JPS6012873A - Correcting circuit of black level of television receiver - Google Patents
Correcting circuit of black level of television receiverInfo
- Publication number
- JPS6012873A JPS6012873A JP58118325A JP11832583A JPS6012873A JP S6012873 A JPS6012873 A JP S6012873A JP 58118325 A JP58118325 A JP 58118325A JP 11832583 A JP11832583 A JP 11832583A JP S6012873 A JPS6012873 A JP S6012873A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- circuit
- black level
- high voltage
- screen
- 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
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
- H04N5/165—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level to maintain the black level constant
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Picture Signal Circuits (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、テレビジョン受信機において、ブラウン管ア
ノード電圧を安定化する高圧安定化回路の動作により、
フライバックトランス帰線パルス波形が変化してもこれ
を補償する手段を備え、スクリーン電圧を一定に保つこ
とにより黒レベルを安定化する黒レベル補正回路に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention provides a television receiver that uses a high-voltage stabilizing circuit to stabilize the cathode ray tube anode voltage.
This invention relates to a black level correction circuit that includes means for compensating for changes in flyback transformer retrace pulse waveforms and stabilizes the black level by keeping the screen voltage constant.
テレビジョン受信機のブラウン管に印加するアノード高
圧（以下高圧と呼ぶ）は、水平出力トランジスタで駆動
されるフライバックトランス（以下ＦＢＴと呼ぶ）の高
圧巻線よシ得ている。一般にＦＢＴはレギュレーション
特性があるため、ブラウン管に流れるビーム電流が変化
すると高圧か変動する。この高圧変動は従来のテレビジ
ョン受信機では無視されることが多かったが、近年、高
画質化テレビの市＃Ｊ要求によシ、これらのテレビにお
いてビーム電流が変化しても高圧を一足に保つための高
圧安定化回路が採用されるようになった。また、投写形
プロジェクションテレビにおいては、その光学的原理か
ら十分なスクリーン上の明るさおよび良好なフォーカヌ
特性を得るためにはブラウン管の高圧を高く設定する必
要があるが、ブラウン管よ）照射されるＸ線の量を規制
するために高圧の安定化が行なわれている。第１図にが
がる従来の高圧安定化回路の例を示す。The anode high voltage (hereinafter referred to as high voltage) applied to the cathode ray tube of a television receiver is obtained from the high voltage winding of a flyback transformer (hereinafter referred to as FBT) driven by a horizontal output transistor. Generally, FBTs have regulation characteristics, so if the beam current flowing through the cathode ray tube changes, the high voltage will fluctuate. This high voltage fluctuation was often ignored in conventional television receivers, but in recent years, in response to the city's demand for high-definition televisions, these televisions have been able to maintain high voltage even when the beam current changes. A high-voltage stabilization circuit was adopted to maintain the In addition, in projection televisions, it is necessary to set the high voltage of the cathode ray tube high in order to obtain sufficient brightness on the screen and good focus characteristics due to its optical principle. High voltage stabilization is used to control the amount of wire. FIG. 1 shows an example of a conventional high voltage stabilizing circuit.
同図において、１はＦＢＴ、２は水平出力回路・６はヌ
クリーン電圧供給回路、４は高圧安定回路、５は水平出
方回路駆動電源、６？オ水平出力トランジスタペ一ス入
カ信号、７は水平出力トランジスタ、８はダンパーダイ
オード、９は８字補正コンデンサ、ＩＱは水平偏向コイ
ル。In the figure, 1 is an FBT, 2 is a horizontal output circuit, 6 is a clean voltage supply circuit, 4 is a high voltage stabilizing circuit, 5 is a horizontal output circuit drive power supply, and 6? 7 is a horizontal output transistor, 8 is a damper diode, 9 is a figure-8 correction capacitor, and IQ is a horizontal deflection coil.
１１ 、１２はそれぞわ共振コンデンサ、１３は高圧整
流ダイオード、１４は帰馴パルス整流ダイオード。11 and 12 are resonant capacitors, 13 is a high-voltage rectifier diode, and 14 is a recirculating pulse rectifier diode.
