JPS58225780A - Preventing circuit for ion spot of cathode-ray tube - Google Patents
Preventing circuit for ion spot of cathode-ray tubeInfo
- Publication number
- JPS58225780A JPS58225780A JP10805982A JP10805982A JPS58225780A JP S58225780 A JPS58225780 A JP S58225780A JP 10805982 A JP10805982 A JP 10805982A JP 10805982 A JP10805982 A JP 10805982A JP S58225780 A JPS58225780 A JP S58225780A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- ray tube
- relay
- power source
- turned
- 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
- H04N3/20—Prevention of damage to cathode-ray tubes in the event of failure of scanning
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】
〔発明の技術分野〕
本発明は、陰極線管を使用した表示器全般において、通
常の電源スィッチのオン、オフ時、!ランキング電圧異
常時、ま友はその他の電源異常時に陰極線管のイオン焼
を防止する回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention provides general display devices using cathode ray tubes, when a normal power switch is turned on and off. Mayu relates to a circuit that prevents ion burning in cathode ray tubes when there is a ranking voltage abnormality or other power supply abnormalities.
一般に、陰極線管を使用した表示器の電源をオンの状態
からオフにする場合に、陰極線管上で偏向されていた電
子ビームは電源オフの瞬間に偏向エネルギがなくなるの
で、陰極線管の中心に集中し、陰極線管の中心にスポッ
ト状の輝度を残し、陰極線管中心付近にイオン焼けを発
生する。これは電源がオフになったにもかかわらず、陰
極線管そのもののコンデンサ特性によりチャージされて
いた高圧が完全にディスチャーゾするまでに多少時間が
かかるのと、陰極線管のグリッドに加えているブランキ
ング電圧が電源スイツチオンと同時にグリッドに印加さ
れなくなシ零電位になるために、陰極線管の中心部に電
子ビームが集中し、スポットを形成するためである。Generally, when turning off the power of a display device that uses a cathode ray tube, the electron beam that was deflected on the cathode ray tube loses its deflection energy the moment the power is turned off, so it concentrates at the center of the cathode ray tube. However, a spot-like brightness remains in the center of the cathode ray tube, and ion burn occurs near the center of the cathode ray tube. This is because even though the power is turned off, it takes some time for the charged high voltage to be completely discharged due to the capacitor characteristics of the cathode ray tube itself, and the blanking voltage applied to the cathode ray tube grid. This is because the voltage is no longer applied to the grid at the same time as the power switch is turned on and the potential becomes zero, so the electron beam concentrates at the center of the cathode ray tube and forms a spot.
このような問題を解決する方法としては次のような方式
があった。The following methods were used to solve this problem.
■ スイッチオンの瞬間隘極線管面外に電子ビームを飛
ばす方式。■ A method that sends an electron beam out of the polar ray tube at the moment the switch is turned on.
■ 遅延リレーを使用したリレーシーケンス回路を用い
る方式。■ A method using a relay sequence circuit using delay relays.
即ち、■の方式はスイッチオンと同時に、偏向コイルに
直流あるいは交流電圧を切換えることにより、電子ビー
ムを陰極線管の前面外に偏向して高圧がディスチャージ
する期間イオン焼けを防止する方式であるが、別電源を
必要とし、偏向コイルにかなりの電流を流す必要性があ
ることから電流容量的に回路構成が大きくなる欠点を有
する。また、上記■の方式は数秒の遅延量をリレーを使
用して、スイッチオフと同時に高圧の入力を切シ遅延リ
レーで数秒遅らせてからブランキング電圧をオフにする
りレージ−ケンス回路である。この方式は電源に異常が
発生しブランキング用電圧が異常になった場合にはこの
リレーシーケンス動作は全くくずれるため、リレーシー
ケンスによる回路を形成するには付加回路が必要となり
複雑になる欠点がある。That is, the method (2) is a method in which the electron beam is deflected to the outside of the front of the cathode ray tube by switching the DC or AC voltage to the deflection coil at the same time as the switch is turned on, thereby preventing ion burnout during the high voltage discharge period. This method requires a separate power source and requires a considerable amount of current to flow through the deflection coil, which has the disadvantage that the circuit configuration becomes large in terms of current capacity. Further, the method (2) above uses a relay with a delay of several seconds to turn off the high voltage input at the same time as the switch is turned off, and then uses a delay relay to delay the blanking voltage for several seconds and then turns off the blanking voltage. In this method, if an abnormality occurs in the power supply and the blanking voltage becomes abnormal, this relay sequence operation will completely break down, so forming a relay sequence circuit requires an additional circuit and becomes complicated. .
