JPH04132486A - Degaussing device - Google Patents
Degaussing deviceInfo
- Publication number
- JPH04132486A JPH04132486A JP25556690A JP25556690A JPH04132486A JP H04132486 A JPH04132486 A JP H04132486A JP 25556690 A JP25556690 A JP 25556690A JP 25556690 A JP25556690 A JP 25556690A JP H04132486 A JPH04132486 A JP H04132486A
- Authority
- JP
- Japan
- Prior art keywords
- degaussing
- degauss
- turned
- coil
- power switch
- 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
- 230000000694 effects Effects 0.000 abstract description 7
- 230000007423 decrease Effects 0.000 description 4
- 230000005415 magnetization Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005347 demagnetization Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 230000005291 magnetic effect Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Video Image Reproduction Devices For Color Tv Systems (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などのブラウン管の着磁を
防止する消磁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 demagnetizing device for preventing magnetization of a cathode ray tube such as a television receiver.
従来の技術
消磁装置とは、ブラウン管への着磁（外部から強磁性体
物質の印加、地磁気の影響等が原因）を防止し、正確な
色再現を計る補助回路で、テレビジョン受像機の場合に
は電源スィッチと連動して動作するようになっている。Conventional Technology A degaussing device is an auxiliary circuit that prevents magnetization of cathode ray tubes (caused by the application of ferromagnetic substances from outside, the influence of earth's magnetism, etc.) and ensures accurate color reproduction. It is designed to operate in conjunction with the power switch.
第３図はテレビジョン受像機〔以下、ＴＶと称す〕の従
来の消磁装置を示す、ブラウン管に近接して配置された
消磁コイル１は、そのコイル自身に交ｉｔ源を流すこと
により、ブラウン管の着磁を無くすもので、ＴＶの電源
スィッチ４のオンと同時に消磁素子２を通して交流電源
を流す。この消磁素子２は、消磁コイル１による消磁効
果を高めるために、ＴＶの電源オン時にできるだけ大き
な突入を流を消磁コイル１に流し、ブラウン管の着磁が
減少するにつれて突入電流を少なくするように設けであ
る。３は発振防止用の抵抗器である。FIG. 3 shows a conventional degaussing device for a television receiver (hereinafter referred to as TV). A degaussing coil 1 placed close to a cathode ray tube degausses the cathode ray tube by passing an alternating current source through the coil itself. This eliminates magnetization, and AC power is applied through the degaussing element 2 at the same time as the TV power switch 4 is turned on. In order to enhance the demagnetizing effect of the degaussing coil 1, this degaussing element 2 is installed so that as large an inrush current as possible is passed through the degaussing coil 1 when the TV is turned on, and the inrush current is reduced as the magnetization of the cathode ray tube decreases. It is. 3 is a resistor for preventing oscillation.
このため消磁素子２の特性として、その抵抗の初期値が
ほぼ０で、通電することによって抵抗値が無限大近くま
で変化するようなものが必要である。具体的には、消磁
素子２は正の温度特性の第１の抵抗２ａとこの第１の抵
抗２ａとは熱結合した発熱用の第２の抵抗２ｂとで構成
されており、電源スィッチ４を閉じると消磁コイル１と
第１の抵抗２ａで形成される直列回路に、交流の電流が
流れる。第１の抵抗２ａは電源スィッチ４がオフ時には
その温度が常温であるため、初期抵抗値がほぼＯであり
、消磁コイル１のインピーダンスだけによって決まる突
入電流が、電源スイ・・ｌチ４のオンとともに消磁コイ
ル１に流れ、消磁用の交流磁界を発生ずる。Therefore, the characteristics of the demagnetizing element 2 are such that the initial value of its resistance is approximately 0, and the resistance value changes to nearly infinity when energized. Specifically, the demagnetizing element 2 is composed of a first resistor 2a having a positive temperature characteristic and a second heat generating resistor 2b which is thermally coupled to the first resistor 2a. When closed, an alternating current flows through the series circuit formed by the degaussing coil 1 and the first resistor 2a. Since the temperature of the first resistor 2a is at room temperature when the power switch 4 is off, its initial resistance value is approximately O, and the inrush current determined only by the impedance of the degaussing coil 1 is generated when the power switch 4 is turned on. At the same time, the current flows to the demagnetizing coil 1, generating an alternating current magnetic field for demagnetizing.
