【考案の詳細な説明】[Detailed explanation of the idea]
本考案は、陰極線管の製造過程における管体内
の排気処理に際して用いる陰極線管の電子銃焼装
置に関する。
陰極線管の製造において、第１図に示すよう
に、その管体１内に各処理、各部品のとりつけ配
置を行つて後、そのネツク部１ｎの端部に設けら
れたチツプオフ管２を通じて排気を行い管内を高
真空にした状態でチツプオフ管２を気密封止、即
ちチツプオフして完成管を得る。この場合排気封
止後において、管体自体や管体内に配置された各
種部材や、螢光体等からガスや異物が放出して管
内の真空度を低下させて陰極線管の耐用年数を短
縮させたり、不良品を発生させたりすることのな
いように、この排気作業中に陰極線管を加熱炉中
で、第２図に示すような温度プログラミングをも
つて加熱するいわゆる排気ベーキング処理を行つ
て、各部から不要なガスの放出、異物の放出を積
極的に行い、これらを管内から排除するという方
法がとられる。また、これと同時に、特に電子銃
３が収容されるネツク部１ｎの周囲に高周波電流
を通ずる高周波コイル４を巻回配置し、これによ
つて電子銃３を構成する各筒状電極に誘導電流を
発生させてこれらを加熱させるいわゆる誘導加熱
を行なつてこれら電極よりのガスの放出を効果的
に行ういわゆる電子銃焼きを行う。図において、
電子銃３は、３本のカソード電極Ｋと、第１〜第
５グリツドG1〜G5より構成されている。この電
子銃焼きは、通常、例えば180〜240秒間程度行う
が、この時、例えば第１グリツドG1及び第５グ
リツドG5において700℃〜750℃、第３グリツド
G3において800℃〜850℃程度の加熱を行うの
で、これよりの輻射熱や、前述した加熱炉による
熱によつて高周波コイル４も高温に熱せられる。
通常、この高周波コイル４は、ガラスチユーブが
被覆された銅線の巻回体より構成されるが、この
ような構造のコイル４を用いると、上述した熱に
よる焼損が生じ、コイル４の巻回部間に絶縁不良
が生じ、高周波誘導の効率の低下、したがつて品
質の低下を来すなど、信頼性を低下させる。
そこで、この高周波コイル４として、第３図に
その断面を示すように、中空５を有するパイプ状
の銅線６にガラスチユーブ７を被覆した構造とな
し、中空５内にコイル４の一端から他端に向つて
冷却水を通じて、コイル４の焼損を回避する方法
も採られているが、このように冷却水を用いるな
どの冷却手段を設けることは、この装置に関連す
る設備が著しく大型化され、またその取扱いも煩
雑となる。
本考案は、このような欠点がなく信頼性の高い
陰極線管を得ることができるようにした陰極線管
の電子銃焼装置を提供するものである。
即ち、本考案においては、陰極線管の製造過程
The present invention relates to an electron firing apparatus for cathode ray tubes used for exhaust treatment inside a tube during the manufacturing process of cathode ray tubes. In the manufacture of cathode ray tubes, as shown in FIG. 1, after each process and each component are installed and arranged inside the tube body 1, exhaust air is discharged through the tip-off tube 2 provided at the end of the neck portion 1n. Then, the tip-off tube 2 is hermetically sealed, ie, chipped off, with the inside of the tube under high vacuum to obtain a finished tube. In this case, after the exhaust is sealed, gas and foreign matter are released from the tube itself, various components placed inside the tube, and phosphors, etc., reducing the degree of vacuum inside the tube and shortening the service life of the cathode ray tube. During this evacuation process, the cathode ray tube is heated in a heating furnace with temperature programming as shown in Figure 2 to prevent the production of defective products. A method is adopted in which unnecessary gases and foreign substances are actively released from each part and these are removed from the pipe. At the same time, a high-frequency coil 4 for passing a high-frequency current is wound around the neck portion 1n in which the electron gun 3 is housed, thereby causing an induced current in each cylindrical electrode constituting the electron gun 3. So-called induction heating is performed to generate and heat these, and so-called electron gun firing is performed to effectively release gas from these electrodes. In the figure,
The electron gun 3 is composed of three cathode electrodes K and first to fifth grids G1 to G5 . This electron gun firing is normally carried out for about 180 to 240 seconds .
