JPS58145048A - Cathode-ray tube - Google Patents

Abstract

PURPOSE:To improve a panel cooling effect through a coolant, by sealing the coolant in an enclosed space surrounded by a fluorescent screen panel, part of a panel skirt, metallic structure and transparent panel. CONSTITUTION:A metallic structure 1a having a heat radiation effect is arranged to the periphery of a fluorescent screen panel 2 leaving a gap also between the structure and panel skirt part 6, and a transparent panel 3 separately located with a prescribed length in the front from the panel 2 is supported by a front end part of the structure, then a rear end part of the structure is connected and secured to the part 6. Then an enclosed space surrounded by the panel 2, part of the skirt 6, structure 1a and the panel 3 is formed, and a coolant 5 is sealed in said space. In this way, contact area of the coolant 5 to the structure 1a is substantially increased to improve a heat radiation effect, causes a very small temperature rise in the central part of the panel 2, almost eliminates deterioration of brightness of a fluorescent material and prevents generation of a crack in the panel 2.

Description

【発明の詳細な説明】 本発明は螢光面における発熱量の大きい高輝度管、特に
投写管に好適な陰極線管に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cathode ray tube suitable for high-intensity tubes with a large amount of heat generated in the fluorescent surface, particularly projection tubes.

高輝度陰極線管は、高輝度画像を得るために、螢光面を
刺激発光させる電子ビームのエネルギーを高めているの
で、螢光面における発熱量も当然大きい。一方螢光体の
塗布されているパネルのガラスの熱伝導度は比較的低い
ので、螢光面で発生した多鰍の熱は、陰極線管他部には
余り伝導されず、そのため連続動作時には、パネル中央
部の温度は著しく上昇する。この著しい温度上昇は、螢
光体を劣化させて輝度の低下をもたらし、またパネル中
央部と周辺部との著しい温度差のために時としてパネル
がクラックするにいたる。In high-brightness cathode ray tubes, in order to obtain high-brightness images, the energy of the electron beam that stimulates the fluorescent surface to emit light is increased, so naturally the amount of heat generated in the fluorescent surface is large. On the other hand, since the thermal conductivity of the panel glass coated with phosphor is relatively low, the heat generated by the phosphor surface is not sufficiently conducted to other parts of the cathode ray tube, so during continuous operation, The temperature in the center of the panel increases significantly. This significant temperature increase deteriorates the phosphor, resulting in a decrease in brightness, and sometimes leads to panel cracking due to the significant temperature difference between the center and peripheral areas of the panel.

かかる問題に対処するため、螢光面パネルの外側面を透
明冷媒たとえば対流が生ず゛る液体で冷却するようにし
た陰極線管が提案されている。To address this problem, cathode ray tubes have been proposed in which the outer surface of the fluorescent panel is cooled with a transparent coolant, such as a liquid that causes convection.

第１図は従来の液体冷媒で螢光面パネルを冷却するよう
にした陰極線管の例を示し１図中、１は金Ｍ構体、２は
螢光面パネル、３は透明パネル、４は接着剤、５は螢光
面冷却用の冷媒たとえばエチレングリコール溶液である
。この従来の例では冷媒の対流によりパネル２前ｄｉ１
部の熱が金属構体１に伝達され、この伝達された熱は金
属構体Ｉの表面から外部圧放散される。この様にしてパ
ネル２の中央部の温度上昇は少なくなり、輝度の低下も
減少し、またパネルクラック発生防止の効果も認められ
た。しかしこの従来の管は、金属構体１の外気に接する
面積は広いが、金Ｎ構体１と冷媒５との接触面積が狭く
、そのために冷媒５の熱が金属構体１に効率的に伝達さ
れず、結局全体として放熱効果が小さいという欠点があ
った。Figure 1 shows an example of a cathode ray tube in which the fluorescent panel is cooled with a conventional liquid refrigerant. In the figure, 1 is the gold M structure, 2 is the fluorescent panel, 3 is the transparent panel, and 4 is adhesive. The agent 5 is a refrigerant for cooling the fluorescent surface, such as an ethylene glycol solution. In this conventional example, di1 in front of panel 2 due to refrigerant convection.
The heat of the metal structure 1 is transferred to the metal structure 1, and the transferred heat is dissipated from the surface of the metal structure I by external pressure. In this way, the temperature rise in the center of the panel 2 was reduced, the decrease in brightness was also reduced, and the effect of preventing panel cracks was also observed. However, in this conventional tube, although the metal structure 1 has a large area in contact with the outside air, the contact area between the gold-N structure 1 and the refrigerant 5 is small, and therefore the heat of the refrigerant 5 is not efficiently transferred to the metal structure 1. However, the overall drawback was that the heat dissipation effect was small.

