JPS5967782A - Controller of picture amplitude - Google Patents
Controller of picture amplitudeInfo
- Publication number
- JPS5967782A JPS5967782A JP17791682A JP17791682A JPS5967782A JP S5967782 A JPS5967782 A JP S5967782A JP 17791682 A JP17791682 A JP 17791682A JP 17791682 A JP17791682 A JP 17791682A JP S5967782 A JPS5967782 A JP S5967782A
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- voltage
- capacitor
- screen
- current
- 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
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
- H04N3/223—Controlling dimensions
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】
産業上の利用分野
本発明はテレビジョン受像機の陰極線管の画面の振幅を
一定に制御する画面振幅制御装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a screen amplitude control device for controlling the screen amplitude of a cathode ray tube of a television receiver to be constant.
従来例の構成とその問題点
第１図は従来例におけるテレビジョン受像機の要部の回
路図を示しており、水平垂直発振回路の出力は水平偏向
出力回路２と垂直偏向出力回路３に加えられる。直流電
源６の電圧は抵抗１１な介してフライバンクトランス４
に供給される。フライバックトランス４の１次巻線６に
はノくルス電圧が発生しており、これを２次巻線７で昇
圧して陰極線管８の陽極電圧として供給する。水平偏向
コイル９には水平偏向電流が供給され、垂直偏向コイル
１０には垂直偏向電流が供給される一陽極電圧は陽極負
荷電流が増加すると低下する。Configuration of the conventional example and its problems Figure 1 shows a circuit diagram of the main parts of the television receiver in the conventional example, and the output of the horizontal/vertical oscillation circuit is It will be done. The voltage of the DC power supply 6 is applied to the fly bank transformer 4 through a resistor 11.
supplied to A Norse voltage is generated in the primary winding 6 of the flyback transformer 4, which is boosted by the secondary winding 7 and supplied as an anode voltage to the cathode ray tube 8. A horizontal deflection current is supplied to the horizontal deflection coil 9, and a vertical deflection current is supplied to the vertical deflection coil 10.One anode voltage decreases as the anode load current increases.
これはフライバックトランス４で１次巻線の電圧を２０
倍程度昇圧して陽極電圧とするため、出力インピーダン
スが高く、負荷電流により陽極電圧が低下する、
０・・・・・・電子ビームの偏向角度
Ｉｎ ・・・偏向電流
Ｖａ ・・・陰極線管の陽極電圧
ｋ・・・・・・定数
（１）式に示すように電子ビームの偏向角度、即ち陰極
線管上の画面振巾は陽極電圧の平方根に反比例する。This is a flyback transformer 4 with a primary winding voltage of 20
The output impedance is high and the anode voltage is increased by about twice as much as the anode voltage, and the anode voltage decreases due to the load current. Anode voltage k: constant As shown in equation (1), the deflection angle of the electron beam, ie, the screen width on the cathode ray tube, is inversely proportional to the square root of the anode voltage.
このため陽極電圧が低下すると陰極線管上の画面振ｒｊ
ｊが垂直、水平両方向に犬きくなり、周辺の映像画面が
見え々くなる欠点があった。このだめ従来水平振「ＩＪ
の変化に対しては次のような対策をしていた。第１図の
水平偏向出力回路の電源回路に直列抵抗１１を接続する
。For this reason, when the anode voltage decreases, the screen shake on the cathode ray tube rj
This had the disadvantage that the j was distorted both vertically and horizontally, making it difficult to see the surrounding video screen. Konodame conventional horizontal vibration “IJ”
The following measures were taken to address the changes. A series resistor 11 is connected to the power supply circuit of the horizontal deflection output circuit shown in FIG.
そして、
Ｖａ ＝ ６Ｖｈ 、 Ｉｎ ＝ｍＶｈ −−（
２）ｖｈ・・・・・・直流電源５の電源電圧ｌ、ｍ・・
・・・・定数
水平偏向出力回路２はスイッチング回路であるため偏向
電流は電源電圧に比例する。And Va = 6Vh, In = mVh --(
2) vh...Power supply voltage l, m... of DC power supply 5
...Since the constant horizontal deflection output circuit 2 is a switching circuit, the deflection current is proportional to the power supply voltage.