本発明は上記の事情に鑑みてなされたもので、部品点数
が少なく簡単な回路で構成し得、かつ電源オン、オフ時
に確実にビデオ信号を切ってから高圧電源を切り、隘極
線管残留特性による電圧が消滅するまでブランキング電
圧とOR時定数団回路保持することによシ、陰極線管の
イオン焼けを防止し得、更にブランキング電圧異常時あ
るいはその他の低電圧電源回路異常時でも陰極線管のイ
オン焼けを防止し得る陰極線管のイオン焼は防止回路を
提供することを目的とする。The present invention has been made in view of the above circumstances, and can be configured with a simple circuit with a small number of parts, and can reliably turn off the video signal and then turn off the high-voltage power supply when the power is turned on and off, thereby preventing the remaining electrode ray tube from remaining. By maintaining the blanking voltage and OR time constant group circuit until the characteristic voltage disappears, it is possible to prevent ion burnout of the cathode ray tube, and furthermore, even when the blanking voltage is abnormal or other low-voltage power supply circuit abnormalities occur, the cathode ray remains unchanged. It is an object of the present invention to provide a cathode ray tube ion burnout prevention circuit capable of preventing ion burnout of the tube.
本発明は、ビデオ増幅回路の出力側を切る回路と、ビデ
オ増幅回路の負荷抵抗を通してブランキング電圧を数秒
間陰極線管に供給できるようにした〇R時定数回路と、
陰極線管の高圧電源の供給回路で構成され、通常使用時
の電源スイツチオン、オフ時はもちろん、電源回路に異
常があわ、ブランキング電圧及びその他の電圧に異常が
あった場合でもビデオ信号を切って高圧の入力電圧をオ
フにしてから、あらかじめ正常動作時に印加していたブ
ランキング電圧を印加し続ける簡単なCR時定数回路を
必要な時間に作動させるものである。The present invention includes a circuit that cuts off the output side of a video amplifier circuit, an 〇R time constant circuit that can supply a blanking voltage to a cathode ray tube for several seconds through a load resistor of the video amplifier circuit,
Consists of the high-voltage power supply circuit for cathode ray tubes, and not only when the power switch is turned on and off during normal use, but also when there is an abnormality in the power circuit, blanking voltage, or other voltage abnormalities, the video signal is turned off. After turning off the high-voltage input voltage, a simple CR time constant circuit that continues to apply the blanking voltage that was previously applied during normal operation is activated at the required time.
以下図面を参照して本発明の実施例を詳細に説明する。 Embodiments of the present invention will be described in detail below with reference to the drawings.
即ち、第1図において、ビデオ信号の入力端1を有する
ビデオ増幅回路2の出力端には電源オンオフスイッチ3
及びリレー4の接点5を直列に介して陰極線管6のグリ
ッド7が接続される。このグリッド7はビデオ増幅回路
2の負荷抵抗8を介してダイオード9のアノードに接続
され、このダイオード90カソードは抵抗10及びリレ
ー11を直列に介して接地される。前記ダイオード9の
アノードはCB時定数回路12のコンデンサ13を介し
て接地されると共に抵抗14を介して前記ダイオード9
0カッ−げに接続され、このダイオード9のカソードは
低圧電源15のブランキング用負直流電圧出力端に接続
される。前記低圧電源15と交流または直流入力端16
との間にはリレー4の接点17が介挿接続される。前記
低圧電源15には前記リレー4及び電源オンオフスイッ
チ18を直列に介してリレー駆動電圧印加端19に接続
される。又、前記低圧電源15にはその他の直流出力端
2o、xxが設けられると共に、前記リレー11の接点
22を介して高圧電源23の直流入力端に接続され、こ
の高圧電源23の出力端は陰極線管6のアノード端子2
4に接続される。前記電源オンオフスイッチ18と3は
連動し、スイッチ3の1回路分はビデオ信号の入力側を
オンオフにするための回路に利用する。That is, in FIG. 1, a power on/off switch 3 is provided at the output end of a video amplifier circuit 2 having an input end 1 for a video signal.
