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一、荫条管的提出 自从美国无线电公司（RCA）研制的列三荫向在以来,日本的索尼公司就对彩色电视显象管进行了研究,整图找出一种崭新原理的彩显管与RCA相抗衡。但是索尼公司从经验中体会到,必须研制一种满足下列条件的管子: （1）选色机构的透明度要比较高: （2）管子内部要像荫孔管那样没有电场 （3）必须在一条线上同时产生三条电子束的单一电子。
First, the shade tube proposed Since the United States Radio Company (RCA) development of the Three Shades since the Japanese company Sony on the color TV picture tube was studied, the whole map to find a new principle of color tube To compete with RCA. However, Sony has learned from experience that it is necessary to develop a tube that meets the following conditions: (1) the transparency of the color selection mechanism is relatively high: (2) the interior of the tube needs no electric field like the tube A single electron that produces three electron beams simultaneously online.