１５は抵抗、１６は帰線パルヌ平ｆ＃コンデンサ、１７
Ｉはスクリーン電圧、１８はアノード高圧、１９は高圧
検出回路、 ２０ 、２１はそれぞれダイオード、２２
は共振コンデンサの等価容量可変用コンデンサ１２３は
抵抗、２４は高圧安定用レギュレータトランジスタ、２
５は帰線パルスである。15 is a resistor, 16 is a retrace Parnu flat f# capacitor, 17
I is a screen voltage, 18 is an anode high voltage, 19 is a high voltage detection circuit, 20 and 21 are diodes, 22
is a capacitor 123 for variable equivalent capacitance of a resonant capacitor, a resistor, 24 a regulator transistor for high voltage stabilization, and 2
5 is a retrace pulse.
なお、第１図に示した高圧安定化回路の動作については
後に簡単に説明する。Note that the operation of the high voltage stabilizing circuit shown in FIG. 1 will be briefly explained later.
これらの高画質テレビ、投写形プロジェクションテレビ
における高圧安定化回路はブラウン管の高圧変動を検知
し、この検知信号で水平出力回路の動作条件（例えば共
振コンデンサの等価容量）を変えることによシ高圧の安
定動作を行なって−る。このため高圧の安定化を行なう
とＦＢＴ（７）Ｍｌパルスの波形（パルス幅、パルスビ
ーク電圧値）が変わるという現象が生ずる第２図にその
略図を示す。The high-voltage stabilizing circuits in these high-definition televisions and projection televisions detect high-voltage fluctuations in the cathode ray tube, and use this detection signal to change the operating conditions of the horizontal output circuit (e.g., the equivalent capacitance of a resonant capacitor). It is operating stably. For this reason, when the high voltage is stabilized, a phenomenon occurs in which the waveform (pulse width, pulse peak voltage value) of the FBT(7) Ml pulse changes.A schematic diagram thereof is shown in FIG.
同図にお込て、２５は帰線パルス、２６は帰線期間Ｔｒ
＋ ２７は水平走査期間Ｔｓ ＋ ２８は水平発振周
期（１）１）、２９は帰線パルスピーク電圧Ｖｃｐ、５
０は高圧安定化時の帰線パルス波形例である。In the figure, 25 is a retrace pulse, and 26 is a retrace period Tr.
+ 27 is the horizontal scanning period Ts + 28 is the horizontal oscillation period (1) 1), 29 is the retrace pulse peak voltage Vcp, 5
0 is an example of the retrace pulse waveform at the time of high voltage stabilization.
ところで、ブラウン管に印加するスクリーン電圧は、Ｆ
ＢＴの帰線パルスを整流、平滑して得ている。このため
上記高圧安定化回路を付加するとブラウン管のビーム電
流変動によってスクリーン電圧が変動するという幣害を
生ずる。By the way, the screen voltage applied to the cathode ray tube is F
It is obtained by rectifying and smoothing the retrace pulse of BT. For this reason, adding the above-mentioned high-voltage stabilizing circuit causes a problem in that the screen voltage fluctuates due to fluctuations in the beam current of the cathode ray tube.
これは画面上で黒レベル変動となって現われる。This appears as black level fluctuations on the screen.
これを防止するための方法としては、水平出力回路およ
びＦＢＴを２組備え、第１の水平出方回路、ＦＢＴは高
圧発生専用として使用し、高圧安定化回路で高圧制御を
行ない、第２の水平出力回路、ＦＢＴよりスクリーン電
圧、その細巾低電圧を得ることに上り、上記ヌク１１−
ン電圧変動に起因する黒レベル変動を防止している。To prevent this, two sets of horizontal output circuits and FBTs are provided, the first horizontal output circuit and FBT are used exclusively for high voltage generation, the high voltage stabilization circuit performs high voltage control, and the second The horizontal output circuit obtains a screen voltage from the FBT and its narrow width low voltage, and the above Nuku 11-
This prevents black level fluctuations caused by voltage fluctuations.