The grid 7 of the cathode ray tube 6 is connected via the contact 5 of the relay 4 in series. This grid 7 is connected to the anode of a diode 9 via a load resistor 8 of the video amplifier circuit 2, and the cathode of this diode 90 is grounded via a resistor 10 and a relay 11 in series. The anode of the diode 9 is connected to the ground through a capacitor 13 of the CB time constant circuit 12 and connected to the diode 9 through a resistor 14.
The cathode of this diode 9 is connected to the blanking negative DC voltage output terminal of the low voltage power supply 15. The low voltage power supply 15 and the AC or DC input terminal 16
A contact 17 of the relay 4 is inserted and connected between the two. The low voltage power source 15 is connected to a relay drive voltage application terminal 19 via the relay 4 and a power on/off switch 18 in series. Further, the low voltage power supply 15 is provided with other DC output terminals 2o and xx, and is connected to the DC input terminal of a high voltage power supply 23 via the contact 22 of the relay 11, and the output terminal of this high voltage power supply 23 is connected to a cathode line. Anode terminal 2 of tube 6
Connected to 4. The power on/off switches 18 and 3 are interlocked, and one circuit of the switch 3 is used for a circuit for turning on and off the input side of the video signal.
また、前記リレー11は陰極線管6に印加するブランキ
ング電圧を検知し動作するリレーで、リレー11が動作
状態からオフになるときに高圧電源23の入力電圧を切
る接点22を有している。更に前記リレー4は電源スィ
ッチ18をオフし走時おるいは低圧電源16に異常が発
生した時に作動する。このリレー4の1回路分は陰極線
管6のビデオ信号入力ラインをオンオフするビデオ系リ
レー接点5に用いられ、CR時定数回路12のコンデン
サ13及び抵抗14のみで決定される時定数で有効に作
動することができるようにしたものである。Further, the relay 11 is a relay that operates by detecting the blanking voltage applied to the cathode ray tube 6, and has a contact 22 that cuts off the input voltage of the high voltage power supply 23 when the relay 11 is turned off from the operating state. Furthermore, the relay 4 is activated when the power switch 18 is turned off and the vehicle is running or when an abnormality occurs in the low voltage power source 16. One circuit of this relay 4 is used as a video system relay contact 5 that turns on and off the video signal input line of the cathode ray tube 6, and operates effectively with a time constant determined only by the capacitor 13 and resistor 14 of the CR time constant circuit 12. It was made so that it could be done.
即ち、第1図の動作を次の■〜θの場合について説明す
る。That is, the operation shown in FIG. 1 will be explained for the following cases ① to θ.
■ 電源スィッチのオン、オフ時の場合の動作を第2図
を参照して説明する。第2図は電源スイツチオンオフ動
作タイばングチャートで、(1)は電源スイッチ3,1
8の出力、(b)はビデオ系リレー4の出力、(C)は
低圧電源出力、(d)はビデオ信号、(6)は高圧電源
人力リレー11、(f)はブランキング電圧、−)は高
圧残留特性を示す。(2) The operation when the power switch is turned on and off will be explained with reference to FIG. Figure 2 is a power switch on/off operation timing chart, (1) is a power switch 3, 1
(b) is the output of the video system relay 4, (C) is the low voltage power supply output, (d) is the video signal, (6) is the high voltage power supply manual relay 11, (f) is the blanking voltage, -) shows high pressure residual characteristics.