Since heating is performed at G 3 to about 800° C. to 850° C., the high frequency coil 4 is also heated to a high temperature by the radiant heat from this and the heat from the heating furnace described above.
Normally, this high frequency coil 4 is composed of a wound body of copper wire covered with a glass tube, but if a coil 4 having such a structure is used, the above-mentioned burnout due to heat will occur, and the winding of the coil 4 will be damaged. Poor insulation occurs between the parts, reducing the efficiency of high-frequency induction and thus quality, which reduces reliability. Therefore, as shown in the cross section of FIG. 3, this high-frequency coil 4 has a structure in which a pipe-shaped copper wire 6 having a hollow 5 is coated with a glass tube 7. A method has been adopted to avoid burnout of the coil 4 by passing cooling water toward the end, but providing a cooling means such as using cooling water in this way requires that the equipment related to this device becomes significantly larger. , and its handling is also complicated. The present invention provides an electron firing apparatus for cathode ray tubes that does not have these drawbacks and makes it possible to obtain highly reliable cathode ray tubes. That is, in the present invention, the manufacturing process of cathode ray tubes is
【表】
そして、この結果、上述の本案装置のコイル１
４を用いるときは、従来と同程度の出力を得るの
に、コイル１４の軸心方向の長さを従来のそれに
比し７mm程度短縮できる。これに伴つて例えば第
１図に示すように陰極線管１の内面に被着され高
圧が印加される導電層１６に弾性的に接触し、電
子銃３の高圧電極（例えばグリツドG5及びG3）に
高圧供給を行うために電子銃３の先端に設けられ
スプリング１７の外周にまでコイル１４が延び、
これによつて、このスプリング１７を不要に誘導
加熱して、これに特性劣化を来すような現象を回
避できる利益もある。
上述したように本案装置によれば冷却水等を用
いずに、絶縁特性にすぐれた高周波コイルを用い
るものであり、冒頭に述べた諸欠点を全廃できる
ので、実用に供して大きな利益をもたらすことが
できる。[Table] As a result, coil 1 of the above-mentioned device
4, the length of the coil 14 in the axial direction can be reduced by about 7 mm compared to the conventional one, while obtaining the same output as the conventional one. Along with this, for example, as shown in FIG. 1, the conductive layer 16 applied to the inner surface of the cathode ray tube 1 is elastically contacted, and the high voltage electrodes of the electron gun 3 (for example, grids G 5 and G 3 ), a coil 14 is provided at the tip of the electron gun 3 and extends to the outer periphery of the spring 17.
This also has the advantage of avoiding unnecessary induction heating of the spring 17 and deterioration of its characteristics. As mentioned above, the proposed device uses a high-frequency coil with excellent insulation properties without using cooling water, and the various drawbacks mentioned at the beginning can be completely eliminated, so it can be put to practical use and brings great benefits. Can be done.
【図面の簡単な説明】[Brief explanation of the drawing]
第１図は陰極線管の電子銃焼き操作の説明図、
第２図はその温度プログラム図、第３図は従来装
置の一例の高周波コイルの断面図、第４図及び第
５図は本案装置の高周波コイルの一例の断面図及
び上面図である。
１４は高周波コイル、８はその金属導線、９は
その表面の不導体膜、１は陰極線管、３は電子銃
である。
Figure 1 is an explanatory diagram of the electron gun firing operation of a cathode ray tube.
FIG. 2 is a temperature program diagram thereof, FIG. 3 is a cross-sectional view of a high-frequency coil of an example of a conventional device, and FIGS. 4 and 5 are a cross-sectional view and a top view of an example of a high-frequency coil of the present device. 14 is a high frequency coil, 8 is a metal conductor thereof, 9 is a nonconductor film on its surface, 1 is a cathode ray tube, and 3 is an electron gun.