JPH0467732B2 - - Google Patents
Info
- Publication number
- JPH0467732B2 JPH0467732B2 JP22403983A JP22403983A JPH0467732B2 JP H0467732 B2 JPH0467732 B2 JP H0467732B2 JP 22403983 A JP22403983 A JP 22403983A JP 22403983 A JP22403983 A JP 22403983A JP H0467732 B2 JPH0467732 B2 JP H0467732B2
- Authority
- JP
- Japan
- Prior art keywords
- shadow mask
- glass
- picture tube
- color picture
- manufacturing
- 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.)
- Expired
Links
- 239000011521 glass Substances 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 238000010894 electron beam technology Methods 0.000 claims description 9
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims 2
- 230000006698 induction Effects 0.000 claims 1
- ZPPSOOVFTBGHBI-UHFFFAOYSA-N lead(2+);oxido(oxo)borane Chemical compound [Pb+2].[O-]B=O.[O-]B=O ZPPSOOVFTBGHBI-UHFFFAOYSA-N 0.000 description 24
- 239000005385 borate glass Substances 0.000 description 23
- 239000010960 cold rolled steel Substances 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 239000000020 Nitrocellulose Substances 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 229920001220 nitrocellulos Polymers 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
- H01J9/22—Applying luminescent coatings
- H01J9/227—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines
- H01J9/2271—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines by photographic processes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/14—Manufacture of electrodes or electrode systems of non-emitting electrodes
- H01J9/142—Manufacture of electrodes or electrode systems of non-emitting electrodes of shadow-masks for colour television tubes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/07—Shadow masks
- H01J2229/0727—Aperture plate
- H01J2229/0777—Coatings
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明はシヤドウマスク型カラー受像管の製造
方法に係わり、特にそのシヤドウマスクの形成方
法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 method for manufacturing a shadow mask type color picture tube, and particularly to a method for forming the shadow mask.
一般にシヤ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碍子で形成された外囲器
は、実質的に矩形状のパネル１と漏斗状のフアン
ネル２とネツク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
ばストライプ状蛍光体スクリーン４が設けられ、
一方ネツク３にはパネル１の水平軸線に沿つて一
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曲面状の主面を
有するシヤドウマスク５が配設される。シヤドウ
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Ｌ字型の枠からなるマスクフレーム７によ
つて支持固定され、さらにマスクフレーム７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１０はフアンネル２近傍の
外部に配置された偏向装置（図示せず）によつて
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ヤドウマス
ク５の透孔を介して色選別され、各色発光ストラ
イプ状蛍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。ここでシヤドウマスク５の透孔
を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ヤドウマスクに
射突し熱エネルギーに変換され時として80℃程度
迄シヤドウマスクを加熱させる。シヤドウマスク
５は一般に０〜100℃での熱膨張係数が1.2×
10-5／℃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0.1mm〜0.3mmの薄板から形成
されており、このシヤドウマスク５のスカート部
８を支持するマスクフレーム７は厚さ１mm前後の
強固な断面Ｌ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。従つて加熱された
シヤドウマスク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幅射や伝導
によりシヤドウマスク周辺からマスクフレームに
熱が移動し、シヤドウマスク周辺の温度が中央部
よりも低くなる。このためシヤドウマスク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。この結果シヤドウマスク５と蛍光体ス
クリーン４との距離が変化し電子ビームの正確な
ランデイ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。また映像面上で部分的に高輝度
の映像が映出され、特にこの高輝度映像部分が一
定時間以上停止している時は、シヤドウマスクに
高電子流密度の電子ビームが部分的に発生するこ
とになり、局部的なドーミング現象を生ずる。
In general, a shadow mask type color picture tube has an envelope typically made of an insulator, as shown in FIG. 1, consisting of a substantially rectangular panel 1, a funnel-shaped funnel 2, and a net 3. . For example, a striped phosphor screen 4 that emits red, green, and blue light is provided on the inner surface of the panel 1.
