JPS61224245A - Color picture tube - Google Patents

Color picture tube

Info

Publication number
JPS61224245A
JPS61224245A JP6090985A JP6090985A JPS61224245A JP S61224245 A JPS61224245 A JP S61224245A JP 6090985 A JP6090985 A JP 6090985A JP 6090985 A JP6090985 A JP 6090985A JP S61224245 A JPS61224245 A JP S61224245A
Authority
JP
Japan
Prior art keywords
shadowmask
aluminum
shadow mask
picture tube
color picture
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
Application number
JP6090985A
Other languages
Japanese (ja)
Inventor
Kiyoshi Tokita
清 時田
Kinji Kida
木田 金治
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP6090985A priority Critical patent/JPS61224245A/en
Publication of JPS61224245A publication Critical patent/JPS61224245A/en
Pending legal-status Critical Current

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  • Physical Vapour Deposition (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

PURPOSE:To improve degradation of color purity such as shifted color or uneven color by providing a grey black film composed of aluminum-ferro metallic compound onto at least one main face of shadowmask thereby easily reducing doming of shadowmask at initial operating stage. CONSTITUTION:Main face at the electron gun side of shadowmask arranged near the screen 4 while facing is applied with aluminum to execute blackening. The aluminum is deposited onto the surface of shadowmask at the electron gun side in a vacuum chamber upon formation of the shadowmask into spherical face through plastic machining and executing degreasing through tricren. Upon heating in hydrogen furnace, iron and aluminum are dispersed each other to produce porous grey black aluminum-ferro metallic compound such as FeAl3, Fe2Al5, FeAl2 on the surface of shadowmask. The shadowmask having such compound layer has high thermal conductivity and thermal radiation rate on the surface thus to enable effective conduction of heat produced through collision of electron beam to the circumferential portion or to radiate from the surface of shadowmask.

Description

【発明の詳細な説明】 〔発明の技術分野〕 本発明はシャドウマスク型カラー受像管に係わり、特に
そのシャドウマスクに関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a shadow mask type color picture tube, and particularly to its shadow mask.

〔発明の技術的背景と問題点〕[Technical background and problems of the invention]