本発明の目的は、上記従来の液体冷媒でパネルを冷却す
る管の欠点を除き、冷媒によるパネル冷却効果を向上さ
せた陰極線管を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a cathode ray tube that eliminates the drawbacks of the conventional tube for cooling the panel with a liquid refrigerant and improves the panel cooling effect using the refrigerant.

上記目的を達成するために本発明においては、放熱効果
を有する金属構体を螢光面パネルの周囲に、パネルスカ
ート部との間にも間隙を残して配替光面パネルスカート
部またはファンネル部に接続固着させ５螢光面パネル、
パネルスカート部の少なくとも一部、金属構体、および
透明パネルに囲まれた密閉空間を形成させて、この空間
内に冷媒を封入し、冷媒と金属構体との接触面積を従来
に比し、はるかに広くした。In order to achieve the above object, in the present invention, a metal structure having a heat dissipation effect is placed around the phosphor panel and attached to the rear panel skirt part or the funnel part, leaving a gap between the phosphor panel and the panel skirt part. Connect and fix 5 fluorescent surface panels,
A sealed space is formed surrounded by at least a portion of the panel skirt, the metal structure, and the transparent panel, and the refrigerant is sealed in this space, making the contact area between the refrigerant and the metal structure much larger than before. Made it wider.

第２図は本発明一実施例の要部を示し、１ａは冷媒との
接触面積が大幅に広くなった金属構体、６はパネルスカ
ート部で、その他の符号は第１図の場合と同様である。FIG. 2 shows the main parts of one embodiment of the present invention, where 1a is a metal structure with a significantly increased contact area with the refrigerant, 6 is a panel skirt, and other symbols are the same as in FIG. 1. be.

本実施例な長時間連続動作させたところ、放熱効果が向
上して、螢光向バネのクラック発生も防止された。なお
第２図かられかるように１本実施例ではパネルスカート
部６が冷媒５に接触しているため、パネル前面部）　Ｍ
Ｂとパネル前面部との温度が均一化され、パネルクラッ
ク防止効果は特に顕著だった。When the present example was operated continuously for a long time, the heat dissipation effect was improved and the generation of cracks in the fluorescent spring was also prevented. In addition, as can be seen from FIG. 2, in this embodiment, the panel skirt portion 6 is in contact with the refrigerant 5, so the front surface of the panel) M
The temperature between B and the front part of the panel was made uniform, and the effect of preventing panel cracking was particularly remarkable.

以上説明したように本発明によれば、パネル温度が低下
して螢光体の輝度劣化が減少し、かつパネルクラック防
止にも著効が得られる。As explained above, according to the present invention, the panel temperature is lowered, the luminance deterioration of the phosphor is reduced, and a remarkable effect is obtained in preventing panel cracks.

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

第１図はパネル冷却に液体冷媒を用いた従来の例を示す
図、第２図は本発明実施例要部図である。 １ａ・・・金属構体、２・・・螢光面パネル、３・・・
透明パネル、４・・・接着剤、５・・・冷媒、６・・・
パネルスカート部。 代理人　弁理士　　薄　１）利　拳 第　　１ 第２図 ／／′ ２１８− ２ ｆ ３ 一ダ ｆ ３FIG. 1 is a diagram showing a conventional example in which a liquid refrigerant is used for panel cooling, and FIG. 2 is a diagram showing main parts of an embodiment of the present invention. 1a... Metal structure, 2... Fluorescent panel, 3...
Transparent panel, 4...adhesive, 5...refrigerant, 6...
Panel skirt section. Agent Patent Attorney Usui 1) Li Ken 1st Figure 2//' 218- 2 f 3 Ida f 3

Claims (1)

【特許請求の範囲】[Claims] 放熱効果を有する金属構体な螢光面パネルの周囲に、パ
ネルスカート部との間にも間隙を残して配置し、その前
端部で、螢光面パネルの前方に所定長隔てて透明パネル
を支持させ、その後端部で、螢光面パネルスカート部ま
たはファンネル部に接続固着させ、螢光面パネル、パネ
ルスカート部の少なくとも一部、金属構体、および透明
パネルに囲まれた密閉空間を形成させて、この空間内に
冷媒を封入したことを特徴とする陰極線管。A transparent panel is placed around a metal-structured fluorescent panel that has a heat dissipation effect, leaving a gap between it and the panel skirt, and supports a transparent panel at a predetermined distance in front of the fluorescent panel at its front end. and the rear end thereof is connected and fixed to the fluorescent panel skirt portion or the funnel portion to form an enclosed space surrounded by the fluorescent panel, at least a portion of the panel skirt portion, the metal structure, and the transparent panel. , a cathode ray tube characterized in that a refrigerant is sealed in this space.