この通電にＪ、って第１の抵抗２ａの温度が一卜昇し、
さらに第２の抵抗２ｂからの熱も加わり、第１の抵抗２
ａの抵抗値は短時間に無限大近くまで上昇し、これにと
もない消磁コイルエに流れる突入電流が減少する。Due to this energization, the temperature of the first resistor 2a rises by J.
Furthermore, heat from the second resistor 2b is added, and the first resistor 2
The resistance value of a increases to nearly infinity in a short time, and the rush current flowing through the degaussing coil element decreases accordingly.
第１の抵抗２ａは第２の抵抗２ｂから発生する熱で引き
続き加熱され続け、その抵抗値が無限大近くの値を保持
づ−るため、消磁コイル１に電流が流れない状態が２電
源スイツチ４をオフするまで＃枕される。The first resistor 2a continues to be heated by the heat generated from the second resistor 2b, and its resistance value maintains a value close to infinity, so that the state in which no current flows through the degaussing coil 1 occurs when the second power switch #Be pillowed until you turn off 4.
発明が解決しようとする課題
しか１７、このような構成では電源スイッチ４をオフす
るまで第１の抵抗２ａが第２の抵抗２ｂによ−）て加熱
されつづけているため、電源スィッチ・１をオフして直
ちにオンしたような場合には、電源スイツチをオンした
ときに第１の抵抗２ａの温度が高く、消磁に必要な十分
な＄流が消磁コイル１に流れない状態が発生し、特に大
型サイズのブラウン管を使用したＴＶなどにおいては、
消磁が不充分で、色再現の低下が目立つ。The only problem to be solved by the invention is that in such a configuration, the first resistor 2a continues to be heated by the second resistor 2b until the power switch 4 is turned off. If the power switch is turned off and then turned on immediately, the temperature of the first resistor 2a will be high when the power switch is turned on, and a situation will occur where sufficient $ current necessary for degaussing will not flow through the degaussing coil 1. For TVs that use large-sized cathode ray tubes,
Degaussing is insufficient and color reproduction is noticeably degraded.
このため従来では、電源スィッチ４をオンにしてブラウ
ン管の消磁を行い、再消磁可能な状態にするには、′Ｓ
源スイッチ４をオフに！〜て、しばらく〔具体的には５
分間以上〕待ってから再投入しなければならないという
間趙がある。For this reason, conventionally, in order to demagnetize the cathode ray tube by turning on the power switch 4 and to make it ready for re-demagnetization, 'S
Turn off power switch 4! ~, for a while [specifically 5
There is a time when you have to wait more than 1 minute and then reload.
本発明は短時間のあいだに電源スィッチを再投入したよ
うな場合にも十分な消磁効県を期待できる消磁装置を促
供づることを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a demagnetizing device that can be expected to have a sufficient demagnetizing effect even when the power switch is turned on again for a short period of time.
課題を解決するための手段
この課題を解決するために本発明の消磁装！はブラウン
管に近接して配置された消磁コイルに流れる突入電流を
消磁素子で制御するように構成するどともに、前記消磁
コイルへの通電開始から規定時間後に前記消磁素子への
通電をオフするタイマ装置を設けたことを特徴とする。Means for Solving the Problem In order to solve this problem, the demagnetizing device of the present invention is used! is configured such that a rush current flowing through a degaussing coil disposed close to a cathode ray tube is controlled by a degaussing element, and a timer device that turns off energization to the degaussing element after a specified time from the start of energization to the degaussing coil. It is characterized by having the following.
作用
この構成によると、消磁コイルへの通電開始から規定時
間後にタイマ装置によって消磁素子に流れる電流を自動
的にオフする。したがって、消磁装置が設けられている
テレビジョン受＠機などが使用中においても消磁素子の
温度が低下する。According to this configuration, the timer device automatically turns off the current flowing through the demagnetizing element after a predetermined time has elapsed from the start of energization to the demagnetizing coil. Therefore, even when a television receiver or the like equipped with a degaussing device is in use, the temperature of the degaussing element decreases.
実施例
以下、本発明の実施例を第１図と第２図に基づいて説明
する。なお従来例を示す第３図と同様の作用をなすもの
には同一の符号をつけて説明する。Embodiments Hereinafter, embodiments of the present invention will be explained based on FIGS. 1 and 2. Components having the same functions as those in FIG. 3 showing the conventional example will be described with the same reference numerals.
