thomson Microelectronics | LINE SCAN CORRECTION SYSTEM. |
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