On the other hand, the net 3 is provided with so-called in-line electron guns 6 which 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 curved main surface with a large number of through holes is disposed 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.
is supported and fixed by a mask frame 7 having an L-shaped cross section, and further, the mask frame 7 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 three electron beams 10 emitted from the electron gun 6 are deflected by a deflection device (not shown) disposed outside near the funnel 2, and are deflected into a substantially rectangular shape. The colors are sorted so as to scan a rectangular area corresponding to the panel 1 and through the holes in the shadow mask 5, and the colors are projected onto the light-emitting striped phosphors of each color in the correct manner to reveal a color image. Due to its mechanism, the effective amount of electron beams passing through the holes in the shadow mask 5 is less than 1/3, and the remaining electron beams impinge on the shadow mask and are converted into thermal energy, sometimes heating the shadow mask up to about 80 degrees Celsius. . Shadow mask 5 generally has a thermal expansion coefficient of 1.2× at 0 to 100℃.
The mask frame 7 supporting the skirt portion 8 of the shadow mask 5 is made of a thin plate of 0.1 mm to 0.3 mm thick made of so-called cold-rolled steel whose main component is iron, which has a large temperature of 10 -5 /°C. It is also made of cold-rolled steel that has been subjected to blackening treatment and has a strong L-shaped cross section with a length of around 1 mm. Therefore, the heated shadow mask 5 easily undergoes thermal expansion, but since its periphery is in contact with the mask frame 7 which has been subjected to blackening treatment and has a large heat capacity, radiation and conduction cause the mask frame to expand from the periphery of the shadow mask. Heat moves to the area, and the temperature around the shadow mask becomes lower than the center. Therefore, 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. In addition, when a high-brightness image is partially projected on the image screen, and especially when this high-brightness image part is stopped for a certain period of time, an electron beam with a high electron flow density may be partially generated on the shadow mask. , causing a local doming phenomenon.
このようなカラー受像管のドーミング現象に対
しては、シヤドウマスク５の電子銃側の主面にガ
ラスを主体とする例えば鉛ほう酸塩ガラスからな
る層を形成し電子ビーム１０が射突する鉛ほう酸
塩ガラスで発生した熱をシヤドウマスク５へ伝達
するのを抑制する提案が本発明と同一出願人によ
り特願昭58−148843でなされている。 In order to prevent such a doming phenomenon in a color picture tube, a layer made of glass, for example, lead-borate glass, is formed on the main surface of the shadow mask 5 on the electron gun side. A proposal for suppressing the transmission of heat generated in the glass to the shadow mask 5 was made in Japanese Patent Application No. 148,843/1983 by the same applicant as the present invention.
この鉛ほう酸塩ガラス層は、パネル１とフアン
ネル２とが封着される前に、ニトロセルロースを
数％溶かした酢酸ブチルアルコール溶液で溶かさ
れた鉛ほう酸塩ガラスをシヤドウマスク５の電子
銃側に塗布、乾燥後このシヤドウマスク５をパネ
ル１内に装着する。そして、その後、パネル１と
フアンネル２を所定の枠台に乗せて、例えば10
℃／分の昇温速度をもつて温度を上げ、最高温度
が約440°でその保持時間が35分以上ある炉を通過
させると、シヤドウマスク５の電子銃側にガラス
化された鉛ほう酸塩ガラス層が形成できる。とこ
ろが、このような方法によつてシヤドウマスク５
にガラス層を形成する場合以下のような問題点を
有している。第１に、液状化した鉛ほう酸塩ガラ
スを塗布したシヤドウマスク５をパネル１内に装
着する場合、ガラスがパネル内に滴下して付着す
る。第２にパネルとフアンネル２を組み合せて10
℃／分の昇温速度で加熱する時に、まずニトロセ
ルロースを含んだ酢酸ブチルアルコール等のバイ
ンダーが分解して消散しその後炉内温度が440℃
の最高温度に達すると鉛ほう酸塩ガラスの結晶化
が始まるが、このバインダーが消散し鉛ほう酸塩
ガラスとシヤドウマスク５との結合が始まるまで
に炉内における振動等により鉛ほう酸塩ガラスが
シヤドウマスク５より離脱してフアンネル２に付
着する。これら付着した鉛ほう酸塩ガラスは、そ
の後の炉温により付着した場所で結晶化されカラ
ー受像管として完成後、スクリーン欠点や耐電圧
不良の要因となる可能性が強い。 For this lead-borate glass layer, before the panel 1 and the funnel 2 are sealed together, lead-borate glass dissolved in a butyl acetate alcohol solution containing several percent nitrocellulose is applied to the electron gun side of the shadow mask 5. After drying, this shadow mask 5 is installed inside the panel 1. After that, place panel 1 and funnel 2 on a predetermined frame, and
When the temperature is raised at a heating rate of °C/min and passed through a furnace with a maximum temperature of about 440° and a holding time of 35 minutes or more, vitrified lead-borate glass is formed on the electron gun side of the shadow mask 5. A layer can be formed. However, with this method, the shadow mask 5
When forming a glass layer on a glass layer, there are the following problems. Firstly, when the shadow mask 5 coated with liquefied lead borate glass is mounted inside the panel 1, the glass drips and adheres into the panel. Second, combine the panel and funnel 2 to 10
When heating at a heating rate of ℃/min, the binder such as acetic butyl alcohol containing nitrocellulose decomposes and dissipates, and then the temperature inside the furnace reaches 440℃.