（１）式より（２）式を代入する。Substitute equation (2) from equation (1).
偏向角度（画面振幅）は電源電圧ｖｈの平方根に比例す
る。よ−て電源電圧を低下させれば陽極電圧が低下して
も偏向電流も減少して画面振巾は減少する。The deflection angle (screen amplitude) is proportional to the square root of the power supply voltage vh. Therefore, if the power supply voltage is lowered, even if the anode voltage is lowered, the deflection current will also be reduced and the screen width will be reduced.
陽極電圧が陽極電流の増加によって低下して水平振巾が
増加しても、水平偏向出力回路の電源電圧を低下させれ
ば画面振巾は減少し、増加分を抑制して一定振ｄ］とす
ることはできる。Even if the anode voltage decreases due to an increase in the anode current and the horizontal amplitude increases, the screen width will decrease if the power supply voltage of the horizontal deflection output circuit is lowered, and the increase will be suppressed to maintain a constant amplitude d]. You can do it.
第１図に示す直列抵抗１１により陽極電流が増加すると
フライバックトランスに流入する電流が増加してそれに
より電圧降下を生じ、水平偏向出力回路の電源電圧が低
下し、水平振巾の増加が抑制される。When the anode current increases due to the series resistor 11 shown in Figure 1, the current flowing into the flyback transformer increases, which causes a voltage drop, lowering the power supply voltage of the horizontal deflection output circuit, and suppressing the increase in horizontal amplitude. be done.
一方垂直振巾は水平方向と比較して若干変化は目立ちに
くいので従来補正されなかったが上記の方法で水平振１
］の変化が防止されると目立ち、好ましくない。On the other hand, changes in the vertical amplitude are less noticeable compared to the horizontal direction, so conventionally they were not corrected, but the above method can correct the horizontal amplitude.
] If the change is prevented, it will be noticeable and undesirable.
発明の目的
本発明は上記の点に留意し簡易な回路で垂直振［１Ｊの
変化を防止することを目的とするものである。OBJECT OF THE INVENTION The present invention takes the above points into consideration and aims to prevent changes in vertical vibration [1J] using a simple circuit.
発明の構成
本発明はフライバックトランスの２次巻線の低圧側端子
と基準電位点間に第１の抵抗を接続し、上記端子を第２
の抵抗を介して垂直偏向電流調整回路に接続し、陰極線
管の隣接電流が増加し、た場合に垂直偏向電流を減少さ
せ画面振幅を一定にしたものである、
実施例の説明
以下本発明の一実施例について図面を参照して説明する
。第２図に本発明の一実施例を示す。フライバックトラ
ンスの高電圧出力巻線７の一端とアース間に抵抗１２を
接続する。垂直偏向電流３の垂直振幅調整回路を抵抗１
５．可変抵抗器１４゜コンデンサ１６ＶＣよって構成す
る。抵抗１５とコンデンサ１６の交点に抵抗１７の一端
を接続し。Structure of the Invention The present invention connects a first resistor between the low voltage side terminal of the secondary winding of a flyback transformer and a reference potential point, and connects the above terminal to a second resistor.
is connected to the vertical deflection current adjustment circuit through a resistor, and when the adjacent current of the cathode ray tube increases, the vertical deflection current is decreased and the screen amplitude is kept constant. One embodiment will be described with reference to the drawings. FIG. 2 shows an embodiment of the present invention. A resistor 12 is connected between one end of the high voltage output winding 7 of the flyback transformer and ground. The vertical amplitude adjustment circuit for the vertical deflection current 3 is connected to the resistor 1.
5. It consists of a variable resistor of 14° and a capacitor of 16VC. Connect one end of resistor 17 to the intersection of resistor 15 and capacitor 16.