本発明の消磁装置は、第１図に示すように、交流４４源
から電源スィッチ４を経由して消磁回路６に交流電流を
供給する経銘の途中に、電源スイツチ４をオンし、てか
ら規定時間後に開どなるタイマ装置としての時限動作式
電磁開閉器７が設けられている。ここでは時＠動作式電
磁開閉器゛７には規定時間として３０秒が設定されてい
る。しｆ：がって、電源コンセント５をＡＣＩＯ（＋ボ
ルトに接続し、電源スィッチ４をオンすることにより、
時限動作式電磁開閉器７の接点７ｂが閏となり、消磁素
子２を通して消磁コイル１に＃＠流が流れる。電流は第
１の抵抗２ａの作用によって次第に低Ｆする突入ｔａで
Ｊ’）って、これによってブラウン管の消磁が実行され
る。As shown in FIG. 1, the degaussing device of the present invention turns on the power switch 4 while supplying AC current from the AC 44 source to the degaussing circuit 6 via the power switch 4, and then A time-limited electromagnetic switch 7 is provided as a timer device that opens after a specified time. Here, 30 seconds is set as the specified time for the time-operated electromagnetic switch 7. f: Therefore, by connecting the power outlet 5 to ACIO (+volt) and turning on the power switch 4,
The contact point 7b of the time-limited electromagnetic switch 7 becomes a leap, and the #@ current flows through the demagnetizing coil 1 through the demagnetizing element 2. The current gradually decreases in F due to the action of the first resistor 2a at an inrush ta (J'), thereby demagnetizing the cathode ray tube.
″ＩＸａスイッチ・４がオン状態になっていても、時限
動作式電磁開閉器７は設定された規定時間３０秒で開と
なり消磁コイル１と消磁素子２への通電をオフするため
、電源スイッチ４がオン状態になっていても３０秒を経
過すると消磁素子２の温度が低下し、電源スイッチ４を
オフした直後に再投入しても、消磁素子２を介して消磁
コイ／Ｌ１には、十分な消磁効果を期待できる大きさの
突入電ｉ４が流れる。``Even if the IXa switch 4 is in the on state, the time-limited electromagnetic switch 7 will open after the set specified time of 30 seconds and the power to the degaussing coil 1 and degaussing element 2 will be turned off. Even if it is in the on state, the temperature of the degaussing element 2 will drop after 30 seconds, and even if the power switch 4 is turned off and then turned on again, the degaussing coil/L1 will be sufficiently heated through the degaussing element 2. An inrush current i4 of a magnitude that can be expected to have a strong demagnetizing effect flows.
第２図は別の実施例を示す、第１図に示した実施例では
タイマ装置として時限動作式電磁開閉器７を設けたが、
この￥施例ではマイクロコンピュータ９と、このマイク
ロコンピュータ９がらの開閉の指示を受けて直ちにその
接点８ｂを開閉する′Ｓ電磁開閉器とでタイマ装置７が
構成されている。FIG. 2 shows another embodiment. In the embodiment shown in FIG. 1, a timed electromagnetic switch 7 was provided as a timer device.
In this embodiment, the timer device 7 is constituted by a microcomputer 9 and an electromagnetic switch which immediately opens and closes its contact 8b upon receiving an instruction to open and close the microcomputer 9.
電源スイツチ４がオンされると、マイクロコンビ、１−
夕９から電磁開閉器８の閉を櫓示するＹ（（ハイレベル
信号）が出力され、抵抗１０を介してトランジスタ１１
をオンし電磁開閉器８の励磁コイル８ａを励磁してその
接点８ｂが閉となり、消磁素子２を通して消磁コイル１
に交流電流が流れる。When the power switch 4 is turned on, the microcombi, 1-
From 9pm onwards, Y ((high level signal) indicating the closing of the electromagnetic switch 8 is output, and the transistor 11 is output via the resistor 10.
is turned on, the excitation coil 8a of the electromagnetic switch 8 is energized, its contact 8b is closed, and the demagnetization coil 1 is passed through the demagnetization element 2.
An alternating current flows through.
マイクロコンピュータ９はＨの信号を出力して３０秒後
にＬの信号を出力して電磁開閉器８を開にする。これに
より、電源スィッチ４がオン状態になっていてら消磁コ
イル１と消磁素子２への通電が遮断され、電源スィッチ
４をオフした直後に再投入しても十分な突入電流を消磁
コイル１に流すことができる。The microcomputer 9 outputs an H signal and 30 seconds later outputs an L signal to open the electromagnetic switch 8. As a result, even if the power switch 4 is in the on state, the power to the degaussing coil 1 and the degaussing element 2 is cut off, and even if the power switch 4 is turned on immediately after being turned off, a sufficient inrush current flows through the degaussing coil 1. be able to.
発明の効果
以上のように本発明によれば、ブラウン管に近接して配
置された消磁コイルに流れる突入電流を消磁索子で制御
するように構成するとともに、前記消磁コイルへの通電
開始から規定時間後に前記消磁素子への通電をオフする
タイマ装置を設けたため、テレビジョン受＠機などが使
用中であっても消磁素子への通電がタイマ装置によって
オフされ、消磁索子の自己温度が高いままの状態が継続
しない構成であって、電源スィッチをオフした直後に再
びオンしたような場合であっても十分な消磁効果を期待
することができる。したがって、特に大型サイズのブラ
ウン管を使用したテレビジョン受像機の色再現性の向上
に寄与できるものである。Effects of the Invention As described above, according to the present invention, the inrush current flowing through the degaussing coil disposed close to the cathode ray tube is controlled by the degaussing wire, and the inrush current flowing through the degaussing coil placed close to the cathode ray tube is controlled by the degaussing cord, and the time from the start of energization to the degaussing coil is set within a specified time. Later, a timer device was installed to turn off the power to the degaussing element, so even if a television receiver, etc. was in use, the timer device turned off the power to the degaussing element, and the self-temperature of the degaussing element remained high. Even if this state does not continue and the power switch is turned on again immediately after being turned off, a sufficient degaussing effect can be expected. Therefore, it can particularly contribute to improving the color reproducibility of television receivers using large-sized cathode ray tubes.
第１図は本発明の第１の実施例における消磁装置の回路
図、第２図は本発明の第２の実施例における消磁装置の
回路図、第３図は従来の消磁装置の回路図である。
１・・・消磁コイル、２・・・消磁素子、７・・・時限
動作式電磁開閉器〔タイマ装置〕。
代理人 森 本 義 弘
第１図
第２図
す
消磁クイル
〕肖るムＪえ十
第１ｔｎ柩杭FIG. 1 is a circuit diagram of a degaussing device according to a first embodiment of the present invention, FIG. 2 is a circuit diagram of a degaussing device according to a second embodiment of the present invention, and FIG. 3 is a circuit diagram of a conventional degaussing device. be. 1... Demagnetizing coil, 2... Demagnetizing element, 7... Timed operation type electromagnetic switch [timer device]. Agent Yoshihiro Morimoto Figure 1 Figure 2 Demagnetizing quill
Claims (1)
る突入電流を消磁素子で制御するように構成するととも
に、前記消磁コイルへの通電開始から規定時間後に前記
消磁素子への通電をオフするタイマ装置を設けた消磁装
置。1. A degaussing element is configured to control an inrush current flowing through a degaussing coil disposed close to a cathode ray tube, and a timer device is provided to turn off energization to the degaussing element after a specified time from the start of energization to the degaussing coil. degaussing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25556690A JPH04132486A (en) | 1990-09-25 | 1990-09-25 | Degaussing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25556690A JPH04132486A (en) | 1990-09-25 | 1990-09-25 | Degaussing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04132486A true JPH04132486A (en) | 1992-05-06 |
Family
ID=17280502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25556690A Pending JPH04132486A (en) | 1990-09-25 | 1990-09-25 | Degaussing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04132486A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5696565A (en) * | 1994-12-15 | 1997-12-09 | Sony Corporation | Demagnetizing device is automatically energized after counting a set number of power-on operations of a cathode ray tube |
-
1990
- 1990-09-25 JP JP25556690A patent/JPH04132486A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5696565A (en) * | 1994-12-15 | 1997-12-09 | Sony Corporation | Demagnetizing device is automatically energized after counting a set number of power-on operations of a cathode ray tube |
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