When the maximum temperature is reached, the lead-borate glass begins to crystallize, but by the time the binder dissipates and the bond between the lead-borate glass and the shadow mask 5 begins, vibrations in the furnace cause the lead-borate glass to move away from the shadow mask 5. It separates and attaches to the funnel 2. These deposited lead-borate glasses are likely to crystallize at the deposited location due to the subsequent furnace temperature and become a cause of screen defects and voltage withstand defects after the color picture tube is completed.
本発明は以上の点に鑑みてなされたもので、シ
ヤ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の製造方法を提供することを
目的とする。
The present invention has been made in view of the above points, and an object of the present invention is to provide a method for manufacturing a color picture tube that reduces doming of the shadow mask, prevents deterioration of color purity due to color shift of images, etc., and is highly suitable for industrial mass production. purpose.
本発明はパネル内面に形成された蛍光体スクリ
ーンに近接しその主面に多数の透孔を有するシヤ
ドウマスクとこのシヤドウマスクとこのシヤドウ
マスクを介してスクリーン上の蛍光体を発光せし
める電子ビームを射出する電子銃を少なくとも備
えたカラー受像管の製造方法において、このシヤ
ドウマスクの主面の少なくとも一方にガラスを主
体とする層を形成する工程と、このシヤドウマス
クを加熱してガラスを半融化する工程と、この半
融化されたガラスを加熱して結晶化させる工程を
少なくとも備えることにより、シヤドウマスクの
温度上昇を軽減してシヤドウマスクのドーミング
を抑制することの可能な工業的量産性に富むカラ
ー受像管の製造方法である。
The present invention includes a shadow mask that is close to a phosphor screen formed on the inner surface of a panel and has a large number of through holes on its main surface, and an electron gun that emits an electron beam that causes the phosphor on the screen to emit light through the shadow mask and this shadow mask. A method for manufacturing a color picture tube comprising at least the steps of: forming a layer mainly made of glass on at least one of the main surfaces of the shadow mask; heating the shadow mask to semi-melt the glass; This method of manufacturing a color picture tube is highly industrially mass-producible and is capable of reducing the temperature rise of the shadow mask and suppressing doming of the shadow mask by at least the step of heating and crystallizing the glass.
