JPH0210701Y2 - - Google Patents
Info
- Publication number
- JPH0210701Y2 JPH0210701Y2 JP1983085060U JP8506083U JPH0210701Y2 JP H0210701 Y2 JPH0210701 Y2 JP H0210701Y2 JP 1983085060 U JP1983085060 U JP 1983085060U JP 8506083 U JP8506083 U JP 8506083U JP H0210701 Y2 JPH0210701 Y2 JP H0210701Y2
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- voltage
- horizontal
- focus
- period
- 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
Links
- 239000003990 capacitor Substances 0.000 claims description 25
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001052 transient effect Effects 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
- H04N3/26—Modifications of scanning arrangements to improve focusing
Description
【考案の詳細な説明】
〔考案の利用分野〕
本考案は、テレビジヨン受像機等におけるブラ
ウン管フオーカス回路に関するものである。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a cathode ray tube focus circuit in a television receiver or the like.
テレビジヨン受像機等のブラウン管に於いて、
最適フオーカス電圧は画面中央部より周辺部に行
くに従つて、高くなつて行くのが普通である。こ
のため、直流のフオーカス電圧に、水平周期、垂
直周期のパラボラ電圧を重畳し、ブラウン管全面
にわたつて、最適フオーカスを得ようとする技術
が考えられている。ここでは、かかる技術をダイ
ナミツクフオーカスと称する。
In cathode ray tubes such as television receivers,
The optimal focus voltage normally increases from the center of the screen toward the periphery. For this reason, a technique has been considered in which a parabolic voltage with a horizontal period and a vertical period is superimposed on a DC focus voltage to obtain the optimum focus over the entire surface of the cathode ray tube. Here, such a technique is referred to as dynamic focus.
ブラウン管は縦横寸法比が３：４であるため、
特に水平方向の周辺部フオーカス劣化が激しく、
これを補正する回路が従来より知られている。 Since the cathode ray tube has an aspect ratio of 3:4,
In particular, the focus deterioration in the peripheral area in the horizontal direction is severe.
Circuits for correcting this are conventionally known.
第１図に、従来の水平方向ダイナミツクフオー
カス回路を示す。 FIG. 1 shows a conventional horizontal dynamic focus circuit.
同図において、１は水平ドライブトランス、２
は水平出力トランジスタ、３はダンパーダイオー
ド、４と５はそれぞれ共振コンデンサ、６は水平
偏向ヨーク、７はＳ字補正コンデンサ、８は電
源、９はフライバツクトランス、１０はブラウン
管、１１は抵抗、１２はフオーカス可変抵抗、１
３は抵抗、１４，１５はそれぞれコンデンサ、１
６は増幅器、１７はトランス、である。 In the same figure, 1 is a horizontal drive transformer, 2
is a horizontal output transistor, 3 is a damper diode, 4 and 5 are each a resonant capacitor, 6 is a horizontal deflection yoke, 7 is an S-shaped correction capacitor, 8 is a power supply, 9 is a flyback transformer, 10 is a cathode ray tube, 11 is a resistor, 12 is the focus variable resistor, 1
3 is a resistor, 14 and 15 are each a capacitor, 1
6 is an amplifier, and 17 is a transformer.
第１図において、Ｓ字補正コンデンサ７から水
平周期のパラボラ電圧のみコンデンサ１５で取り
出す。これを増幅器１６で増幅しトランス１７の
１次側に与える。 In FIG. 1, only the horizontal period parabolic voltage is taken out from the S-shaped correction capacitor 7 by a capacitor 15. This is amplified by an amplifier 16 and applied to the primary side of a transformer 17.
トランス１７で増大、極性反転する。 The transformer 17 increases the voltage and reverses the polarity.
この信号を、コンデンサ１４を通して直流フオ
ーカス電圧に重畳する。 This signal is superimposed on the DC focus voltage through the capacitor 14.
このような従来のフオーカス回路であると、増
幅器１６に高電圧半導体素子が必要になり、又、
トランス１７も高電圧絶縁タイプになる。 Such a conventional focus circuit requires a high voltage semiconductor element for the amplifier 16, and
The transformer 17 also becomes a high voltage insulation type.
以上により、高価な回路になる。 The above results in an expensive circuit.
本考案の目的は、コスト的に廉価な水平方向ダ
イナミツクフオーカス回路を提供することにあ
る。
An object of the present invention is to provide a horizontal dynamic focus circuit that is inexpensive in terms of cost.