即ち、電源スィッチ18をオンすると、このスイッチ1
8と連動するビデオ信号入力接点スイッチ3がオンとな
り、同時に、第2図(&)に示すようK IJレー駆動
電圧印加喝19に加えられたリレー駆動電圧がビデオ系
リレー4に供給されてこのリレー4が第2図(b)に示
すように動作する。このリレー4の動作により、接点5
がオンになシ第2図(d)に示すようにビデオ信号が陰
極線管6のグリッドに加えられる。又、前記リレー4の
動作により接点17がオンになり交流または直流入力印
加端16から交流または直流入力が低圧電源15に加え
られる。従って、低圧電源15は第2図(c)に示すよ
うに電源スィッチ18のオン後、リレー4の動作時間T
1だけ遅れて出力を発生する。この低圧電源15の出力
は高圧電源入力リレー11に加えられ、このリレー11
は第2図(、)に示すように低圧電源15の出力から時
間T、後に動作し、このリレー11の動作で接点22が
オンすることにより、低圧電源15から直流入力が高圧
電源23に加えられ、高圧電源23は高圧の陰極線管ア
ノード電圧を陰極線管6のアノード端子24に加える。That is, when the power switch 18 is turned on, this switch 1
8 is turned on, and at the same time, the relay drive voltage applied to the K IJ relay drive voltage application 19 is supplied to the video system relay 4 as shown in FIG. 2 (&). Relay 4 operates as shown in FIG. 2(b). Due to the operation of this relay 4, contact 5
is on, a video signal is applied to the grid of the cathode ray tube 6 as shown in FIG. 2(d). Further, the contact 17 is turned on by the operation of the relay 4, and AC or DC input is applied to the low voltage power supply 15 from the AC or DC input application terminal 16. Therefore, as shown in FIG. 2(c), the low-voltage power supply 15 operates for an operating time T of the relay 4 after the power switch 18 is turned on.
Output is generated with a delay of 1. The output of this low voltage power supply 15 is applied to the high voltage power supply input relay 11, and this relay 11
As shown in FIG. 2(,), the relay 11 operates after a time T after the output of the low voltage power supply 15, and as the contact 22 is turned on by the operation of this relay 11, the DC input from the low voltage power supply 15 is added to the high voltage power supply 23. The high voltage power supply 23 applies a high voltage cathode ray tube anode voltage to the anode terminal 24 of the cathode ray tube 6.
また、低圧電源15の出力は時定数回路12を通して後
、第2図(f)に示すようなブランキング電圧として陰
極線管6のグリッドに加えられる。Further, the output of the low voltage power supply 15 is applied to the grid of the cathode ray tube 6 as a blanking voltage as shown in FIG. 2(f) after passing through the time constant circuit 12.
一方、第2図(、)に示すように電源スィッチ18をオ
フにすると、ビデオ信号入力接点スイッチ3がオフにな
り第2図(d)に示すようにビデオ信号は供給されなく
なると共に第2図(b)に示すようにビデオ系リレー4
がオフとなる。このリレー4のオフにより接点5及び1
7がオフし、接点17のオフにより低圧電源15には交
流又は直流入力が加えられなくなり第2図(、)に示す
ように低圧電源15の出力は時間T、遅れて落ちる。こ
の低圧電源15がオフすると同時に、ブランキング電圧
も第2図(f)に示すようにオフに向かう。この時ブラ
ンキング電圧は時定数回路12のコンデンサ13及び抵
抗14と、低電圧電源15の出力インピーダンスで決ま
るCR時定数に従って負からエクスポーネンシャル的に
零電位に向う。このブランキング電圧を陰極線管6のグ
リッドに印加することにより、第2図(g)に示すよう
に陰極線管6の高圧残留特性により陰極線管6のイオン
焼けを防止することができる。On the other hand, when the power switch 18 is turned off as shown in FIG. 2(,), the video signal input contact switch 3 is turned off and the video signal is no longer supplied as shown in FIG. 2(d). Video system relay 4 as shown in (b)
is turned off. Contacts 5 and 1 are turned off by turning off relay 4.