しかし、この方法では水平出力回路およびＦＢＴが２組
ずつ必要であシ非常にコスト高となシまた、セット実装
面からも不利である。第３図にこのブロック図を示す。However, this method requires two sets of horizontal output circuits and two sets of FBTs, resulting in very high costs and is also disadvantageous in terms of set mounting. FIG. 3 shows this block diagram.
同図において、１はＦＢＴ、２は水平出力回路、３はス
クリーン電圧供給回路、４は高圧安定回路、５は水平出
力回路駆動電源、６は水平出力トランジスタベース入力
信号、１３は高圧整流ダイオード、１７はスクリーン電
圧、１８はアノード高圧である。In the figure, 1 is an FBT, 2 is a horizontal output circuit, 3 is a screen voltage supply circuit, 4 is a high voltage stabilizing circuit, 5 is a horizontal output circuit driving power supply, 6 is a horizontal output transistor base input signal, 13 is a high voltage rectifier diode, 17 is a screen voltage, and 18 is an anode high voltage.
このため水平出力回路、ＦＢＴを２組使用することなく
、帰線パルスの波形変化に起因する黒レベル変動を抑え
る新しい回路方式の考案が必要となった。Therefore, it became necessary to devise a new circuit system that suppresses black level fluctuations caused by changes in the waveform of the retrace pulse without using two sets of horizontal output circuits and FBTs.
なお、従来知られて込る黒レベル補正回路は受信チャン
ネルごとに異なる送信側での黒レベルを受信機内部で補
正するものであるから上述したＦＢＴ帰線パルス波形の
変化に起因する黒レベルの変動は防止できな込。この従
来方式の黒レベル補正回路は公知の事項であるため説明
は省略する。It should be noted that the conventionally known black level correction circuit corrects the black level on the transmitting side, which differs for each receiving channel, within the receiver, so it is possible to correct the black level due to the change in the FBT retrace pulse waveform mentioned above. Changes cannot be prevented. Since this conventional black level correction circuit is well known, its explanation will be omitted.
本発明の目的は、水平出力回路やＦＢＴを２組使用する
ことなく、高圧安定化回路動作時のｈ線パルｘ波形変化
に起因するｌＩ！１１面黒レベルノし動を防止すること
のできる黒レベル補正回路を提供することにある。An object of the present invention is to eliminate lI! due to changes in the h-line pulse x waveform during operation of a high-voltage stabilizing circuit without using a horizontal output circuit or two sets of FBTs. An object of the present invention is to provide a black level correction circuit capable of preventing black level fluctuation on 11 surfaces.
本発明では、水平出力回路の共振コンデンザ等価容量可
変形の高圧安定化回路を倫えたテレビジョン受信機にお
いて、上記安定化回路の出方トランジスタに直列に接続
された抵抗の両端に生ずる電圧変化分を肱来方式のスク
リーン電圧供給回路に加算することにょシ、高圧安定化
回路付加に伴なうスクリーン電圧変動を防止し、黒レベ
ルの安定化を計シ、上述した目的を達成している。In the present invention, in a television receiver equipped with a high-voltage stabilizing circuit having a variable equivalent capacitance of a resonant capacitor in a horizontal output circuit, the voltage change occurring across a resistor connected in series with the output transistor of the stabilizing circuit is By adding this to the conventional screen voltage supply circuit, the screen voltage fluctuations caused by the addition of the high-voltage stabilizing circuit are prevented, and the black level is stabilized, thereby achieving the above-mentioned purpose.
以下、本発明の詳細な説明するが、それに先立ち第１図
、第２図を参照して従来回路の動作を簡単に説明する。The present invention will be described in detail below, but prior to that, the operation of the conventional circuit will be briefly explained with reference to FIGS. 1 and 2.
