JPH05325837A - Cathode-ray tube - Google Patents

Abstract

PURPOSE:To provide a cathode-ray tube of high safety by forming a second conductive film in conduction to a conductive film formed on the surface of a funnel main body portion, and covering the horizontal deflection coil outer surface of a deflection yoke with an insulating member. CONSTITUTION:A second conductive film 9 is formed in conduction to a conductive film 7 formed on the surface of a funnel main body portion 1c in such a manner as to cover the outer surface of a funnel portion 1 from a cone portion 1b to a neck portion 1a. The horizontal deflection coil 8a of a deflection yoke 8 is covered at its outer surface with an insulating member. The film 9 is grounded via the film 7 and therefore serves as a conductive surface with a potential of 0V and a face having field shielding effects is formed in the opening front region of the yoke 8 whereby alternating electric fields produced at the yoke 8 and passing through the funnel portion 1 are reduced. Since the coil 8a and the film 9 are insulated from each other, no discharge is generated therebetween. A cathode-ray tube having high safety is thus provided.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】この発明は、電子銃から出射され
る電子ビームを偏向するための偏向ヨークから放射され
る交番電界の低減を図った陰極線管に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube for reducing an alternating electric field emitted from a deflection yoke for deflecting an electron beam emitted from an electron gun.

【０００２】[0002]

【従来の技術】図４はこの種の従来の陰極線管の構成を
示す図である。図において、１は順次連結されるネック
部１ａ、コーン部１ｂおよびファンネル本体部１ｃでな
るファンネル部で、ネック部１ａとコーン部１ｂとのつ
なぎ目には、ネックシールラインと呼ばれガラス肉厚が
やや薄く、強度が他の所と比較し弱い部分１ｅが形成さ
れている。２はファンネル本体部１ｃの端部にフリット
封止されたパネル部、３はネック部１ａに封止された電
子銃である。2. Description of the Related Art FIG. 4 is a diagram showing the structure of a conventional cathode ray tube of this type. In the figure, reference numeral 1 is a funnel portion composed of a neck portion 1a, a cone portion 1b and a funnel body portion 1c which are sequentially connected. At a joint between the neck portion 1a and the cone portion 1b, a glass wall called a neck seal line is formed. A part 1e is formed which is slightly thin and has a weaker strength than the other parts. Reference numeral 2 is a panel portion which is frit-sealed at the end of the funnel body portion 1c, and 3 is an electron gun which is sealed at the neck portion 1a.

【０００３】４は防爆特性を保証するためにパネル部２
の側面に巻きつけられた防爆バンドで、４隅には陰極線
管自体を筐体（図示せず）に懸架するための封止部４ａ
が一体的に設けられている。５はファンネル本体部１ｃ
に設けられた高圧アノードボタン、６はこの高圧アノー
ドボタン５の周囲に絶縁のため形成されたシリコン樹脂
膜、７はファンネル本体部１ｃの外表面に黒鉛を塗布し
て形成される導電膜で、陰極線管に静電容量を付加する
ために設けられている。Reference numeral 4 denotes a panel portion 2 for ensuring explosion-proof characteristics.
An explosion-proof band wrapped around the side surface of the cathode, and sealing portions 4a for suspending the cathode ray tube itself in a housing (not shown) at four corners.
Are provided integrally. 5 is the funnel body 1c
, 6 is a silicon resin film formed around the high voltage anode button 5 for insulation, and 7 is a conductive film formed by applying graphite to the outer surface of the funnel body 1c. It is provided to add capacitance to the cathode ray tube.

【０００４】そして、上記のように構成された陰極線管
には、図５に示されるような、水平偏向コイル８ａ、垂
直偏向コイル８ｂおよび偏向ヨーク本体部８ｃによって
構成される偏向ヨーク８が、図６に示すように、コーン
部１ｂとネック部１ａの間の位置に電子銃３から出射さ
れる電子ビームを偏向するために取りつけられている。In the cathode ray tube constructed as described above, a deflection yoke 8 composed of a horizontal deflection coil 8a, a vertical deflection coil 8b and a deflection yoke main body 8c as shown in FIG. As shown in FIG. 6, it is attached to a position between the cone portion 1b and the neck portion 1a for deflecting the electron beam emitted from the electron gun 3.