一般にシャドウマスク型カラー受像管は第1図に示すよ
うに典型的には硝子で形成された外囲器は、実質的に矩
形状のパネル(1)と漏斗状のファンネル(2)とネッ
ク(3)とから構成される。そしてパネル(1)の内面
には赤、緑及び青に夫々発光する例えばストライプ状螢
光体スクリーン(4)が設けられ1、 一方ネツク(3
)にはパネル(1)の水平軸線に沿って一列に配列され
赤、緑及び青に対応する3本の電子ビーム(10)を射
出するいわゆるインライン型電子銃(6)が内設されて
いる。またスクリーン(4)に近接対向して多数の透孔
の穿設された主面を有するシャドウマスク(5)が配設
される。シャドウマスク(5)の周辺部はパネル外形に
対応して折り曲げられたスカート部(8)を有し、この
スカート部(8)は断面り字型の枠からなるマスクフレ
ーム(力によって支持固定され、さらにマスクフレーム
(力はスプリング(9)を介してパネル(1)内側壁に
埋め込まれたピン(図示せず)で係止めされている。こ
のようなカラー受像管において、電子銃(6)から射出
された3本の電子ビームa〔はファンネル(2)近傍の
外部に配置された偏向装置αυによって偏向され、実質
的に矩形状のパネル(1)に対応する矩形状の範囲を走
査するように且つシャドウマスク(5)の透孔を介して
色選別され、各色発光ストライプ状螢光体に正しく対応
射突せしめてカラー映像を現出させる。ここでシャドウ
マスク(5)の透孔な通過する有効電子ビーム量はその
機構上1/3以下であり、残りの電子ビームはシャドウ
マスクに射突し熱エネルギーに変換され時として800
程度迄シャドウマスクを加熱させる。シャドウマスク(
5)は一般にO〜100Cでの熱膨張係数が1.2X1
0/icと大きい鉄を主成分とするいわゆる冷間圧延鋼
からなる厚さ0.1H〜0.3+o+の薄板から形成さ
れており、このシャドウマスク(5)のスカート部(8
)を支持するマスクフレーム(力は厚さ1胴前後の強固
な断面り型の黒化処理を施こされた同じく冷間圧延鋼か
ら形成されている。従って加熱されたシャドウマスク(
5)は容易に熱膨張を生ずるが、その周辺部は黒化処理
を施こされた熱容量の大きなマスクフレーム(7)に対
接しているため輻射や伝導によりシャドウマスク周辺か
らマスクフレームに熱が移動し、シャドウマスク周辺の
温度が中央部よりも低くなる。このためシャドウマスク
(5)の中央部と周辺部に温度差を生じ相対的に中央部
を主体として加熱膨張されたいわゆるドーミング現象を
生ずる。この結果シャドウマスク(5)と螢光体スクリ
ーン(4)との距離が変化し電子ビームの正確なランデ
ィングが乱され色純度の劣化を生ずる。このような現象
は特にカラー受像管の動作初期において顕著である。
In general, a shadow mask type color picture tube, as shown in Fig. 1, has an envelope typically made of glass, consisting of a substantially rectangular panel (1), a funnel-shaped funnel (2), and a neck (2). 3). The inner surface of the panel (1) is provided with, for example, a striped phosphor screen (4) that emits red, green, and blue light respectively.
) is equipped with so-called in-line electron guns (6) that are arranged in a line along the horizontal axis of the panel (1) and emit three electron beams (10) corresponding to red, green, and blue. . Further, a shadow mask (5) having a main surface with a large number of through holes is arranged close to and opposite to the screen (4). The peripheral part of the shadow mask (5) has a skirt part (8) that is bent according to the outer shape of the panel. , furthermore, the mask frame (the force is locked by a pin (not shown) embedded in the inner wall of the panel (1) via a spring (9). In such a color picture tube, the electron gun (6) The three electron beams a[ emitted from the funnel (2) are deflected by a deflection device αυ placed outside, and scan a substantially rectangular range corresponding to the rectangular panel (1). The colors are sorted through the holes in the shadow mask (5), and a color image is created by correctly colliding with the striped phosphors of each color. Due to its mechanism, the effective amount of electron beam passing through is less than 1/3, and the remaining electron beam impinges on the shadow mask and is converted into thermal energy.
Heat the shadow mask to a certain degree. Shadow mask (
5) generally has a thermal expansion coefficient of 1.2X1 at O to 100C.
The skirt part (8
) supporting the mask frame (the mask frame is made of the same cold-rolled steel with a strong cross-sectional blackening treatment and is about 1 cylindrical thick. Therefore, the heated shadow mask (
5) easily causes thermal expansion, but since its peripheral area is in contact with the mask frame (7), which has a large heat capacity and has been subjected to blackening treatment, heat is transferred from the area around the shadow mask to the mask frame due to radiation and conduction. The temperature around the shadow mask becomes lower than the center. For this reason, a temperature difference occurs between the central portion and the peripheral portion of the shadow mask (5), resulting in a so-called doming phenomenon in which the central portion is relatively heated and expanded. As a result, the distance between the shadow mask (5) and the phosphor screen (4) changes, disturbing the accurate landing of the electron beam and causing deterioration of color purity. This phenomenon is particularly noticeable in the early stages of operation of a color picture tube.