上記目的を達成するために、本考案において
は、コンデンサ、コイル、抵抗による振動回路を
作り、この回路に水平帰線期間パルスを導いて水
平周期の振動電圧を発生させ、これを直流フオー
カス電圧に重畳して水平ダイナミツクフオーカス
電圧とするものである。
In order to achieve the above object, the present invention creates an oscillating circuit using a capacitor, a coil, and a resistor, and introduces a horizontal retrace period pulse into this circuit to generate an oscillating voltage with a horizontal period, which is converted into a DC focus voltage. The voltage is superimposed to form a horizontal dynamic focus voltage.
次に図を参照して本考案の一実施例を説明す
る。
Next, an embodiment of the present invention will be described with reference to the drawings.
第２図は本考案の一実施例を示す回路図であ
る。同図において、点線内に示す回路が本考案に
よるダイナミツクフオーカス電圧発生部分であ
る。 FIG. 2 is a circuit diagram showing an embodiment of the present invention. In the figure, the circuit shown within the dotted line is the dynamic focus voltage generating portion according to the present invention.
第３図に、第２図点線内各部電圧波形を示す。
第２図、第３図を参照して以下、詳細に説明す
る。 FIG. 3 shows voltage waveforms at various points within the dotted lines in FIG. 2.
This will be explained in detail below with reference to FIGS. 2 and 3.
共振コンデンサ４，５の間から取り出された水
平帰線期間パルスを、ダイオード２１を通し
て、コンデンサ１８に与える。この信号によりコ
ンデンサ１８はパルス頭まで充電される。 A horizontal blanking period pulse taken out between the resonant capacitors 4 and 5 is applied to the capacitor 18 through the diode 21. This signal charges the capacitor 18 to the beginning of the pulse.
その後、走査期間に於いて、ダイオード２１は
カツトオフされる。充電されたコンデンサ１８の
電荷は、コイル１９、抵抗２０を通して、放電し
はじめる。ここでコイル１９とコンデンサ１８の
時定数は、コイル１９のインダクタンスをＬ、コ
ンデンサ１８のキヤパシタンスをＣ、抵抗２０の
抵抗値をＲとすると、
を満足するように選ばれる。 Thereafter, during the scan period, diode 21 is cut off. The charge in the charged capacitor 18 begins to be discharged through the coil 19 and the resistor 20. Here, the time constants of the coil 19 and capacitor 18 are as follows, assuming that the inductance of the coil 19 is L, the capacitance of the capacitor 18 is C, and the resistance value of the resistor 20 is R. selected to satisfy the following.
また、上記式から振動周波数（共振周波数）H
はほぼ15.734kHzに選択されるの良い。 Also, from the above formula, the vibration frequency (resonant frequency) H
A good choice is approximately 15.734kHz.
このようにコンデデンサ１８、コイル１９、抵
抗２０で構成された閉回路すなわち共振回路のコ
イル１９のインダクタンスＬ、コンデンサ１８の
キヤパシタンスＣ、抵抗２０の抵抗値Ｒを選択す
ることにより共振回路は過渡現象によつて共振
し、ダイオード２１を介して水平帰線期間に供給
される正極性パルスの電圧をピーク電圧とし、波
形が正弦波波形にほぼ等しく、周期が１水平周期
の振動電圧が出力される。第３図にこの信号の
波形を示す。このよう共振回路から出力される信
号はほぼ正弦波であり、パラボラ信号と波形がほ
ぼ等しいのでこの信号を疑似パラボラ電圧と見な
して、コンデンサ１４を通じて、フオーカス電圧
に重畳すれば従来例と同様のダイナミツクフオー
カスが行なえる。 In this way, by selecting the inductance L of the coil 19, the capacitance C of the capacitor 18, and the resistance value R of the resistor 20 of the closed circuit, that is, the resonant circuit composed of the capacitor 18, the coil 19, and the resistor 20, the resonant circuit can be made to withstand transient phenomena. Therefore, it resonates, and the peak voltage is the voltage of the positive pulse supplied through the diode 21 during the horizontal retrace period, and an oscillating voltage having a waveform substantially equal to a sine wave waveform and a period of one horizontal period is output. FIG. 3 shows the waveform of this signal. The signal output from such a resonant circuit is almost a sine wave, and the waveform is almost the same as that of the parabolic signal. Therefore, if this signal is regarded as a pseudo-parabolic voltage and is superimposed on the focus voltage through the capacitor 14, it can be used as a dynamometer similar to the conventional example. Mitsuku focus can be performed.
