JPH0553521A - Automatic tracking type crt display monitor - Google Patents

Automatic tracking type crt display monitor

Info

Publication number
JPH0553521A
JPH0553521A JP24033991A JP24033991A JPH0553521A JP H0553521 A JPH0553521 A JP H0553521A JP 24033991 A JP24033991 A JP 24033991A JP 24033991 A JP24033991 A JP 24033991A JP H0553521 A JPH0553521 A JP H0553521A
Authority
JP
Japan
Prior art keywords
circuit
horizontal
display monitor
switching
crt display
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
Application number
JP24033991A
Other languages
Japanese (ja)
Inventor
Katsumasa Iwami
勝政 岩見
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP24033991A priority Critical patent/JPH0553521A/en
Publication of JPH0553521A publication Critical patent/JPH0553521A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To obtain the automatic tracking type CRT display monitor which stably operates in a wide horizontal frequency range. CONSTITUTION:A switching circuit 8 for switching the inductance of the horizontal deflecting coil of a deflecting yoke 2 and a control circuit 7 which sends out a switching signal corresponding to a horizontal frequency to this switching circuit 8 are provided to lighten the load on a DC-DC converter 6 which varies and applies a +B source voltage to a deflecting circuit 3. Therefore, even when automatic tracking is performed over a wide frequency range, the variation range of the +B source voltage need not be widened and stable operation is enabled.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、入力される映像信号
の水平周波数に自動的に追従して最適な画像を映し出す
ように成されたオートトラッキング型CRTディスプレ
イモニタに関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auto-tracking CRT display monitor adapted to automatically follow the horizontal frequency of an input video signal to display an optimum image.

【0002】[0002]

【従来の技術】図3は従来のオートトラッキング型CR
Tディスプレイモニタを示す構成図である。図におい
て、1はCRT(陰極線管)、2はこのCRT1の電子
ビームを水平及び垂直に偏向させる磁界を発生させる水
平偏向コイル及び垂直偏向コイルから成る偏向ヨーク、
3は偏向ヨーク2に偏向電流を供給するための偏向回
路、4は映像信号を増幅してCRT1のカソードに供給
する映像回路、6はオートトラッキングに必要な水平周
波数に比例して変化する電圧を得るためのDC−DCコ
ンバータ、7は入力映像信号の水平周波数に応じてCR
T1の画面位置等を最適にすると共に、偏向回路3を制
御する制御回路、5は各回路に所定の電源電圧を供給す
る電源回路である。
2. Description of the Related Art FIG. 3 is a conventional auto-tracking type CR.
It is a block diagram which shows a T display monitor. In the figure, 1 is a CRT (cathode ray tube), 2 is a deflection yoke composed of a horizontal deflection coil and a vertical deflection coil for generating a magnetic field for horizontally and vertically deflecting the electron beam of the CRT 1.
Reference numeral 3 is a deflection circuit for supplying a deflection current to the deflection yoke 2, 4 is a video circuit for amplifying a video signal and supplying it to the cathode of the CRT 1, and 6 is a voltage which changes in proportion to the horizontal frequency required for auto-tracking. DC-DC converter for obtaining, CR 7 according to the horizontal frequency of the input video signal
A control circuit 5 that optimizes the screen position of T1 and controls the deflection circuit 3 is a power supply circuit that supplies a predetermined power supply voltage to each circuit.

【0003】次に動作について説明する。偏向回路3は
入力映像信号の水平及び垂直の周波数に同期したノコギ
リ波電流を作り、これを偏向ヨーク2に流す。偏向ヨー
ク2では、このノコギリ波電流により磁界を発生させ、
電子ビームを水平・垂直に偏向させてCRT1の蛍光面
上に画像を組み立てる。
Next, the operation will be described. The deflection circuit 3 produces a sawtooth wave current that is synchronized with the horizontal and vertical frequencies of the input video signal, and supplies this to the deflection yoke 2. In the deflection yoke 2, a magnetic field is generated by the sawtooth wave current,
An image is assembled on the phosphor screen of CRT1 by deflecting the electron beam horizontally and vertically.

【0004】また、オートトラッキングを行うために、
水平周波数が変化しても常に一定振幅のノコギリ波電流
を偏向ヨーク2に供給できるように、電源回路5から供
給される水平偏向用の+B電源電圧を、制御回路7の制
御に応じてDC−DCコンバータ6で水平周波数に比例
して増加する電圧に変換し、この電圧により偏向回路3
を制御している。
In addition, in order to perform automatic tracking,
The + B power supply voltage for horizontal deflection supplied from the power supply circuit 5 is controlled by the control circuit 7 so that the sawtooth wave current having a constant amplitude can be supplied to the deflection yoke 2 even if the horizontal frequency changes. The DC converter 6 converts the voltage into a voltage that increases in proportion to the horizontal frequency.
Are in control.