7 is turned off, and as a result of the contact 17 being turned off, no AC or DC input is applied to the low voltage power supply 15, and the output of the low voltage power supply 15 drops after a time T, as shown in FIG. At the same time as this low voltage power supply 15 is turned off, the blanking voltage also turns off as shown in FIG. 2(f). At this time, the blanking voltage exponentially moves from negative to zero potential according to the CR time constant determined by the capacitor 13 and resistor 14 of the time constant circuit 12 and the output impedance of the low voltage power supply 15. By applying this blanking voltage to the grid of the cathode ray tube 6, ion burnout of the cathode ray tube 6 can be prevented due to the high voltage residual characteristics of the cathode ray tube 6, as shown in FIG. 2(g).
@ ブランキング電圧異常時の場合の動作を第3図を参
照して説明する。第3図はブランキング電圧が異常にな
った場合の動作タイミングチャートで、(a)は電源ス
イッチ3,18の出力、(b)はビデオ系リレー4の出
力、(C)は低圧電源15の出力、(d)はビデオ信号
、(、)は高圧電源人力リレー11、(f)はブランキ
ング電圧、(JK)は高圧残留特性でおる。@ The operation in the case of blanking voltage abnormality will be explained with reference to FIG. 3. Figure 3 is an operation timing chart when the blanking voltage becomes abnormal. The output, (d) is a video signal, (,) is the high voltage power supply manual relay 11, (f) is the blanking voltage, and (JK) is the high voltage residual characteristic.
即ち、電源スイッチ3.18をオン後は■の場合と同様
なので説明を省略する。而して、第3図(f)に示すよ
うにブランキング電圧が異常になると、A点で第3図(
、)に示すように高圧電源人力リレー11が動作状態か
らオフになり、接点22をオフして低圧電源15からの
高圧電源23への直流入力を切シ、高圧電源23からの
陰極線管アノード電圧が陰極線管6のアノード端子24
へ加わらないようにする。又、ブランキング電圧が異常
になった場合、低圧電源15からの電源異常信号がビデ
オ系リレー4に加わってこのリレー4をオフとする。こ
のリレー4のオフによシ接点5及び17はオフとなり、
接点5のオフにより第3図(d)に示すようにビデオ信
号は陰極線管6のグリッドには加わらなくなる。また、
接点17のオフによp交流または直流入力が低圧電源1
5に加わらなくなり、低圧電源15の出力は第3図(C
)に示すように出力されない。而して、高圧電源人力リ
レー11がオフすると同時に高圧電源23からの高圧出
力は第3図(g)の斜線の部分のようにディスチャージ
してゆく。一方、ブランキング電圧はA点以降において
、時定数回路12のコンデンサ13及び抵抗14と低圧
電源15の出力インピーダンスによって決まる時定数に
従って負の電圧から零電位に向かう。このブランキング
電圧を陰極線管6のグリッドに印加することにより、陰
極線管6の高圧残留%性による陰極線管6のイオン焼け
を防止することができる。That is, after turning on the power switch 3.18, the process is the same as in case (2), so the explanation will be omitted. Therefore, when the blanking voltage becomes abnormal as shown in Fig. 3(f), the state shown in Fig. 3(f) occurs at point A.
, ), the high-voltage power supply human-powered relay 11 is turned off from the operating state, the contact 22 is turned off, the DC input from the low-voltage power supply 15 to the high-voltage power supply 23 is cut off, and the cathode ray tube anode voltage from the high-voltage power supply 23 is is the anode terminal 24 of the cathode ray tube 6
Avoid joining. Further, when the blanking voltage becomes abnormal, a power abnormality signal from the low voltage power supply 15 is applied to the video system relay 4 to turn off the relay 4. When this relay 4 is turned off, contacts 5 and 17 are turned off,
By turning off the contact 5, the video signal is no longer applied to the grid of the cathode ray tube 6, as shown in FIG. 3(d). Also,
By turning off the contact 17, the p AC or DC input is switched to the low voltage power supply 1.
5, and the output of the low voltage power supply 15 is as shown in Figure 3 (C
) is not output as shown. As soon as the high-voltage power supply manual relay 11 is turned off, the high-voltage output from the high-voltage power supply 23 is discharged as shown by the shaded area in FIG. 3(g). On the other hand, after point A, the blanking voltage moves from a negative voltage to zero potential according to a time constant determined by the capacitor 13 and resistor 14 of the time constant circuit 12 and the output impedance of the low voltage power supply 15. By applying this blanking voltage to the grid of the cathode ray tube 6, it is possible to prevent ion burnout of the cathode ray tube 6 due to the high voltage residual property of the cathode ray tube 6.