第１図は高圧安定化回路の一例であシ、高圧安定化出力
トランジスタ２４に流れる電流を制御することによシ、
コンデンサ１１とコンデンサ１２の合成等価容量を変化
させ、閉ループによる高圧安定動作を行なっている。水
平出力トランジスタ７の導通、非導通にょシ第２図に示
す帰線パルス２５が発生するが、ブラウン管のビーム電
流３５が減少し、高圧１Ｂが上昇した場合にはトランジ
スタ２４に流れる電流が増加し、コンデンサ１１とコン
デンサ１２の合成等価容量が大きくなる水平出力回路駆
動電源５の電圧をＶ、コンデンサ１１および１２の合成
等価容量をＣ２水平偏向コイル１０のインダクタンスを
り、水平走査期間２７をＴｓ ｒアノード高圧１８をＥ
Ｈとすれば、これらの間には近似的に次の関係が成立つ
。FIG. 1 is an example of a high voltage stabilizing circuit, which can be used by controlling the current flowing through the high voltage stabilizing output transistor 24.
By changing the combined equivalent capacitance of capacitor 11 and capacitor 12, stable high voltage operation is achieved through a closed loop. When the horizontal output transistor 7 becomes conductive or non-conductive, a retrace pulse 25 shown in FIG. 2 is generated, but when the beam current 35 of the cathode ray tube decreases and the high voltage 1B increases, the current flowing through the transistor 24 increases. , the voltage of the horizontal output circuit driving power supply 5 where the combined equivalent capacitance of the capacitors 11 and 12 increases is V, the combined equivalent capacitance of the capacitors 11 and 12 is C2, the inductance of the horizontal deflection coil 10 is Ts r, and the horizontal scanning period 27 is Ts r E anode high pressure 18
If H, then the following relationship approximately holds true between these.
従って、高圧１８が上昇した場合には、高圧安定化回路
４により共振コンデンサの等価容量を大きくすれば高圧
１８が安定化される。このとき帰線パルスの波形は第２
図の破Ｉｖｌｉ！３０で示したようになり、この結果帰
線パルスを整流平滑した電圧が変化するためスクリーン
電圧１７が変化し黒レベル変動となる。Therefore, when the high voltage 18 increases, the high voltage stabilizing circuit 4 increases the equivalent capacitance of the resonant capacitor, thereby stabilizing the high voltage 18. At this time, the waveform of the retrace pulse is
Diagram of destruction! As a result, the voltage obtained by rectifying and smoothing the retrace pulse changes, so that the screen voltage 17 changes, resulting in black level fluctuation.
第４図に本発明による黒レベル補正回路の具体的実施例
を示す。以下、第４図、第５図により本考案の回路動作
を説明する。FIG. 4 shows a specific embodiment of the black level correction circuit according to the present invention. Hereinafter, the circuit operation of the present invention will be explained with reference to FIGS. 4 and 5.
第１図と第４図では、コンデンサ１６の接続方法のみが
異なっている。高圧安定化回路４のトランジスタ２４の
コレクタ電流３１は、今までの説明で明らかなように、
ブラウン管ビーム亀流易が小さくなる程増大する。従っ
て、ビーム電流３６の小さい領域においてはトランジス
タ２４に直列に接続された抵抗２５の両端に生ずる電圧
降下５２は大きくなる。1 and 4 differ only in the way the capacitor 16 is connected. As is clear from the above explanation, the collector current 31 of the transistor 24 of the high voltage stabilizing circuit 4 is
It increases as the cathode ray tube beam flux becomes smaller. Therefore, in a region where the beam current 36 is small, the voltage drop 52 occurring across the resistor 25 connected in series with the transistor 24 becomes large.
ところで、第１図に示す従来の回路では、高圧安定化回
路４によってＦＢＴの帰線パルス波形が２５からＳＯの
ように変化するため、スクリーン電圧１７とブラウン管
ビーム電流３５の関係は、第５図に破線で示したように
なっている。ところが、本発明ではスクリーン電圧３４
は、前述した抵抗２３の両端電圧５２が加算されるため
、トランジスタ２４のコレクタ電流３１．直列抵抗２３
の値を最適に選ぶことによ！Ｄ、ＦＢＴの帰線パルス波
形変動に伴なうスクリーン電圧変化を相殺することがで
き、スクリーン電圧５４を安定化できる。この結果、画
面の黒レベルを常に一定に保つことが可能となり、本発
明の目的が達成された。By the way, in the conventional circuit shown in FIG. 1, the FBT retrace pulse waveform changes from 25 to SO by the high voltage stabilizing circuit 4, so the relationship between the screen voltage 17 and the cathode ray tube beam current 35 is as shown in FIG. as shown by the broken line. However, in the present invention, the screen voltage 34
Since the voltage 52 across the resistor 23 mentioned above is added, the collector current 31 . of the transistor 24 is increased. Series resistance 23
By optimally choosing the value of! D. Changes in the screen voltage due to fluctuations in the retrace pulse waveform of the FBT can be offset, and the screen voltage 54 can be stabilized. As a result, it became possible to always keep the black level of the screen constant, and the object of the present invention was achieved.