【0005】また、映像回路4は入力された映像信号を
増幅して、CRT1のカソードに加え、蛍光面上に映像
を映し出す。制御回路7は入力映像信号の水平周波数を
判別して、画面位置等をあらかじめプリセットしたデー
タにより最適値にする。
Further, the video circuit 4 amplifies the input video signal and, in addition to the cathode of the CRT 1, projects an image on the phosphor screen. The control circuit 7 discriminates the horizontal frequency of the input video signal and sets the screen position and the like to an optimum value based on preset data.

【0006】[0006]

【発明が解決しようとする課題】従来のオートトラッキ
ング型CRTディスプレイモニタは以上のように構成さ
れているので、例えば、水平周波数20KHz〜64K
Hzなどの広い範囲でオートトラッキングを実現するた
めには、+B電源電圧を3倍以上可変させなければなら
ず、このためDC−DCコンバータ6を上記の可変範囲
で安定に動作させることが困難になる等の問題があっ
た。
Since the conventional auto-tracking type CRT display monitor is constructed as described above, for example, the horizontal frequency is 20 KHz to 64 K.
In order to realize auto-tracking in a wide range such as Hz, it is necessary to change the + B power supply voltage three times or more, which makes it difficult to operate the DC-DC converter 6 stably in the above-mentioned variable range. There was a problem such as becoming.

【0007】この発明は上記のような課題を解消するた
めになされたもので、+B電源電圧の可変範囲を少なく
し、性能を向上させることのできるオートトラッキング
型CRTディスプレイモニタを得ることを目的としてい
る。
The present invention has been made to solve the above problems, and an object thereof is to obtain an auto-tracking type CRT display monitor capable of reducing the variable range of the + B power supply voltage and improving the performance. There is.

【0008】[0008]

【課題を解決するための手段】この発明に係るオートト
ラッキング型CRTディスプレイモニタは、水平偏向コ
イルのインダクタンスを水平周波数に応じて数段階に切
替える切替手段を設けたものである。
The auto-tracking type CRT display monitor according to the present invention is provided with switching means for switching the inductance of the horizontal deflection coil in several stages according to the horizontal frequency.

【0009】[0009]

【作用】この発明におけるオートトラッキング型CRT
ディスプレイモニタは、切替手段により水平周波数を検
出して水平偏向コイルを切替えるので、+B電源電圧の
可変範囲を小さくして、DC−DCコンバータの負担を
軽くすることができる。
The automatic tracking CRT according to the present invention
Since the display monitor detects the horizontal frequency by the switching means and switches the horizontal deflection coil, it is possible to reduce the variable range of the + B power supply voltage and reduce the load on the DC-DC converter.

【0010】[0010]

【実施例】【Example】

実施例1.以下、この発明の一実施例を図について説明
する。図1において、1〜7は上記図3の従来装置と全
く同一のものである。8は水平偏向コイルの切替回路で
あり、制御回路7で検出した入力映像信号の水平周波数
に応じて偏向ヨーク2の水平偏向コイルのインダクタン
スを切替える。この切替回路8と制御回路7とで切替手
段を構成する。
Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 to 7 are exactly the same as the conventional device of FIG. Reference numeral 8 denotes a horizontal deflection coil switching circuit, which switches the inductance of the horizontal deflection coil of the deflection yoke 2 in accordance with the horizontal frequency of the input video signal detected by the control circuit 7. The switching circuit 8 and the control circuit 7 constitute a switching means.

【0011】図2は水平偏向コイルのインダクタンスを
切替えるための回路構成を示すもので、図において、9
1 〜9n は互いに選択的に並列に接続される複数の水平
偏向コイル、10は並列接続する水平偏向コイル91
n を選択するスイッチ回路で、上記切替回路8からの
切替信号により接点が選択される。111 〜11m は互
いに並列に接続されるS字補正用コンデンサ、12は並
列接続するコンデンサ111 〜11m を選択するスイッ
チ回路で、上記切替信号により接点が選択される。
FIG. 2 shows a circuit configuration for switching the inductance of the horizontal deflection coil. In FIG.
1 to 9 n are a plurality of horizontal deflection coils selectively connected in parallel with each other, and 10 is a horizontal deflection coil 9 1 to be connected in parallel
A switch circuit for selecting 9 n selects a contact point by a switching signal from the switching circuit 8. Reference numerals 11 1 to 11 m are S-shaped correction capacitors that are connected in parallel with each other, and 12 is a switch circuit that selects the capacitors 11 1 to 11 m that are connected in parallel, and contacts are selected by the switching signal.