このようなカラー受像管の動作初期におけるドーミング
現象に対しては、シャドウマスクの中央部からの熱の放
射の促進やシャドウマスクへの熱伝導の阻止という観点
より多数の提案がなされている。例えば、米国特許第2
826538号ではシャドウマスクの熱放射を促進すべ
くシャドウマスクの表面に黒鉛よりなる黒色層を設ける
提案がなされている。このようなカラー受像管ではこの
黒鉛層が皮孔な放熱器として作用するのでシャドウマス
クの温度は低下する。しかし、この黒鉛より成る黒色層
は、−面次のような欠点も有している。すなわち、カラ
ー受像管の製造工程中の熱工程での熱サイクルにより黒
色層の密着性が劣化し、カラー受像管に振動が与えられ
ると一部が剥離して微小片が脱落することがある。この
ようにして生じた脱落黒色層はシャドウマスクに付着す
ると孔詰りを生じてけい光面における画像特性を劣化さ
せ、また電子銃に付着すると、電極間のスパークを誘発
して耐電圧特性を劣化させるなどカラー受像管の品質を
著しく低下させる。また第二の例として特開昭50−4
4771号公報ではシャドウマスクの電子銃側に、たと
えば二酸化マンガンで構成される多孔質層を堆積し、そ
の上にアルミニウム層を、更にこのアルミニウム層上に
酸化ニッケルまたはニッケル鉄層をそれぞれ真空蒸着す
る構造のものが提案されている。このような構成のもの
を採用すると、多孔質層の熱伝導率係数は極めて小さい
ので電子ビームの衝突面で発生した熱はマスクに伝達さ
れずマスクから遠ざかる方向に放射される。
To deal with such a doming phenomenon in the early stages of operation of a color picture tube, many proposals have been made from the viewpoint of promoting radiation of heat from the center of the shadow mask and preventing heat conduction to the shadow mask. For example, U.S. Pat.
No. 826,538 proposes providing a black layer made of graphite on the surface of the shadow mask in order to promote heat radiation from the shadow mask. In such a color picture tube, the graphite layer acts as a porous heat radiator, thereby lowering the temperature of the shadow mask. However, this black layer made of graphite also has drawbacks such as -dimensionality. That is, the adhesion of the black layer deteriorates due to thermal cycles in the thermal process during the manufacturing process of the color picture tube, and when vibrations are applied to the color picture tube, a part of the black layer may peel off and minute pieces may fall off. If the black layer generated in this way adheres to the shadow mask, it will clog the pores and deteriorate the image characteristics on the fluorescent surface, and if it adheres to the electron gun, it will induce sparks between the electrodes and deteriorate the withstand voltage characteristics. The quality of the color picture tube will be significantly degraded. Also, as a second example, JP-A-50-4
In Japanese Patent No. 4771, a porous layer made of manganese dioxide, for example, is deposited on the electron gun side of the shadow mask, an aluminum layer is deposited on top of the porous layer, and a nickel oxide or nickel iron layer is further vacuum-deposited on the aluminum layer. structure has been proposed. When such a configuration is adopted, the heat generated at the collision surface of the electron beam is not transmitted to the mask but is radiated away from the mask because the thermal conductivity coefficient of the porous layer is extremely small.

このため、シャドウマスクの温度の上昇を効果的に抑制
することができる。しかし、このシャドウマスク面上に
三重の層を設けるためには、膨大な、設備と作業時間が
必要となり工業的量産性に著しく欠けると云う欠点があ
る。
Therefore, an increase in the temperature of the shadow mask can be effectively suppressed. However, in order to provide three layers on the surface of this shadow mask, a huge amount of equipment and working time are required, and there is a drawback that industrial mass production is significantly lacking.

〔発明の目的〕[Purpose of the invention]

本発明は以上の点に鑑みてなされたもので、動作初期に
おけるシャドウマスクのドーミングを小さくし画像の色
ずれ等による色純度の劣化を防止した工業的量産性に富
むカラー受像管を提供することを目的とする。
The present invention has been made in view of the above points, and it is an object of the present invention to provide a color picture tube that is highly industrially mass-producible and that reduces doming of the shadow mask at the initial stage of operation, prevents deterioration of color purity due to color shift of images, etc. With the goal.

〔発明の概要〕[Summary of the invention]

本発明はスクリーンに近接しその主面に多数の透孔な有
するシャドウマスクとこのシャドウマスクを介してスク
リーン上の螢光体を発光せしめる電子ビームを射出する
電子銃を少なくとも備えたカラー受像管において、この
シャドウマスクの主面の少なくとも一力にアルミ−鉄金
属間化合物からなる黒灰色化膜を設けることにより、シ
ャドゥマスクの温度上昇を軽減してシャドウマスクの初
期動作状態におけるドーミングを抑制するカラー受像管
である。
The present invention provides a color picture tube that is provided with at least a shadow mask that is close to a screen and has a large number of through holes on its main surface, and an electron gun that emits an electron beam that causes a phosphor on the screen to emit light through the shadow mask. A color that reduces the temperature rise of the shadow mask and suppresses doming in the initial operating state of the shadow mask by providing a black-gray film made of an aluminum-iron intermetallic compound on at least one main surface of the shadow mask. It is a picture tube.

〔発明の実施例〕[Embodiments of the invention]

以下本発明について実施例に基き詳細に説明する。尚、
本発明のカラー受像管の部材構成自体は第1図に示すも
のと同様であるので詳細な説明は省略する。
The present invention will be described in detail below based on examples. still,
The component structure of the color picture tube of the present invention itself is the same as that shown in FIG. 1, so detailed explanation will be omitted.