以上のように、本発明によれば高圧安定化回路が動作し
、帰線パルスの波形が変化しても、スクリーン電圧は一
定になるよう補正されるため、ブラウン管ビーム電流の
大きさによらず画面の黒レベルが一定に保たれ、テレビ
ジョン受信機の画質が向上するという効果がある。As described above, according to the present invention, the high voltage stabilizing circuit operates and the screen voltage is corrected to be constant even if the waveform of the retrace pulse changes, regardless of the magnitude of the cathode ray tube beam current. This has the effect of keeping the black level of the screen constant and improving the image quality of the television receiver.
本発明によれば、帰線パルスの波形変化によりスクリー
ン電圧に変動があっても、スクリーン電圧に高圧安定化
回路よりの補正電圧が加算され、ヌクｌ−ン電圧変動が
補正される。このため、テレビジョン受信機の黒レベル
を一定に保つことができ、画質性能の向上が可能になる
また、水平出力回路、ＦＢＴは一組で良く、二組用いた
方式よシもコスト、セット実装面において有利である。According to the present invention, even if the screen voltage fluctuates due to a change in the waveform of the retrace pulse, a correction voltage from the high-voltage stabilizing circuit is added to the screen voltage, and the null voltage fluctuation is corrected. Therefore, the black level of the television receiver can be kept constant, and the image quality performance can be improved.In addition, only one set of horizontal output circuit and FBT is required, and the cost and set-up are lower than the system using two sets. This is advantageous in terms of implementation.
第１図はテレビジョン受信機における従来の高圧安定化
回路を示す回路図、第２図は烏圧安定化動作時における
水平帰線パルス波形を示す波形図、第３図は黒レベル変
動防止のため二組のＦＢＴと水平出力回路を用いた従来
例を示すブロック図、第４図は本発明の具体的一実施例
を示す回路図、第５図は第４図の回路におはる要部の電
圧と電流の関係を示すグラフである。
１・・・ＦＢＴ、 ２・・・水平出力回路、３・・・ス
クリーン電圧供給回路、
４・・・高圧安定回路、
５・・・水平出力回路駆動電源、
６・・・水平出力トランジスタベース入力信号、７・・
・水平出力トランジスタ、
８・・・ダンパーダイオード、
９・・・８字補正コンデンサ、
１０・・・水平偏向コイル、１１・・・共振コンデンサ
、１２・・・共振コンデンサ、１３・・・高圧整流ダイ
オード１４・・・帰線パルス整流ダイオード、１５・・
・抵抗、
１６・・・帰線パルス平滑コンデンサ、１７・・・スク
リーン電圧、１８・・・アノード高圧、１９・・・高圧
検出回路、 ２０・・・ダイオード、２１・・・ダイオ
ード、
２２・・・共振コンデンサの等価容量可変用コンデンサ
、２３・・・抵抗、
２４・・・高圧安定用レギュレータトランジスタ、２５
・・・帰線パルス、２６・・・帰線期間、２７・・・水
平走査期間、 ２８・・・水平発振周期、２９・・・帰
線パルスピーク電圧、
３０・・・高圧安定化時の帰線パルス波形例、６１・・
・トランジスタ２４のコレクタ電流、３２・・・抵抗２
３の両端電圧、
３３・・・ブラウン管高圧ビームー流、６４・・・補正
されたスフ１１−ン電圧。
第１図
埠 ４ 図
第 ５ｆｆｉ
ツア
ーＩＢＥＡｔ′１
ブ
３Figure 1 is a circuit diagram showing a conventional high-voltage stabilization circuit in a television receiver, Figure 2 is a waveform diagram showing the horizontal retrace pulse waveform during the pressure stabilization operation, and Figure 3 is a waveform diagram showing the waveform of the horizontal retrace pulse during the pressure stabilization operation. 4 is a block diagram showing a conventional example using two sets of FBTs and a horizontal output circuit, FIG. 4 is a circuit diagram showing a specific embodiment of the present invention, and FIG. FIG. 1...FBT, 2...Horizontal output circuit, 3...Screen voltage supply circuit, 4...High voltage stabilization circuit, 5...Horizontal output circuit drive power supply, 6...Horizontal output transistor base input Signal, 7...