θ 低圧電源に異常があった場合の動作を第4図を参照
して説明する。WJ4図は低圧電源に異常があった場合
の動作タイミングチャートで、(a)は電源スイッチ3
,18の出力、(b)はビデオ系リレー4の出力、(C
)は低圧電源出力、(d)はビデオ信号、(e)は高圧
電源人力リレー23、(f)ブランキング電圧、(X)
高圧残留特性を示す。θ The operation when there is an abnormality in the low voltage power supply will be explained with reference to FIG. Figure WJ4 is an operation timing chart when there is an abnormality in the low voltage power supply, and (a) is the power switch 3.
, 18, (b) is the output of video system relay 4, (C
) is the low voltage power supply output, (d) is the video signal, (e) is the high voltage power supply manual relay 23, (f) is the blanking voltage, (X) is
Shows high pressure residual properties.
即ち、電源スイッチ3,18をオン後は■の場合と同様
なので説明を省略する。而して、低圧電源15に異常が
発生し、ブランキング電圧以外に異常があった場合、電
源異常信号により第4図(b)に示すようにビデオ系リ
レー4がオフになり、接点5及び1rがオフになる。接
点5のオフにより第4図(d)に示すようにビデオ信号
は陰極線管6に加えられなくなり、また、接点17のオ
フにより低圧電源15には交流または [直流入
力が加えられないため、低圧電源15から直流出力はな
くなり、そのため、第4図(a)に示すように高圧電源
人力リレー11がオフし、その接点22がオフして高圧
電源23はオフし第4図(g)に示すように陰極線管6
へのアノード電圧は加えられない。この場合、高圧残留
特性により陰極線管6に高圧が残留するが、この間時定
数回路12によりブランキング電圧を陰極線管6のグリ
ッドに加えることによシ、陰極線管6のイオン焼けを防
止することができる。That is, after the power switches 3 and 18 are turned on, the process is the same as in case (2), so the explanation will be omitted. If an abnormality occurs in the low voltage power supply 15 and there is an abnormality other than the blanking voltage, the power supply abnormality signal turns off the video system relay 4 as shown in FIG. 4(b), and the contacts 5 and 1r is turned off. When the contact 5 is turned off, the video signal is no longer applied to the cathode ray tube 6 as shown in FIG. There is no DC output from the power source 15, so the high voltage power source manual relay 11 is turned off as shown in FIG. 4(a), its contact 22 is turned off, and the high voltage power source 23 is turned off, as shown in FIG. 4(g). Like cathode ray tube 6
No anode voltage is applied to. In this case, high voltage remains in the cathode ray tube 6 due to the high voltage residual characteristic, but during this time, the time constant circuit 12 applies a blanking voltage to the grid of the cathode ray tube 6, thereby preventing ion burnout of the cathode ray tube 6. can.
以上述べたように本発明によれば、電源オンオフ時に確
実にビデオ信号を切ってから高圧電源を切り、陰極線管
の残留特性による電圧が消滅するまでブランキング電圧
を時定数回路で保持するので陰極線管のイオン焼けを防
止することができる。また、ブランキング電圧異常時あ
るいはその他の低電圧源回路異常時でも、陰極線管のイ
オン焼けを防止することができる。更に、本回路は部品
定数が少なく、簡単な回路であり、機器ごとに異なる陰
極線管の時定数を持った回路でも、コンデンサ及び抵抗
の時定数を変更するだけで適応できる回路である。As described above, according to the present invention, when the power is turned on and off, the video signal is reliably turned off and then the high-voltage power is turned off, and the time constant circuit holds the blanking voltage until the voltage due to the residual characteristics of the cathode ray tube disappears. It is possible to prevent ion burning of the tube. Further, even when the blanking voltage is abnormal or other low voltage power supply circuit abnormalities occur, ion burnout of the cathode ray tube can be prevented. Furthermore, this circuit is a simple circuit with a small number of component constants, and can be adapted to circuits where cathode ray tubes have different time constants for different devices by simply changing the time constants of capacitors and resistors.