第1図に示すようなカラー受像管に於いて、スクリーン
(4)に近接対向して配設されるシャドウマスク(5)
の電子銃側の主面にアルミニウムを被覆して黒化処理を
施しである。このアルミニウムは、シャドウマスクが塑
性加工により球面を形成し、トリクレン等により脱脂さ
れた後、真空チャンバー内でシャドウマスクの電子銃側
表面に約10μmの厚さで蒸着される。その後、このン
ヤドクマスクを最高温度が約700Cで約30分保持す
る水素炉で加熱すると、シャドウマスクの鉄とアルミニ
ウムが相互に拡散してシャドウマスクの表面に、ポーラ
スな黒灰色のアルミ−鉄金属間化合物、例えば、F e
 A4 + F e2 A4 、 F e A4を生じ
る。このようなポーラスな黒灰色のアルミ−鉄金属間化
合物層を有したシャドウマスクは、その表面が熱伝導性
、熱輻射率が蔦<、電子ビームの射突によって生じた熱
を効果的周辺部に伝導したり、シャドウマスク表面より
放射させることができる。本発明者らが21吋型カラー
受像管で実験したところ、厚さ0.22mmの冷間圧延
鋼板のシャドウマスクの原子銃側表面に約10μmのア
ルミニウム層を形成し、アルミ−鉄金属間化合物からな
る黒化膜を有するシャドウマスクは従来のマスクに比べ
約20チドーミングによる電子ビームの変位量が少ない
ことが確認された。また、このようなシャドウマスクは
その電子銃側表面にシャドウマスクの主成分である鉄よ
り原子番号の小さいアルミニウムが存在するため、そこ
に衝突した電子ビームが後方へ散乱される確率は非常に
低く、螢光面の不要発光を著しく抑制することができ、
コントラストの良い画像を得ることができる。一方、こ
のアルミ−鉄金属間化合物は、鉄中の酸素をアルミニウ
ムと結合させA7. O,となる働きも促進するため、
その表面からのガス放出も極めて小さいことが判明し寿
命特性の良いカラー受像管が期待できる。
In a color picture tube as shown in Fig. 1, a shadow mask (5) is arranged close to and opposite to the screen (4).
The main surface on the electron gun side is coated with aluminum and subjected to blackening treatment. After the shadow mask is formed into a spherical surface by plastic working and degreased with trichloride or the like, aluminum is deposited to a thickness of about 10 μm on the electron gun side surface of the shadow mask in a vacuum chamber. Then, when this Nyadoku mask is heated in a hydrogen furnace with a maximum temperature of about 700C and maintained for about 30 minutes, the iron and aluminum of the shadow mask will diffuse into each other and a porous black-gray aluminum-iron metal layer will appear on the surface of the shadow mask. Compounds, e.g. Fe
A4 + F e2 A4 , yielding F e A4. A shadow mask with such a porous black-gray aluminum-iron intermetallic compound layer has a thermally conductive surface and a thermal emissivity of 100%, which effectively transfers the heat generated by the impact of the electron beam to the surrounding area. It can be conducted to the surface of the shadow mask or emitted from the surface of the shadow mask. The present inventors conducted an experiment using a 21-inch color picture tube, and found that an aluminum layer of about 10 μm was formed on the atomic gun side surface of a cold-rolled steel plate shadow mask with a thickness of 0.22 mm, and an aluminum-iron intermetallic compound was formed. It has been confirmed that the shadow mask having a blackened film made of the above has a smaller displacement of the electron beam due to doming by about 20 degrees than the conventional mask. In addition, since such a shadow mask has aluminum, which has a lower atomic number than iron, which is the main component of the shadow mask, on its electron gun side surface, the probability that an electron beam that collides with it will be scattered backwards is extremely low. , it is possible to significantly suppress unnecessary light emission from the fluorescent surface,
Images with good contrast can be obtained. On the other hand, this aluminum-iron intermetallic compound combines oxygen in iron with aluminum to form A7. In order to promote the function of O,
It has been found that the gas released from the surface is extremely small, and a color picture tube with good life characteristics can be expected.

ここで、本実施例においては、シャドウマスクの電子銃
側表面のみにアルミニウムの黒化処理を施すものとして
説明したが、シャドウマスクのスクリーン側表面のみで
もその効果は充分有している。勿論、シャドウマスクの
両面に施せば、さらに高い効果が期待できることは云う
までもない。
In this embodiment, although the aluminum blackening treatment is applied only to the surface of the shadow mask on the electron gun side, the effect is sufficiently obtained even if only the surface of the shadow mask on the screen side is applied. Of course, it goes without saying that even higher effects can be expected if applied to both sides of the shadow mask.