以下本発明について実施例に基き詳細に説明す
る。尚、本発明に適用される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. The component structure of the color picture tube applied to the present invention 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のシヤドウマ
スクは露光法により選択的にエツチングすること
により多数の透孔が穿設される。次いで多数の透
孔を有する主面は曲面状に、周縁部は主面支持の
ためのスカート部にプレス成形されてシヤドウマ
スクの原型が完成する。このようなシヤドウマス
ク５は所定形状に形成された後、スクリーン４に
近接対向して配設される場合電子銃側の凹面とな
る主面にガラスを主体とする、例えば鉛ほう酸塩
ガラスからなる層が形成される。この鉛ほう酸塩
ガラス層は、パネル１とフアンネル２とが封着さ
れる前に、ニトロセルロースを数％溶かした酢酸
ブチルアルコール溶液で溶かされた鉛ほう酸塩ガ
ラスをシヤドウマスク５の電子銃側に塗布する。
そしてその後このシヤドウマスク５を加熱して鉛
ほう酸塩ガラスを半融化しシヤドウマスク５に仮
の固着の状態とする。ところで、一般に、金属と
ガラスが効果的に封着されるための条件の一つに
金属とガラスが良くなじむこと、すなわち相互に
濡れることが必要であり、本発明の場合のように
鉛ほう酸塩ガラスをシヤドウマスク５に仮に固着
する場合も同様な条件が必要となり、この条件を
満たす温度がガラスの軟化温度である。次にシヤ
ドウマスク５をこのガラスの軟化温度に昇温する
方法としては、火力、電気による炉方式では設備
が膨大になり、且つシヤドウマスク５が必要温度
になるまでに時間がかかり量産には不向である。
そこで本発明者は被着材料がシヤドウマスク５と
云う良導体であることに着目し種々実験した結
果、コイルに高周波電流を通しこのコイル内にシ
ヤドウマスク５を配置すれば、シヤドウマスク５
が良導体であるためシヤドウマスク５内に電磁誘
導で生ずる渦電流によつてシヤドウマスク５が極
めて短時間に高温にまで加熱できることを確認し
た。例えば厚さ0.18mmの冷間圧延鋼からなるシヤ
ドウマスク５の電子銃側主面にPbOが約75重量パ
ーセント、B2O3が約９重量パーセントを少なく
とも含んだ鉛ほう酸塩ガラスを塗布して、トラン
ス出力約15kvA、使用周波数約400KHzの高周波
電源に接続されたコイル内で加熱すると、シヤド
ウマスク５の温度が鉛ほう酸塩ガラスの軟化点
400℃に５秒以内で到達し、５分後には鉛ほう酸
塩ガラスが半融化してシヤドウマスクに固着して
いることが判明した。このように形成されたガラ
ス層は仮の固着とはいえ、化学結合によりシヤド
ウマスク５と接着しているため、従来のバイダー
による接着に比べ大幅に接着強度が向上してその
後の工程における脱落を極端に少なくすることが
できる。 A large number of holes are formed in the shadow mask of a color picture tube as shown in FIG. 1 by selectively etching it using an exposure method. Next, the main surface having a large number of through holes is press-molded into a curved shape, and the peripheral portion is press-molded into a skirt portion for supporting the main surface, thereby completing the prototype of the shadow mask. After such a shadow mask 5 is formed into a predetermined shape, a layer mainly made of glass, for example lead borate glass, is formed on the main surface which becomes a concave surface on the electron gun side when disposed close to and facing the screen 4. is formed. For this lead-borate glass layer, before the panel 1 and the funnel 2 are sealed together, lead-borate glass dissolved in a butyl acetate alcohol solution containing several percent nitrocellulose is applied to the electron gun side of the shadow mask 5. do.
Thereafter, the shadow mask 5 is heated to semi-melt the lead borate glass and temporarily fixed to the shadow mask 5. By the way, in general, one of the conditions for metal and glass to be effectively sealed is that the metal and glass should be compatible with each other, that is, they should get wet with each other, and as in the case of the present invention, lead borate Similar conditions are required when glass is temporarily fixed to the shadow mask 5, and the temperature that satisfies this condition is the softening temperature of the glass. Next, as a method for raising the temperature of the shadow mask 5 to the softening temperature of this glass, a furnace method using thermal power or electricity requires a huge amount of equipment, and it takes a long time for the shadow mask 5 to reach the required temperature, making it unsuitable for mass production. be.
Therefore, the inventor of the present invention focused on the fact that the material to be adhered to is a good conductor called the shadow mask 5, and as a result of various experiments, found that if a high frequency current is passed through the coil and the shadow mask 5 is placed inside this coil, the shadow mask 5
It was confirmed that since the shadow mask 5 is a good conductor, the shadow mask 5 can be heated to a high temperature in an extremely short time by the eddy current generated in the shadow mask 5 by electromagnetic induction. For example, a lead borate glass containing at least about 75% by weight of PbO and about 9% by weight of B 2 O 3 is coated on the electron gun side main surface of the shadow mask 5 made of cold rolled steel with a thickness of 0.18 mm. When heated in a coil connected to a high-frequency power supply with a transformer output of approximately 15 kVA and a working frequency of approximately 400 KHz, the temperature of the shadow mask 5 reaches the softening point of lead-borate glass.