第1図は本発明の一実施例を示す構成説明図、第2図(
、)〜(2))は本発明に係る電源スィッチをオンオフ
した時の各部の動作タイばングチャート、第3図(、)
〜(g)は本発明に係るブランキング電圧が異常になっ
た場合の動作タイ建ングチャート、第4図(a)〜−)
は本発明に係る低圧電源に異常があった場合の動作タイ
ミングチャートである。
1・・・ビデオ信号の入力端、2・・・ビデオ増幅回路
、3.18・・・電源オンオフスイッチング、4・・・
ビデオ系リレー、6・・・陰極線管、11・・・高圧電
源人力リレー、12・・・時定数回路、15・・・低圧
電源、16・・・交流または直流入力端、19・・・リ
レー駆動電圧印加端、23・・・高圧電源。FIG. 1 is a configuration explanatory diagram showing one embodiment of the present invention, and FIG. 2 (
, ) to (2)) are operation timing charts of each part when the power switch according to the present invention is turned on and off, FIG. 3 (,)
~(g) is an operation timing chart when the blanking voltage becomes abnormal according to the present invention, and FIG. 4(a) ~-)
is an operation timing chart when there is an abnormality in the low voltage power supply according to the present invention. 1... Video signal input terminal, 2... Video amplifier circuit, 3.18... Power on/off switching, 4...
Video system relay, 6... Cathode ray tube, 11... High voltage power supply manual relay, 12... Time constant circuit, 15... Low voltage power supply, 16... AC or DC input terminal, 19... Relay Drive voltage application end, 23...high voltage power supply.
Claims (1)
極線管のアノードに電圧を供給する第1の電源と、交流
または直流が供給されて動作する第2の電源と、この第
2の電源から!ランキング信号が供給され出力信号を前
記グリシ/ げに供給する時定数回路と、前記プラプキング信号で動
作され前記第2の電源から前記第1の電源への直流供給
ラインに設けられた第1の切換器と、前記第2の電源か
らの電源異常信号あるいは駆動電圧が供給されて動作さ
れ前記グリッドへのビデオ信号供給ライン及び前記第2
の電源への交流または直流供給ラインに接点を有する第
2の切換器と、この第2の切換器への駆動電圧供給ライ
ン及び前記グリッドへのビデオ信号供給ラインにそれぞ
れ設けられ連動する第3及び第4の切換器とを具備する
ことを特徴とする陰極線管のイオン焼防止回路。[Claims] A cathode ray tube whose grid is supplied with a video signal, a first power source that supplies voltage to the anode of the cathode ray tube, a second power source that operates by being supplied with alternating current or direct current, and From the second power source! a time constant circuit that is supplied with a ranking signal and supplies an output signal to the grid; and a first switching device that is operated by the plugging signal and is provided in a DC supply line from the second power source to the first power source. The video signal supply line to the grid and the second
a second switch having a contact on an AC or DC supply line to the power source; a third switch connected to and connected to the drive voltage supply line to the second switch and the video signal supply line to the grid, respectively; A fourth switching device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10805982A JPS58225780A (en) | 1982-06-23 | 1982-06-23 | Preventing circuit for ion spot of cathode-ray tube |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10805982A JPS58225780A (en) | 1982-06-23 | 1982-06-23 | Preventing circuit for ion spot of cathode-ray tube |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS58225780A true JPS58225780A (en) | 1983-12-27 |
Family
ID=14474859
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10805982A Pending JPS58225780A (en) | 1982-06-23 | 1982-06-23 | Preventing circuit for ion spot of cathode-ray tube |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS58225780A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55123275A (en) * | 1979-03-15 | 1980-09-22 | Toshiba Corp | Cathode-ray tube display unit |
-
1982
- 1982-06-23 JP JP10805982A patent/JPS58225780A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55123275A (en) * | 1979-03-15 | 1980-09-22 | Toshiba Corp | Cathode-ray tube display unit |
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