・Horizontal output transistor, 8... Damper diode, 9... Figure 8 correction capacitor, 10... Horizontal deflection coil, 11... Resonance capacitor, 12... Resonance capacitor, 13... High voltage rectifier diode 14... Retrace pulse rectifier diode, 15...
・Resistance, 16... Retrace pulse smoothing capacitor, 17... Screen voltage, 18... Anode high voltage, 19... High voltage detection circuit, 20... Diode, 21... Diode, 22...・Capacitor for variable equivalent capacitance of resonance capacitor, 23...Resistor, 24...Regulator transistor for high voltage stabilization, 25
...Retrace line pulse, 26...Retrace line period, 27...Horizontal scanning period, 28...Horizontal oscillation period, 29...Retrace line pulse peak voltage, 30...During high voltage stabilization Retrace pulse waveform example, 61...
・Collector current of transistor 24, 32...resistance 2
Voltage across 3, 33... Braun tube high-pressure beam current, 64... Corrected beam voltage. Figure 1 Pier 4 Figure 5ffi Tour IBE At'1 Bu 3
Claims (1)
クリーン電圧を得ている一テレビジョン受信機において
、その水平出力回路における共振コンデンサの等価容量
を可変してブラウン管アノード高圧を安定化する高圧安
定化回路を備えると共に、該安定化回路の出力トランジ
スタに直列に接続された抵抗両端に生ずる電圧変化によ
シ、フライバックトランスの帰線パルス波形変化に起因
するスクリーン電圧の変動を補正してスクリーン電圧を
一定に保つことによシ、黒レベルを安定化することを特
徴とするテレビジョン受信機の黒レベル補正回路。1. In a television receiver that obtains the screen voltage by rectifying the retrace pulse of a flyback transformer, high voltage stabilization stabilizes the high voltage at the cathode ray tube anode by varying the equivalent capacitance of the resonant capacitor in the horizontal output circuit. The screen voltage is adjusted by correcting the screen voltage fluctuation caused by the retrace pulse waveform change of the flyback transformer by the voltage change occurring across the resistor connected in series with the output transistor of the stabilizing circuit. A black level correction circuit for a television receiver, which is characterized by stabilizing the black level by keeping the black level constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58118325A JPS6012873A (en) | 1983-07-01 | 1983-07-01 | Correcting circuit of black level of television receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58118325A JPS6012873A (en) | 1983-07-01 | 1983-07-01 | Correcting circuit of black level of television receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6012873A true JPS6012873A (en) | 1985-01-23 |
Family
ID=14733873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58118325A Pending JPS6012873A (en) | 1983-07-01 | 1983-07-01 | Correcting circuit of black level of television receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6012873A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03159561A (en) * | 1989-09-29 | 1991-07-09 | Siemens Ag | Switching regulator circuit device |
| US5619285A (en) * | 1994-07-13 | 1997-04-08 | Mitsubishi Denki Kabushiki Kaisha | CRT drive circuit |
-
1983
- 1983-07-01 JP JP58118325A patent/JPS6012873A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03159561A (en) * | 1989-09-29 | 1991-07-09 | Siemens Ag | Switching regulator circuit device |
| US5619285A (en) * | 1994-07-13 | 1997-04-08 | Mitsubishi Denki Kabushiki Kaisha | CRT drive circuit |
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