It was found that the temperature reached 400°C within 5 seconds, and after 5 minutes, the lead-borate glass had become half-molten and had adhered to the shadow mask. Although the glass layer formed in this way is only temporarily attached, it is bonded to the shadow mask 5 through chemical bonding, so the adhesive strength is significantly improved compared to conventional binder bonding, making it extremely difficult to fall off during subsequent processes. can be reduced to
以上のようにガラス層を塗布し、半融化して仮
の固着の状態とした後、シヤドウマスク５をパネ
ル１内に装着する。その後、パネル１とフアンネ
ル２を所定の枠台に乗せて、最高温度が約440゜で
その結持時間が35分以上の熱処理炉を通過させる
と、シヤドウマスク５の電子銃側にガラス化され
た鉛ほう酸塩ガラス層が形成できる。この鉛ほう
酸塩ガラスはPbOの重量パーセントが44〜93％の
範囲でガラス化するが、結晶化に対し安定なのは
70〜85％であり、この範囲が量産に適している。
また、一般に金属とガラスを封着する場合ガラス
に無理な歪力がかからないようにすることが必要
である。ガラスではその圧縮強度が引つ張り強度
の約10倍であり、従つて封着後ガラスにわずかに
圧縮力が加わつている状態にすることがよいの
で、ガラスの熱膨張よりも封着金属のそれがわず
かに大きい方が好ましい。一般に冷間圧延鋼板よ
りなるシヤドウマスク５の熱膨張係数は約1.2×
10-5／℃であるが、前記PbOの重量パーセントが
70〜85％の鉛ほう酸塩ガラスの熱膨張係数は0.7
〜1.2×10-5／℃であり、冷間圧延鋼板のシヤド
ウマスクに封着するのに非常に適している。とこ
ろでこのような鉛ほう酸塩ガラスを結晶化するた
めには、400℃乃至600℃の最高温度とそれを30分
以上保持できる炉が必要であるが、この実施例の
ようにパネル１とフアンネル２との封着時に同時
に封着炉で結晶化すれば、或はシヤドウマスク５
とフレーム７を含めたシヤドウマスク構体のスタ
ビライズ工程で同時に結晶化すれば工業的に非常
に有利である。このように従来の熱処理炉条件で
最適化結晶させるため必要に応じて、ZnOやCuO
を鉛ほう酸塩ガラスに添加してもよい。この場
合、熱膨張係数をあまり変化させないでより低温
で結晶化させることが可能となる。 After applying the glass layer as described above and semi-melting it into a temporarily fixed state, the shadow mask 5 is mounted inside the panel 1. After that, the panel 1 and the funnel 2 are placed on a predetermined frame and passed through a heat treatment furnace with a maximum temperature of about 440° and a holding time of 35 minutes or more, so that the electron gun side of the shadow mask 5 is vitrified. A lead-borate glass layer can be formed. This lead-borate glass vitrifies at PbO weight percentages ranging from 44% to 93%, but is stable against crystallization.
It is 70-85%, and this range is suitable for mass production.
Furthermore, in general, when sealing metal and glass, it is necessary to prevent excessive strain from being applied to the glass. The compressive strength of glass is about 10 times the tensile strength, so it is better to have a slight compressive force applied to the glass after sealing. Preferably it is slightly larger. Generally, the thermal expansion coefficient of the shadow mask 5 made of cold rolled steel plate is approximately 1.2×
10 -5 /℃, but the weight percent of PbO is
The thermal expansion coefficient of 70-85% lead borate glass is 0.7
~1.2×10 -5 /°C, making it very suitable for sealing to a shadow mask made of cold rolled steel plate. By the way, in order to crystallize such lead borate glass, a maximum temperature of 400°C to 600°C and a furnace that can maintain it for more than 30 minutes are required. If it is crystallized in a sealing furnace at the same time as the sealing with the shadow mask 5,
It would be very advantageous industrially if the shadow mask structure including the frame 7 were crystallized at the same time in the stabilizing process. In order to achieve optimized crystallization under conventional heat treatment furnace conditions, ZnO and CuO
may be added to the lead borate glass. In this case, it becomes possible to crystallize at a lower temperature without significantly changing the coefficient of thermal expansion.