【０００５】次に上記のように構成された従来の陰極線
管の動作について説明する。まず、ネック部１ａに封止
された電子銃３から電子ビームが出射されると、この出
射された電子ビームは偏向ヨーク８の水平偏向コイル８
ａ、垂直偏向コイル８ｂにより、水平、垂直方向に所定
量偏向されてパネル部２の内面に形成された蛍光膜（図
示せず）上を走査して所望の画像を映出する。このとき
の偏向の振れ幅は上記したアノードボタン５に印加され
る電圧の平方根に比例する。Next, the operation of the conventional cathode ray tube having the above structure will be described. First, when an electron beam is emitted from the electron gun 3 sealed in the neck portion 1 a, the emitted electron beam is applied to the horizontal deflection coil 8 of the deflection yoke 8.
a, a predetermined amount is deflected in the horizontal and vertical directions by the vertical deflection coil 8b, and the fluorescent film (not shown) formed on the inner surface of the panel 2 is scanned to display a desired image. The deflection amplitude at this time is proportional to the square root of the voltage applied to the anode button 5.

【０００６】[0006]

【発明が解決しようとする課題】従来の陰極線管は以上
のように構成されているので、偏向ヨーク８で電子銃３
により出射された電子ビームを偏向する際に、偏向ヨー
ク８を中心に放射状に発生し、陰極線管のファンネル部
およびパネル部を透過して、陰極線管の前方に放射され
人体に害を与えるという問題点があった。Since the conventional cathode ray tube is constructed as described above, the deflection yoke 8 is used for the electron gun 3.
When the electron beam emitted by the is deflected, it is generated radially around the deflection yoke 8, passes through the funnel portion and the panel portion of the cathode ray tube, is emitted in front of the cathode ray tube, and is harmful to the human body. There was a point.

【０００７】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、偏向ヨークで発生して陰極線管
の前方に放射される交番電界を抑制し、安全性の高い陰
極線管を提供することを目的とするものである。The present invention has been made to solve the above problems, and provides a highly safe cathode ray tube by suppressing the alternating electric field generated in the deflection yoke and radiated in front of the cathode ray tube. The purpose is to do.

【０００８】[0008]

【課題を解決するための手段】この発明に係る陰極線管
は、ファンネル部のコーン部からネック部にかけての外
表面を覆うように、ファンネル本体部の表面に形成され
た導電膜と導通する第２の導電膜を形成するとともに、
偏向ヨークの水平偏向コイル外表面を絶縁部材で覆った
ものである。The cathode ray tube according to the present invention is electrically connected to the conductive film formed on the surface of the funnel body so as to cover the outer surface of the funnel portion from the cone portion to the neck portion. While forming the conductive film of
The outer surface of the horizontal deflection coil of the deflection yoke is covered with an insulating member.

【０００９】[0009]

【作用】この発明における陰極線管の第２の導電膜は、
偏向ヨークの開口部内周面に０Ｖの等電位面、すなわち
電界シールド面を形成し、ファンネル部およびパネル部
を透過して陰極線管前面に放射される交番電界を抑制す
る。The second conductive film of the cathode ray tube according to the present invention is
An equipotential surface of 0 V, that is, an electric field shield surface is formed on the inner peripheral surface of the opening of the deflection yoke to suppress an alternating electric field transmitted through the funnel portion and the panel portion and radiated to the front surface of the cathode ray tube.

【００１０】[0010]

【実施例】【Example】

実施例１．以下、この発明の実施例を図について説明す
る。図１はこの発明の実施例１における陰極線管の構成
を示す図、図２は図１における陰極線管の要部を構成す
る偏向ヨークを示す斜視図、図３は図２における偏向ヨ
ークの要部を構成する水平偏向コイルを示す斜視図であ
る。図において、図４ないし図６に示す従来の陰極線管
と同様な部分は同一符号を付して説明を省略する。Example 1. Embodiments of the present invention will be described below with reference to the drawings. 1 is a diagram showing a configuration of a cathode ray tube according to Embodiment 1 of the present invention, FIG. 2 is a perspective view showing a deflection yoke constituting a main portion of the cathode ray tube in FIG. 1, and FIG. 3 is a main portion of the deflection yoke in FIG. FIG. 3 is a perspective view showing a horizontal deflection coil that constitutes In the figure, the same parts as those of the conventional cathode ray tube shown in FIGS. 4 to 6 are designated by the same reference numerals and the description thereof is omitted.

【００１１】９はファンネル部１のコーン部１ｂからネ
ック部１ａの一部にかけた領域の外表面に黒鉛を塗布し
て形成された第２の導電膜で、一端はファンネル本体部
１ｃの外表面に形成された導電膜７と導通されている。
１０は図２に示す偏向ヨーク８の水平偏向コイル８ａの
外表面全体を、図３に示すように、まんべんなく覆うシ
リコンゴムでなる絶縁部材で、第２の導電膜９と水平偏
向コイル８ａとを電気的に絶縁するために設けられてい
る。Reference numeral 9 is a second conductive film formed by coating graphite on the outer surface of the region extending from the cone portion 1b of the funnel portion 1 to a part of the neck portion 1a. One end of the second conductive film is the outer surface of the funnel body portion 1c. It is electrically connected to the conductive film 7 formed in.
Reference numeral 10 denotes an insulating member made of silicon rubber that covers the entire outer surface of the horizontal deflection coil 8a of the deflection yoke 8 shown in FIG. 2, as shown in FIG. 3, and the second conductive film 9 and the horizontal deflection coil 8a. It is provided for electrical insulation.

【００１２】上記のように構成されたこの発明の実施例
１における陰極線管によれば、コーン部１ｂからネック
部１ａの一部にかけた領域の外表面に形成された第２の
導電膜９が、導電膜７を介して接地されているので、第
２の導電膜９が０Ｖの等電位面となり、偏向ヨーク８の
開口部前面領域に電界シールド効果を持つ面が形成さ
れ、偏向ヨーク８により発生しファンネル部１を通過す
る交番電界を低減することができ、又、偏向ヨーク８の
水平偏向コイル８ａと第２の導電膜９とは、水平偏向コ
イル８ａの外表面を覆う絶縁部材によって良好に絶縁さ
れた状態となっているので、偏向ヨーク８と第２の導電
膜９との間に放電が発生するという問題も起こらない。According to the cathode ray tube of the first embodiment of the present invention configured as described above, the second conductive film 9 formed on the outer surface of the region extending from the cone portion 1b to a part of the neck portion 1a is formed. Since it is grounded via the conductive film 7, the second conductive film 9 becomes an equipotential surface of 0 V, and a surface having an electric field shield effect is formed in the front area of the opening of the deflection yoke 8. The alternating electric field generated and passing through the funnel portion 1 can be reduced, and the horizontal deflection coil 8a of the deflection yoke 8 and the second conductive film 9 are preferably formed by an insulating member that covers the outer surface of the horizontal deflection coil 8a. Since it is in an insulated state, there is no problem that discharge is generated between the deflection yoke 8 and the second conductive film 9.

【００１３】実施例２．尚、上記実施例１によれば、コ
ーン部１ｂからネック部１ａの一部にかけた領域の外表
面に設けられた第２の導電膜９として、黒鉛を塗布して
形成したものを説明したが、例えばアルミ等の金属を蒸
着によって形成しても、上記実施例１と同様な効果を奏
する。Embodiment 2. Although the second conductive film 9 provided on the outer surface of the region extending from the cone portion 1b to a part of the neck portion 1a is formed by applying graphite according to the first embodiment, it has been described. Even if a metal such as aluminum is formed by vapor deposition, the same effect as that of the first embodiment can be obtained.

【００１４】実施例３．又、上記各実施例によれば、偏
向ヨーク８の水平偏向コイル８ａの外表面を覆う絶縁部
材１０として、シリコンゴムを適用した場合について説
明したが、これに限定されるものではなく、例えばエポ
キシ等の樹脂を用いても良く、上記各実施例と同様の効
果を奏することは言うまでもない。Example 3. Further, according to each of the above-described embodiments, the case where the silicone rubber is applied as the insulating member 10 which covers the outer surface of the horizontal deflection coil 8a of the deflection yoke 8 has been described, but the present invention is not limited to this and, for example, an epoxy is used. Needless to say, other resins such as the above may be used, and the same effects as those of the above-described respective examples can be obtained.

【００１５】[0015]

【発明の効果】以上のように、この発明によればファン
ネル部のコーン部からネック部にかけての外表面を覆う
ように、ファンネル本体部の表面に形成された導電膜と
導通する第２の導電膜を形成するとともに、偏向ヨーク
の水平偏向コイル外表面を絶縁部材で覆ったので、偏向
ヨークで発生して陰極線管の前方に放射される交番電界
を抑制し、安全性の高い陰極線管を提供することが可能
になる。As described above, according to the present invention, the second conductive film which is electrically connected to the conductive film formed on the surface of the funnel body so as to cover the outer surface of the funnel portion from the cone portion to the neck portion. Since the film is formed and the outer surface of the horizontal deflection coil of the deflection yoke is covered with an insulating member, the alternating electric field generated in the deflection yoke and radiated in front of the cathode ray tube is suppressed to provide a highly safe cathode ray tube. It becomes possible to do.

【図面の簡単な説明】[Brief description of drawings]

【図１】この発明の実施例１における陰極線管の構成を
一部破断して示す図である。FIG. 1 is a partially cutaway view showing the structure of a cathode ray tube according to a first embodiment of the present invention.

【図２】図１における陰極線管の要部を構成する偏向ヨ
ークを示す斜視図である。FIG. 2 is a perspective view showing a deflection yoke forming a main part of the cathode ray tube in FIG.

【図３】図２における偏向ヨークの要部を構成する水平
偏向コイルを示す斜視図である。FIG. 3 is a perspective view showing a horizontal deflection coil forming a main part of the deflection yoke in FIG.

【図４】従来の陰極線管の構成を一部破断して示す図で
ある。FIG. 4 is a partially cutaway view showing the structure of a conventional cathode ray tube.

【図５】図４における陰極線管の要部を構成する偏向ヨ
ークを示す斜視図である。5 is a perspective view showing a deflection yoke forming a main part of the cathode ray tube in FIG.

【図６】図４における陰極線管に図５に示す偏向ヨーク
を装着した状態を示す図である。6 is a diagram showing a state in which the deflection yoke shown in FIG. 5 is mounted on the cathode ray tube in FIG.

【符号の説明】[Explanation of symbols]

１ ファンネル部 １ａ ネック部 １ｂ コーン部 １ｃ ファンネル本体部 ２ パネル部（フェースパネル） ３ 電子銃 ７ 導電膜 ８ 偏向ヨーク ８ａ 水平偏向コイル ８ｂ 垂直偏向コイル ８ｃ 偏向ヨーク本体部 ９ 第２の導電膜 １０ 絶縁部材 1 Funnel Part 1a Neck Part 1b Cone Part 1c Funnel Main Part 2 Panel Part (Face Panel) 3 Electron Gun 7 Conductive Film 8 Deflection Yoke 8a Horizontal Deflection Coil 8b Vertical Deflection Coil 8c Deflection Yoke Main Body 9 Second Conductive Film 10 Insulation Element

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 内部に電子銃が封止されたネック部と、
外表面の一部に静電容量付加のための接地された導電膜
が形成されたファンネル本体部と、上記ネック部と上記
ファンネル本体部とを連結するコーン部とからなるファ
ンネル部、内面に蛍光膜面を有し上記ファンネル本体部
の上記コーン部と連結される側とは異なる側の一端に連
結されるフェースパネル、上記ファンネル部の上記コー
ン部から上記ネック部にかけて嵌装され上記電子銃から
出射される電子ビームを偏向する偏向ヨークでなる陰極
線管において、上記ファンネル部の上記コーン部から上
記ネック部にかけての外表面を覆うように上記導電膜と
導通する第２の導電膜を形成するとともに、上記偏向ヨ
ークの水平偏向コイル外表面を絶縁部材で覆ったことを
特徴とする陰極線管。1. A neck portion in which an electron gun is sealed,
Fluorescent light on the inner surface of the funnel body, which is composed of a funnel body formed with a grounded conductive film for adding capacitance on a part of the outer surface, and a cone connecting the neck and the funnel body. A face panel that has a film surface and is connected to one end of the funnel body that is different from the side that is connected to the cone, and a face panel that is fitted from the cone to the neck of the funnel to the electron gun. In the cathode ray tube including the deflection yoke that deflects the emitted electron beam, a second conductive film that is electrically connected to the conductive film is formed so as to cover the outer surface of the funnel portion from the cone portion to the neck portion. A cathode ray tube characterized in that the outer surface of the horizontal deflection coil of the deflection yoke is covered with an insulating member.