他の一端は前述の抵抗１２とフライノくツクトランスの
巻線７の交点に接続する。垂直振巾調整回路はコンデン
サ１６の充電電圧が低下すると垂直偏向電流が減少する
構成となっており、陰極線の陽極電流が増加して陽極電
圧が低下した場合、抵抗１２と巻線７の交点電圧は低下
してその結果、抵抗１７を介してコンデンサ１６と接続
されているだめ、コンデンサ１６の電圧も低下する。よ
って垂直偏向電流が減少することにより抵抗１７の値を
選ぶことによって陰極線管の陽極電圧が低下しても画面
の垂直振巾を一定とすることができる。The other end is connected to the intersection of the aforementioned resistor 12 and the winding 7 of the flywheel transformer. The vertical amplitude adjustment circuit is configured such that the vertical deflection current decreases when the charging voltage of the capacitor 16 decreases, and when the anode current of the cathode wire increases and the anode voltage decreases, the intersection voltage between the resistor 12 and the winding 7 decreases. As a result, since the capacitor 16 is connected to the capacitor 16 through the resistor 17, the voltage of the capacitor 16 also decreases. Therefore, by selecting the value of the resistor 17 by reducing the vertical deflection current, the vertical amplitude of the screen can be kept constant even if the anode voltage of the cathode ray tube is reduced.
発明の効果
以上のように本発明によれば陰極線管の画面の明るさに
関係なく画面の振幅を一定に制御することができる。Effects of the Invention As described above, according to the present invention, the amplitude of the screen can be controlled to be constant regardless of the brightness of the screen of the cathode ray tube.
第１図は従来例における画面振幅制御装置の回路図、第
２図は本発明の一実施例における画面振幅制御装置の回
路図である。
７・・・・・・フライバックトランスの高電圧巻線、１
２・・・・・・抵抗＋１７・・・・・・抵抗、１６・・
・・・・コンデンサ、１４・・・・・・可変抵抗、１５
・・・・・・抵抗−３・・・・・・垂直偏向出力回路−FIG. 1 is a circuit diagram of a screen amplitude control device in a conventional example, and FIG. 2 is a circuit diagram of a screen amplitude control device in an embodiment of the present invention. 7... High voltage winding of flyback transformer, 1
2...Resistance +17...Resistance, 16...
... Capacitor, 14 ... Variable resistor, 15
...Resistance-3...Vertical deflection output circuit-
Claims (1)
を第１の抵抗を介して基準電位点に接続し、上記端子に
第２の抵抗の一端を接続し、この抵抗の他端を垂直偏向
電流の調整回路に接続し、陰極線管の陽極電流が増加し
て陽極電圧が低下した場合に垂直偏向電流を減少させ陰
極線管の画面振幅を一定に制御することを特徴とする画
面振幅制御装置。The low voltage side terminal of the high voltage output winding of the flyback transformer is connected to a reference potential point via a first resistor, one end of a second resistor is connected to the above terminal, and the other end of this resistor is connected to a vertical deflection terminal. A screen amplitude control device that is connected to a current adjustment circuit and controls the screen amplitude of the cathode ray tube to a constant level by decreasing the vertical deflection current when the anode current of the cathode ray tube increases and the anode voltage decreases.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17791682A JPS5967782A (en) | 1982-10-08 | 1982-10-08 | Controller of picture amplitude |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17791682A JPS5967782A (en) | 1982-10-08 | 1982-10-08 | Controller of picture amplitude |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5967782A true JPS5967782A (en) | 1984-04-17 |
Family
ID=16039300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17791682A Pending JPS5967782A (en) | 1982-10-08 | 1982-10-08 | Controller of picture amplitude |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5967782A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3607064A1 (en) * | 1985-03-05 | 1986-09-11 | Sgs Microelettronica S.P.A., Catania | CONTROL CIRCUIT WITH COMPENSATION OF THE ANODE VOLTAGE VARIATIONS FOR THE VERTICAL DEFLECTION LEVEL OF A TELEVISION |
| EP0253445A2 (en) * | 1986-07-18 | 1988-01-20 | Philips Electronics Uk Limited | Television line output circuit |
-
1982
- 1982-10-08 JP JP17791682A patent/JPS5967782A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3607064A1 (en) * | 1985-03-05 | 1986-09-11 | Sgs Microelettronica S.P.A., Catania | CONTROL CIRCUIT WITH COMPENSATION OF THE ANODE VOLTAGE VARIATIONS FOR THE VERTICAL DEFLECTION LEVEL OF A TELEVISION |
| EP0253445A2 (en) * | 1986-07-18 | 1988-01-20 | Philips Electronics Uk Limited | Television line output circuit |
| EP0253445A3 (en) * | 1986-07-18 | 1991-01-16 | Philips Electronics Uk Limited | Television line output circuit |
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