【0012】次に動作について説明する。DC−DCコ
ンバータ6で作られる+B電源電圧は水平周波数が高く
なると上昇する。そこで、水平周波数は何段階かに区切
り、切替回路8からの切替信号により、水平周波数が高
くなると水平偏向コイルのインダクタンスの値が小さく
なるように切替えてDC−DCコンバータ6による+B
電源電圧の上昇を抑える。この切替段数は水平周波数の
スペックに応じて最適値を選ぶようにする。
Next, the operation will be described. The + B power supply voltage generated by the DC-DC converter 6 rises as the horizontal frequency increases. Therefore, the horizontal frequency is divided into several stages, and a switching signal from the switching circuit 8 switches the horizontal deflection coil so that the inductance value of the horizontal deflection coil decreases as the horizontal frequency increases, and the DC-DC converter 6 performs + B.
Suppress the rise in power supply voltage. For this number of switching steps, an optimum value is selected according to the specifications of the horizontal frequency.

【0013】図2において、上記切替信号に応じてスイ
ッチ回路10の各接点が選択的に閉ざされることによ
り、水平偏向コイル91 〜9n のうち水平周波数に応じ
た所定のコイルが接続されて所定のインダクタンス値が
得られる。これと共に、スイッチ回路12の各接点が選
択的に閉ざされてコンデンサ111 〜11m のうちの所
定のコンデンサが接続される。
In FIG. 2, each contact of the switch circuit 10 is selectively closed in response to the switching signal to connect a predetermined coil among the horizontal deflection coils 9 1 to 9 n according to the horizontal frequency. A predetermined inductance value is obtained. At the same time, each contact of the switch circuit 12 is selectively closed to connect a predetermined capacitor among the capacitors 11 1 to 11 m .

【0014】実施例2.なお、上記実施例1では、切替
回路8とDC−DCコンバータ6とを併用したが、切替
段数を増やすことにより、DC−DCコンバータ6を省
略することもできる。
Example 2. Although the switching circuit 8 and the DC-DC converter 6 are used together in the first embodiment, the DC-DC converter 6 can be omitted by increasing the number of switching stages.

【0015】[0015]

【発明の効果】以上のように、この発明によれば、水平
周波数に応じて水平偏向コイルのインダクタンスを切替
えるように構成したので、DC−DCコンバータでの+
B電源電圧の可変範囲を狭くすることができ、このため
DC−DCコンバータが安定に動作すると共に、DC−
DCコンバータに用いられる電界コンデンサの容量が小
さくて済むので安価に実現できる等の効果が得られる。
As described above, according to the present invention, since the inductance of the horizontal deflection coil is switched according to the horizontal frequency, the + in the DC-DC converter is changed.
The variable range of the B power supply voltage can be narrowed, so that the DC-DC converter operates stably and the DC-DC converter operates stably.
Since the capacity of the electric field capacitor used for the DC converter can be small, it is possible to obtain an effect that it can be realized at low cost.

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明の一実施例によるオートトラッキング
型CRTディスプレイモニタの構成図である。
FIG. 1 is a configuration diagram of an auto-tracking CRT display monitor according to an embodiment of the present invention.

【図2】同ディスプレイモニタにおける水平偏向コイル
を切替えるための回路構成を示す回路図である。
FIG. 2 is a circuit diagram showing a circuit configuration for switching a horizontal deflection coil in the display monitor.

【図3】従来のオートトラッキング型CRTディスプレ
イモニタの構成図である。
FIG. 3 is a configuration diagram of a conventional auto-tracking CRT display monitor.

【符号の説明】[Explanation of symbols]

1 CRT 7 制御回路(切替手段) 8 切替回路(切替手段) 91 〜9n 水平偏向コイル1 CRT 7 control circuit (switching means) 8 switching circuit (switching means) 9 1 to 9 n horizontal deflection coil

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 それぞれ水平周波数の異る複数の映像信
号をCRTで表示できるように成されたオートトラッキ
ング型CRTディスプレイモニタにおいて、上記水平周
波数に応じて上記CRTに設けられた水平偏向コイルの
インダクタンス値を変更する切替手段を設けたことを特
徴とするオートトラッキング型CRTディスプレイモニ
タ。
1. An auto-tracking CRT display monitor configured to display a plurality of video signals having different horizontal frequencies on a CRT, wherein an inductance of a horizontal deflection coil provided on the CRT according to the horizontal frequency. An auto-tracking type CRT display monitor characterized by comprising switching means for changing a value.
JP24033991A 1991-08-28 1991-08-28 Automatic tracking type crt display monitor Pending JPH0553521A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24033991A JPH0553521A (en) 1991-08-28 1991-08-28 Automatic tracking type crt display monitor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24033991A JPH0553521A (en) 1991-08-28 1991-08-28 Automatic tracking type crt display monitor

Publications (1)

Publication Number Publication Date
JPH0553521A true JPH0553521A (en) 1993-03-05

Family

ID=17058018

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24033991A Pending JPH0553521A (en) 1991-08-28 1991-08-28 Automatic tracking type crt display monitor

Country Status (1)

Country Link
JP (1) JPH0553521A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8236345B2 (en) 1999-11-16 2012-08-07 Smithkline Beecham Limited Composition and use

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8236345B2 (en) 1999-11-16 2012-08-07 Smithkline Beecham Limited Composition and use

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