また、本実施例においては、アルミニウムを真空蒸着し
たものとして説明したが本発明の主旨は、本実施例に限
られるものでなく、他の方法、例えば溶融メッキでもそ
の効果は充分得られる。更に本発明によるシャドウマス
クは、前述の従来例、米国特許第2826538号や特
開昭50−44771号に示された黒鉛層や二酸化マン
ガン層と異なり、シャドウマスクとアルミニウムが化学
的に結合しているためその結合は極めて強く、カラー受
像管内で脱落するようなことは極めて少ない。
Further, in this embodiment, aluminum is vacuum-deposited, but the gist of the present invention is not limited to this embodiment, and the effect can be sufficiently obtained by other methods, such as hot-dip plating. Furthermore, the shadow mask according to the present invention differs from the graphite layer and manganese dioxide layer shown in the conventional examples described above, such as U.S. Pat. Because of this, the bond is extremely strong, and it is extremely unlikely that it will fall off inside the color picture tube.

〔発明の効果〕〔Effect of the invention〕

以上のように本発明によれば、製造設備及び作業工程が
大巾に増加することなく、動作初期におけるシャドウマ
スクのドーミングを容易1−減少させることができ、色
ずれや色むら等の色純度の劣化を改善することができ、
工業的価値は極めて高い。
As described above, according to the present invention, it is possible to easily reduce doming of the shadow mask at the initial stage of operation without significantly increasing the number of manufacturing equipment and work processes, and to reduce color purity such as color shift and color unevenness. can improve the deterioration of
Its industrial value is extremely high.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はカラー受像管の構成を示す概略断面図である。 (1)・・・ハネル    (2)・・・ファンネル(
3)・・・ネック    (4)・・・スクリーン(5
)・・・シャドウマスク (6)・・・電子銃(力・・
・フレーム
FIG. 1 is a schematic sectional view showing the structure of a color picture tube. (1)...Hanel (2)...Funnel (
3)...Neck (4)...Screen (5)
)...Shadow Mask (6)...Electron Gun (Power...
·flame

Claims (1)

【特許請求の範囲】 1)スクリーンに近接し多数の透孔の穿設されたシャド
ウマスクとこのシャドウマスクを介して前記スクリーン
上の螢光体を選択発光せしめる電子ビームを射出する電
子銃とを少なくとも備えたカラー受像管において、前記
シャドウマスクの少なくとも一方の表面にアルミ−鉄金
属間化合物からなる黒灰色化膜を有することを特徴とす
るカラー受像管。 2)前記黒灰色化膜が、アルミの真空蒸着膜より形成さ
れたことを特徴とする特許請求の範囲第1項記載のカラ
ー受像管。 3)前記黒灰色化膜がアルミの溶融メッキにより形成さ
れたことを特徴とする特許請求の範囲第1項記載のカラ
ー受像管。
[Scope of Claims] 1) A shadow mask that is close to a screen and has a large number of through holes, and an electron gun that emits an electron beam that selectively causes phosphors on the screen to emit light through the shadow mask. What is claimed is: 1. A color picture tube comprising at least one of the shadow masks, wherein at least one surface of the shadow mask has a blackish-gray film made of an aluminum-iron intermetallic compound. 2) The color picture tube according to claim 1, wherein the black-gray film is formed from a vacuum-deposited aluminum film. 3) The color picture tube according to claim 1, wherein the black-gray film is formed by hot-dip aluminum plating.
JP6090985A 1985-03-27 1985-03-27 Color picture tube Pending JPS61224245A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6090985A JPS61224245A (en) 1985-03-27 1985-03-27 Color picture tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6090985A JPS61224245A (en) 1985-03-27 1985-03-27 Color picture tube

Publications (1)

Publication Number Publication Date
JPS61224245A true JPS61224245A (en) 1986-10-04

Family

ID=13155966

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6090985A Pending JPS61224245A (en) 1985-03-27 1985-03-27 Color picture tube

Country Status (1)

Country Link
JP (1) JPS61224245A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02270249A (en) * 1989-04-10 1990-11-05 Nkk Corp Metallic thin-plate for shadow mask and its manufacture
JPH02270248A (en) * 1989-04-10 1990-11-05 Nkk Corp Metallic thin-plate for shadow mask and its manufacture

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50115766A (en) * 1974-02-22 1975-09-10

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50115766A (en) * 1974-02-22 1975-09-10

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02270249A (en) * 1989-04-10 1990-11-05 Nkk Corp Metallic thin-plate for shadow mask and its manufacture
JPH02270248A (en) * 1989-04-10 1990-11-05 Nkk Corp Metallic thin-plate for shadow mask and its manufacture

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