本考案によれば、水平帰線期間パルス電圧を大
きくすれば簡単に大きな疑似パラボラ電圧が得ら
れ、高価な半導体素子、トランスが不必要にな
り、ダイナミツクフオーカス回路を廉価に構成出
来る。
According to the present invention, a large pseudo-parabolic voltage can be easily obtained by increasing the pulse voltage during the horizontal retrace period, and expensive semiconductor elements and transformers are no longer necessary, allowing a dynamic focus circuit to be constructed at low cost.
第１図は従来の水平方向ダイナミツクフオーカ
ス回路を示す回路図、第２図は本考案の一実施例
を示す回路図、第３図は第２図の回路における要
部の電圧波形を示す波形図、である。
符号説明、１……水平ドライブトランス、２…
…水平出力トランジスタ、３……ダンパーダイオ
ード、４……共振コンデンサ、５……共振コンデ
ンサ、６……水平偏向ヨーク、７……Ｓ字補正コ
ンデンサ、８……電源、９……フライバツクトラ
ンス、１０……ブラウン管、１１……抵抗、１２
……フオーカスVR、１３……抵抗、１４……コ
ンデンサ、１５……コンデンサ、１６……増幅
器、１７……トランス、１８……コンデンサ、１
９……コイル、２０……抵抗、２１……ダイオー
ド。
Fig. 1 is a circuit diagram showing a conventional horizontal dynamic focus circuit, Fig. 2 is a circuit diagram showing an embodiment of the present invention, and Fig. 3 shows voltage waveforms of important parts of the circuit shown in Fig. 2. This is a waveform diagram. Code explanation, 1...Horizontal drive transformer, 2...
... Horizontal output transistor, 3 ... Damper diode, 4 ... Resonance capacitor, 5 ... Resonance capacitor, 6 ... Horizontal deflection yoke, 7 ... S-shaped correction capacitor, 8 ... Power supply, 9 ... Flyback transformer, 10... Braun tube, 11... Resistor, 12
...Focus VR, 13...Resistor, 14...Capacitor, 15...Capacitor, 16...Amplifier, 17...Transformer, 18...Capacitor, 1
9...Coil, 20...Resistor, 21...Diode.
Claims (1)
ードを介して入力され、 出力端に該正極性パルスの電圧をピーク電圧と
し、波形が正弦波波形にほぼ等しく、周期が１水
平周期の振動電圧を出力する、 コイル、コンデンサおよび抵抗からなる共振回
路と： 該共振回路の出力端に接続されたコンデンサ：
を備え、該コンデンサを介して、該共振回路の出
力を直流フオーカス電圧に重畳したことを特徴と
するブラウン管フオーカス回路。[Claims for Utility Model Registration] A positive pulse is input to the input terminal through a diode during the horizontal retrace period, the voltage of the positive pulse is the peak voltage at the output terminal, and the waveform is approximately equal to a sine wave waveform, A resonant circuit consisting of a coil, a capacitor, and a resistor that outputs an oscillating voltage with a period of one horizontal period: A capacitor connected to the output end of the resonant circuit:
A cathode ray tube focus circuit characterized in that the output of the resonant circuit is superimposed on a DC focus voltage via the capacitor.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1983085060U JPS59193062U (en) | 1983-06-06 | 1983-06-06 | CRT focus circuit |
| KR2019840005294U KR900008166Y1 (en) | 1983-06-06 | 1984-06-04 | Focusing tube for brown tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1983085060U JPS59193062U (en) | 1983-06-06 | 1983-06-06 | CRT focus circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59193062U JPS59193062U (en) | 1984-12-21 |
| JPH0210701Y2 true JPH0210701Y2 (en) | 1990-03-16 |
Family
ID=30215023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1983085060U Granted JPS59193062U (en) | 1983-06-06 | 1983-06-06 | CRT focus circuit |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS59193062U (en) |
| KR (1) | KR900008166Y1 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5912848Y2 (en) * | 1979-05-11 | 1984-04-17 | 三菱電機株式会社 | Dynamic focus device |
-
1983
- 1983-06-06 JP JP1983085060U patent/JPS59193062U/en active Granted
-
1984
- 1984-06-04 KR KR2019840005294U patent/KR900008166Y1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR850008147U (en) | 1985-10-26 |
| JPS59193062U (en) | 1984-12-21 |
| KR900008166Y1 (en) | 1990-09-03 |
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