以上のようにして形成完成されたカラー受像管
を動作させた場合、電子ビームが射突する鉛ほう
酸塩ガラスで発生した熱は、鉛ほう酸塩ガラスの
熱伝導率が6W／ｍ・Ｋと冷間圧延鋼板のシヤド
ウマスクのそれの約１／８のためマスクに伝達さ
れる量が少なくなりシヤドウマスクの温度上昇を
効果的に抑制することができる。 When the color picture tube formed and completed as described above is operated, the heat generated in the lead-borate glass that the electron beam strikes will be absorbed by the lead-borate glass, which has a thermal conductivity of 6 W/m・K. Since the temperature is about 1/8 of that of the shadow mask made of inter-rolled steel plate, the amount transmitted to the mask is small, and the temperature rise of the shadow mask can be effectively suppressed.
以上のように本発明によれば、大規模な製造設
備や作業時間の増加を伴うことなく、シヤドウマ
スクのドーミングを効果的に軽減して色ずれや色
むら等の色純度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 effectively reduce doming of a shadow mask and improve color purity deterioration such as color shift and color unevenness without requiring large-scale manufacturing equipment or increasing work time. The industrial value is extremely high.
第１図はシヤドウマスク型カラー受像管の構成
を示す概略断面図である。
１……パネル、２……フアンネル、３……ネツ
ク、４……スクリーン、５……シヤドウマスク、
６……電子銃、７……フレーム。
FIG. 1 is a schematic sectional view showing the structure of a shadow mask type color picture tube. 1...Panel, 2...Funnel, 3...Network, 4...Screen, 5...Shadow mask,
6...Electron gun, 7...Frame.
Claims (1)
近接対向し多数の透孔の穿設された主面を有する
シヤドウマスクとこのシヤドウマスクを介して前
記スクリーン上の蛍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
ラー受像管の製造方法において、前記シヤドウマ
スクの少なくとも前記電子銃側の主面にガラスを
主体とする層を形成する工程と、前記ガラス層が
少なくとも半融化するまで加熱する工程と、前記
半融化されたガラス層を加熱焼結させる工程とを
少なくとも備えたことを特徴とするカラー受像管
の製造方法。 ２ 前記ガラス層を半融化する工程が前記ガラス
の実質的な軟化点温度で５分以上保持する工程か
らなることを特徴とする特許請求の範囲第１項記
載のカラー受像管の製造方法。 ３ 前記半融化されたガラスを加熱焼結させる工
程が前記シヤドウマスクを前記パネル内に装着し
た状態で行なわれる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の製造方法。 ４ 前記ガラス層を半融化させる工程の加熱方法
が高周波コイルによる高周波誘導加熱法であるこ
とを特徴とする特許請求の範囲第２項記載のカラ
ー受像管の製造方法。[Scope of Claims] 1. A shadow mask having a main surface with a large number of through holes, which is closely opposed to a phosphor screen formed on the inner surface of the panel, and selectively emitting light from the phosphor on the screen through this shadow mask. A method for manufacturing a color picture tube comprising at least an electron gun that emits an electron beam, the method comprising: forming a layer mainly made of glass on at least the main surface of the shadow mask on the electron gun side; A method for manufacturing a color picture tube, comprising at least the steps of heating until melted, and heating and sintering the semi-melted glass layer. 2. The method of manufacturing a color picture tube according to claim 1, wherein the step of semi-melting the glass layer comprises a step of holding the glass at a substantial softening point temperature for 5 minutes or more. 3. The method of manufacturing a color picture tube according to claim 1, wherein the step of heating and sintering the semi-melted glass is carried out with the shadow mask mounted inside the panel. 4. The method of manufacturing a color picture tube according to claim 2, wherein the heating method in the step of semi-melting the glass layer is a high frequency induction heating method using a high frequency coil.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22403983A JPS60117528A (en) | 1983-11-30 | 1983-11-30 | Manufacture of color picture tube |
| US06/648,143 US4671776A (en) | 1983-09-13 | 1984-09-07 | Manufacturing method of color picture tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22403983A JPS60117528A (en) | 1983-11-30 | 1983-11-30 | Manufacture of color picture tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60117528A JPS60117528A (en) | 1985-06-25 |
| JPH0467732B2 true JPH0467732B2 (en) | 1992-10-29 |
Family
ID=16807633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22403983A Granted JPS60117528A (en) | 1983-09-13 | 1983-11-30 | Manufacture of color picture tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60117528A (en) |
-
1983
- 1983-11-30 JP JP22403983A patent/JPS60117528A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60117528A (en) | 1985-06-25 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |