JPH06189323A - Cathode-ray tube display device - Google Patents
Cathode-ray tube display deviceInfo
- Publication number
- JPH06189323A JPH06189323A JP4340113A JP34011392A JPH06189323A JP H06189323 A JPH06189323 A JP H06189323A JP 4340113 A JP4340113 A JP 4340113A JP 34011392 A JP34011392 A JP 34011392A JP H06189323 A JPH06189323 A JP H06189323A
- Authority
- JP
- Japan
- Prior art keywords
- ray tube
- cathode ray
- display device
- electric field
- tube 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/16—Picture reproducers using cathode ray tubes
- H04N9/29—Picture reproducers using cathode ray tubes using demagnetisation or compensation of external magnetic fields
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/0007—Elimination of unwanted or stray electromagnetic effects
- H01J2229/0046—Preventing or cancelling fields within the enclosure
- H01J2229/0053—Demagnetisation
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Electrodes For Cathode-Ray Tubes (AREA)
- Details Of Television Scanning (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、陰極線管（以下、Ｃ
ＲＴと呼ぶ）を用いて画像を表示する陰極線管ディスプ
レイ装置に関するものである。This invention relates to a cathode ray tube (hereinafter referred to as C
Called RT) for displaying an image using a cathode ray tube display device.
【０００２】[0002]
【従来の技術】図５はこの種従来の陰極線管ディスプレ
イ装置の外観を示す斜視図である。図において、１は陰
極線管ディスプレイ装置、２はこの陰極線ディスプレイ
装置１の前面に装着されるガラスパネル、３はこのガラ
スパネル２に設けられた低抵抗部材であり、接地線４を
介して大地に接地されている。従来の陰極線管ディスプ
レイ装置においては、フライバックトランス（以下、Ｆ
ＢＴと呼ぶ）や偏向ヨークによりガラスパネル２に誘導
された交番電界を静電遮蔽するために、ガラスパネル２
に低抵抗部材３を設け、この低抵抗部材３を接地線４に
より大地に接地している。2. Description of the Related Art FIG. 5 is a perspective view showing the appearance of a conventional cathode ray tube display device of this type. In the figure, 1 is a cathode ray tube display device, 2 is a glass panel mounted on the front surface of the cathode ray display device 1, and 3 is a low resistance member provided on the glass panel 2, which is grounded via a ground wire 4. It is grounded. In a conventional cathode ray tube display device, a flyback transformer (hereinafter referred to as F
(Referred to as BT) or a deflection yoke to electrostatically shield the alternating electric field induced in the glass panel 2 by the glass panel 2
The low resistance member 3 is provided on the ground, and the low resistance member 3 is grounded to the ground by the ground wire 4.
【０００３】なお、上記交番電界に対する規格は、スウ
ェーデンにおいて施行されたＭＰＲ−ＩＩの中に定めら
れており、ＶＬＦ帯域およびＥＬＦ帯域の２つの周波数
帯域がある。そしてＶＬＦ（Ｖｅｒｙ Ｌｏｗ Ｆｒｅ
ｑｅｎｃｙ）帯域は、周波数帯域が２ＫＨZ〜４００Ｋ
ＨZ、交番電界値は２．５Ｖ／ｍ以下で、測定ポイント
はモニタの外形寸法上のセンターを中心として、ＣＲＴ
面から５０ｃｍの距離を半径とする円周上の前後左右の
４点に定められ、又、ＥＬＦ（Ｅｘｔｒｅｍｅｌｙ Ｌ
ｏｗ Ｆｒｅｑｅｎｃｙ）帯域は、周波数帯域が５ＨZ
〜２ＫＨZ、交番電界値は２５Ｖ／ｍ以下で、測定ポイ
ントはＣＲＴ面から５０ｃｍの距離の前方１点に定めら
れている。The standard for the alternating electric field is defined in MPR-II enforced in Sweden and has two frequency bands, a VLF band and an ELF band. And VLF (Very Low Fre
qency) band, the frequency band is 2KH Z ~400K
H Z , the alternating electric field value is 2.5 V / m or less, the measurement point is centered on the center of the external dimensions of the monitor, and the CRT
It is set at four points on the circumference of the circumference with a radius of 50 cm from the surface, and it is also defined by ELF (Extremely L
ow freqency) band, the frequency band 5H Z
˜2 KH Z , the alternating electric field value is 25 V / m or less, and the measurement point is set at one point in front of the CRT surface at a distance of 50 cm.
【０００４】[0004]
【発明が解決しようとする課題】従来の陰極線管ディス
プレイ装置は以上のように構成され、ガラスパネル２に
誘導された交番電界を静電遮蔽するために、ガラスパネ
ル２に低抵抗部材３を設けているので、その製造コスト
が大幅に上昇し、又、ＣＲＴ面以外の方向、すなわちモ
ニタの横および後方向の遮蔽効果を期待するのは無理で
あるという問題点があった。The conventional cathode ray tube display device is constructed as described above, and the glass panel 2 is provided with the low resistance member 3 in order to electrostatically shield the alternating electric field induced in the glass panel 2. Therefore, there is a problem in that the manufacturing cost thereof is significantly increased and it is impossible to expect a shielding effect in a direction other than the CRT surface, that is, in the lateral and rearward directions of the monitor.
【０００５】この発明は上記のような問題点を解消する
ためになされたもので、製造コストを大幅に上昇させる
ことなく、ＣＲＴ面に誘導されたＶＬＦ帯域の交番電界
を打ち消すことができることは勿論のこと、ＣＲＴ面以
外の方向においてもＶＬＦ帯域の交番電界を打ち消すこ
とができるとともに、さらにＥＬＦ帯域の交番電界を打
ち消すことができる陰極線管ディスプレイ装置を提供す
ることを目的とするものである。The present invention has been made in order to solve the above problems, and it is needless to say that the alternating electric field in the VLF band induced on the CRT surface can be canceled without significantly increasing the manufacturing cost. Therefore, it is an object of the present invention to provide a cathode ray tube display device capable of canceling an alternating electric field in the VLF band even in a direction other than the CRT plane and further canceling the alternating electric field in the ELF band.
【０００６】[0006]
【課題を解決するための手段】この発明の請求項１に係
る陰極線管ディスプレイ装置は、キャビネット内に低抵
抗部材を配設するとともに、この低抵抗部材に陰極線管
面に誘導されるＶＬＦ帯域の交番電界とは逆極性の電圧
を印加するようにしたものである。According to a first aspect of the present invention, in a cathode ray tube display device, a low resistance member is provided in a cabinet, and a VLF band of a VLF band induced on a surface of the cathode ray tube is provided in the low resistance member. A voltage having a polarity opposite to that of the alternating electric field is applied.
【０００７】又、この発明の請求項２に係る陰極線管デ
ィスプレイ装置は、陰極線管内に帯磁している磁気を消
磁するデガウスコイルを消磁後電源回路から切り離すと
ともに、デガウスコイルに陰極線管面に誘導されるＶＬ
Ｆ帯域の交番電界とは逆極性の電圧を印加するようにし
たものである。Further, in the cathode ray tube display device according to the second aspect of the present invention, the degauss coil for demagnetizing the magnetism magnetized in the cathode ray tube is disconnected from the power supply circuit after degaussing, and the degauss coil is induced to the cathode ray tube surface. VL
A voltage having a polarity opposite to that of the alternating electric field in the F band is applied.
【０００８】[0008]
【作用】この発明の請求項１における陰極線管ディスプ
レイ装置の低抵抗部材に印加される電圧は、装置から放
射されるＶＬＦ帯域の交番電界を打ち消す。The voltage applied to the low resistance member of the cathode ray tube display device according to claim 1 of the present invention cancels the alternating electric field in the VLF band emitted from the device.
【０００９】又、この発明の請求項２における陰極線管
ディスプレイ装置のデガウスコイルは、電源回路から切
り離されることにより装置から放射されるＥＬＦ帯域の
交番電界を打ち消すとともに、この電源回路から切り離
されたデガウスコイルに印加される電圧は、装置から放
射されるＶＬＦ帯域の交番電界を打ち消す。The degauss coil of the cathode ray tube display device according to claim 2 of the present invention cancels the alternating electric field in the ELF band radiated from the device by being disconnected from the power supply circuit, and at the same time is disconnected from the power supply circuit. The voltage applied to the coil cancels the alternating electric field in the VLF band emitted from the device.
【００１０】[0010]
【実施例】実施例１．以下、この発明の実施例を図に基
づいて説明する。図１はこの発明の実施例１における陰
極線管ディスプレイ装置の概略構成を示す図である。図
において、１１は陰極線管ディスプレイ装置、１２はこ
の陰極線管ディスプレイ装置１１のキャビネット内の前
面に配設される例えば銅、アルミ等のコイルまたは板等
でなる低抵抗部材、１３はＦＢＴ、１４はこのＦＢＴ１
３の電源、１５はＦＢＴ１３の出力のパルス波形、１６
はトランジスタ、１７はダンパーダイオード、１８は共
振コンデンサ、１９はＶＬＦ帯域と逆極性の電圧で、Ｆ
ＢＴ１３の出力電圧１５の逆電圧が取り出されている。
２０は逆極性の電圧１９のレベルを決めるためのボリュ
ーム、２１はこのボリューム２０と低抵抗部材１２とを
接続する接続線である。EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. 1 is a diagram showing a schematic configuration of a cathode ray tube display device according to Embodiment 1 of the present invention. In the figure, 11 is a cathode ray tube display device, 12 is a low resistance member such as a coil or plate made of, for example, copper, aluminum or the like disposed in the front surface of the cabinet of the cathode ray tube display device 11, 13 is an FBT, and 14 is a This FBT1
3 is a power source, 15 is a pulse waveform of the output of the FBT 13, 16
Is a transistor, 17 is a damper diode, 18 is a resonance capacitor, 19 is a voltage having a polarity opposite to the VLF band, and F
The reverse voltage of the output voltage 15 of the BT 13 is taken out.
Reference numeral 20 is a volume for determining the level of the reverse polarity voltage 19, and reference numeral 21 is a connection line connecting the volume 20 and the low resistance member 12.
【００１１】上記のように構成される実施例１によれ
ば、ＦＢＴ１３の巻線より取り出された逆極性の電圧１
９を、ボリューム２０によってレベルを調整した後、接
続線２１を介して低抵抗部材１２に印加しているので、
この印加された逆極性の電圧１９により、通常、陰極線
管ディスプレイ装置１１から放射されているＶＬＦ帯域
の交番電界は打ち消され、図２（Ａ）に示す通常の交番
電界の波形ａに比較し、図２（Ｂ）に示す逆極性の電圧
１９印加後の交番電界の波形ｂが大幅に低減しているこ
とが判る。According to the first embodiment configured as described above, the reverse polarity voltage 1 extracted from the winding of the FBT 13 is used.
9 is applied to the low resistance member 12 through the connection line 21 after the level is adjusted by the volume 20,
By this applied voltage 19 of the opposite polarity, the alternating electric field in the VLF band which is normally radiated from the cathode ray tube display device 11 is canceled, and compared with the waveform a of the normal alternating electric field shown in FIG. It can be seen that the waveform b of the alternating electric field after the application of the reverse polarity voltage 19 shown in FIG. 2B is significantly reduced.
【００１２】又、下記の表１には実測された各部のＶＬ
Ｆ帯域の交番電界値を、従来装置の場合と比較してそれ
ぞれ示したが、低抵抗部材１２が配設されたＣＲＴ面方
向に関しては、半分以下に低減していることが明かであ
る。したがって、他のＶＬＦ帯域の交番電界値を低減し
たい方向に関しても、低抵抗部材１２を追加して配設し
逆極性の電圧１９を印加すれば、ＶＬＦ帯域の交番電界
値低減効果を更に上げることが可能である。Further, Table 1 below shows the measured VL of each part.
The alternating electric field values in the F band are shown in comparison with the case of the conventional device, but it is clear that the value is reduced to less than half in the CRT surface direction in which the low resistance member 12 is arranged. Therefore, also in the direction in which it is desired to reduce the alternating electric field value in the other VLF band, the effect of reducing the alternating electric field value in the VLF band can be further enhanced by additionally disposing the low resistance member 12 and applying the voltage 19 of the opposite polarity. Is possible.
【００１３】[0013]
【表１】 [Table 1]
【００１４】実施例２．図３はこの発明の実施例２にお
ける陰極線管ディスプレイ装置の構成を示す回路図であ
る。図において、図１に示す実施例１と同様な部分は同
一符号を付して説明を省略する。２２はＣＲＴに巻回さ
れＣＲＴ内部を消磁するデガウスコイル、２３、２４は
このデガウスコイル２２を電源回路２５から切り離すた
めのリレーであり、デガウスコイル２２を電源回路２５
から切り離した後、逆極性の電圧１９が印加されるボリ
ューム２０側に接続する。２６、２７は両リレー２３、
２４に接続される誤動作防止ダイオード、２８はリレー
用の電源、２９はリレー制御用トランジスタ、３０はポ
ジスターである。Example 2. FIG. 3 is a circuit diagram showing the configuration of a cathode ray tube display device according to Embodiment 2 of the present invention. In the figure, the same parts as those in the first embodiment shown in FIG. Reference numeral 22 is a degauss coil wound around the CRT to demagnetize the inside of the CRT, and 23 and 24 are relays for disconnecting the degauss coil 22 from the power supply circuit 25.
After disconnecting from, it is connected to the side of the volume 20 to which the voltage 19 of opposite polarity is applied. 26 and 27 are both relays 23,
A malfunction preventing diode connected to 24, a power source for relay 28, a relay control transistor 29, and a posistor 30.
【００１５】上記のように構成される実施例２によれ
ば、まず電源回路２５が動作すると、デガウスコイル２
２には電源回路２５からポジスター３０および両リレー
２３、２４を介して、ＣＲＴに帯電している磁気を消磁
するためのデガウス電源が流れ、この電流はポジスター
３０によって収束され消磁が行われる。そして、消磁が
終了すると、リレー制御用トランジスタ２９を介して両
リレー２３、２４に切り換え信号が印加され、両リレー
２３、２４はデガウスコイル２２を電源回路２５から切
り離すとともに、ボリューム２０側に切り換えることに
よって、ボリューム２０を介して逆極性の電圧１９をデ
ガウスコイル２２に印加する。According to the second embodiment configured as described above, when the power supply circuit 25 first operates, the degauss coil 2
A degauss power supply for demagnetizing the magnetism charged in the CRT flows from the power supply circuit 25 through the posistor 30 and both relays 23 and 24 to this 2, and this current is converged and degaussed by the posistor 30. Then, when the demagnetization is completed, a switching signal is applied to both relays 23 and 24 via the relay control transistor 29, and both relays 23 and 24 disconnect the degauss coil 22 from the power supply circuit 25 and switch to the volume 20 side. A voltage 19 of opposite polarity is applied to the degauss coil 22 via the volume 20.
【００１６】したがって、消磁後デガウスコイル２２が
ＥＬＦ帯域の交番電界の発生源である電源回路２５から
切り離されるために、デガウスコイル２２からＥＬＦ帯
域の交番電界が放射されることもなくなり、又、両リレ
ー２３、２４動作後、デガウスコイル２２には逆極性の
電圧が印加されるので、上記実施例１で述べたと同様に
ＶＬＦ帯域の交番電界の発生も防止される。Therefore, since the degauss coil 22 after demagnetization is disconnected from the power supply circuit 25 which is the source of the alternating electric field in the ELF band, the degauss coil 22 no longer emits the alternating electric field in the ELF band. After the relays 23 and 24 are operated, the reverse polarity voltage is applied to the degauss coil 22, so that the generation of the alternating electric field in the VLF band is prevented as in the first embodiment.
【００１７】実施例３．なお、上記各実施例では、逆極
性の電圧１９をＦＢＴ１３から取り出す場合について説
明したが、別振り方式の水平偏向回路では、図４に示す
ように逆極性の電圧３１を、水平出力トランス３２から
取り出すようにしても、上記各実施例同様の効果を発揮
することができる。Embodiment 3. In each of the above-described embodiments, the case where the reverse polarity voltage 19 is taken out from the FBT 13 has been described. However, in the horizontal deflection circuit of the separate type, the reverse polarity voltage 31 is supplied from the horizontal output transformer 32 as shown in FIG. Even if it is taken out, the same effect as each of the above embodiments can be exhibited.
【００１８】[0018]
【発明の効果】以上のように、この発明の請求項１によ
れば、キャビネット内に低抵抗部材を配設するととも
に、この低抵抗部材に陰極線管面に誘導されるＶＬＦ帯
域の交番電界とは逆極性の電圧を印加するようにしたの
で、ＶＬＦ帯域の交番電界の低減が、又、この発明の請
求項２によれば、陰極線管内に帯磁している磁気を消磁
するデガウスコイルを消磁後電源回路から切り離すとと
もに、デガウスコイルに陰極線管面に誘導されるＶＬＦ
帯域の交番電界とは逆極性の電圧を印加するようにした
ので、ＥＬＦ帯域およびＶＬＦ帯域の交番電界の低減が
安価に達成できる陰極線管ディスプレイ装置を提供する
ことができる。As described above, according to claim 1 of the present invention, a low resistance member is provided in the cabinet, and an alternating electric field in the VLF band induced on the cathode ray tube surface is provided in the low resistance member. Since the reverse polarity voltage is applied, the reduction of the alternating electric field in the VLF band is reduced, and according to claim 2 of the present invention, after degaussing the degauss coil for demagnetizing the magnetism magnetized in the cathode ray tube. VLF which is separated from the power supply circuit and induced in the cathode ray tube surface by the degauss coil
Since the voltage having the opposite polarity to the alternating electric field of the band is applied, it is possible to provide the cathode ray tube display device in which the alternating electric field of the ELF band and the VLF band can be reduced at low cost.
【図１】この発明の実施例１における陰極線管ディスプ
レイ装置の概略構成を示す図である。FIG. 1 is a diagram showing a schematic configuration of a cathode ray tube display device according to a first embodiment of the present invention.
【図２】図１に示す陰極線管ディスプレイ装置における
ＶＬＦ帯域の交番電界の波形を、従来装置におけるＶＬ
Ｆ帯域の交番電界の波形と比較して示す波形図である。FIG. 2 shows a waveform of an alternating electric field in a VLF band in the cathode ray tube display device shown in FIG.
It is a waveform diagram shown in comparison with the waveform of the alternating electric field in the F band.
【図３】この発明の実施例２における陰極線管ディスプ
レイ装置の構成を示す回路図である。FIG. 3 is a circuit diagram showing a configuration of a cathode ray tube display device according to a second embodiment of the present invention.
【図４】この発明の実施例３における陰極線管ディスプ
レイ装置の構成を示す回路図である。FIG. 4 is a circuit diagram showing a configuration of a cathode ray tube display device according to Embodiment 3 of the present invention.
【図５】従来の陰極線管ディスプレイ装置の外観を示す
斜視図である。FIG. 5 is a perspective view showing an appearance of a conventional cathode ray tube display device.
１、１１ 陰極線管ディスプレイ装置 ２ ガラスパネル ３、１２ 低抵抗部材 １３ ＦＢＴ １９、３１ 逆極性の電圧 ２０ ボリューム ２２ デガウスコイル ２３、２４ リレー ３０ ポジスター ３２ 水平出力トランス 1, 11 Cathode ray tube display device 2 Glass panel 3, 12 Low resistance member 13 FBT 19, 31 Reverse polarity voltage 20 Volume 22 Degauss coil 23, 24 Relay 30 Posistar 32 Horizontal output transformer
【手続補正書】[Procedure amendment]
【提出日】平成５年３月２９日[Submission date] March 29, 1993
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図４[Name of item to be corrected] Fig. 4
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図４】 [Figure 4]
Claims (2)
管ディスプレイ装置において、キャビネット内に低抵抗
部材を配設するとともに、上記低抵抗部材に上記陰極線
管面に誘導されるＶＬＦ帯域の交番電界とは逆極性の電
圧を印加するようにしたことを特徴とする陰極線管ディ
スプレイ装置。1. A cathode ray tube display device for displaying an image using a cathode ray tube, wherein a low resistance member is provided in a cabinet, and an alternating electric field of a VLF band induced on the cathode ray tube surface by the low resistance member. A cathode ray tube display device characterized in that a voltage having a polarity opposite to that of is applied.
管ディスプレイ装置において、上記陰極線管内に帯磁し
ている磁気を消磁するデガウスコイルを上記消磁後電源
回路から切り離すとともに、上記デガウスコイルに上記
陰極線管面に誘導されるＶＬＦ帯域の交番電界とは逆極
性の電圧を印加するようにしたことを特徴とする陰極線
管ディスプレイ装置。2. A cathode ray tube display device for displaying an image using a cathode ray tube, wherein a degauss coil for demagnetizing magnetism magnetized in the cathode ray tube is separated from the power circuit after the degaussing, and the cathode line is provided on the degauss coil. A cathode ray tube display device, characterized in that a voltage having a polarity opposite to that of an alternating electric field of a VLF band induced on a tube surface is applied.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4340113A JPH06189323A (en) | 1992-12-21 | 1992-12-21 | Cathode-ray tube display device |
| TW082110082A TW281754B (en) | 1992-12-21 | 1993-11-30 | |
| KR1019930027688A KR940017904A (en) | 1992-12-21 | 1993-12-14 | Cathode Ray Tube Display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4340113A JPH06189323A (en) | 1992-12-21 | 1992-12-21 | Cathode-ray tube display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06189323A true JPH06189323A (en) | 1994-07-08 |
Family
ID=18333848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4340113A Pending JPH06189323A (en) | 1992-12-21 | 1992-12-21 | Cathode-ray tube display device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH06189323A (en) |
| KR (1) | KR940017904A (en) |
| TW (1) | TW281754B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5789872A (en) * | 1995-02-20 | 1998-08-04 | Matsushita Electric Industrial Co., Ltd. | Leakage field decreasing device for CRT display |
| US6914384B2 (en) | 2002-10-04 | 2005-07-05 | Samsung Electronics Co., Ltd. | Degaussing circuit for CRT monitor |
-
1992
- 1992-12-21 JP JP4340113A patent/JPH06189323A/en active Pending
-
1993
- 1993-11-30 TW TW082110082A patent/TW281754B/zh active
- 1993-12-14 KR KR1019930027688A patent/KR940017904A/en not_active Application Discontinuation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5789872A (en) * | 1995-02-20 | 1998-08-04 | Matsushita Electric Industrial Co., Ltd. | Leakage field decreasing device for CRT display |
| US6914384B2 (en) | 2002-10-04 | 2005-07-05 | Samsung Electronics Co., Ltd. | Degaussing circuit for CRT monitor |
Also Published As
| Publication number | Publication date |
|---|---|
| KR940017904A (en) | 1994-07-27 |
| TW281754B (en) | 1996-07-21 |
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