Cathode-ray tube
专利汇可以提供Cathode-ray tube专利检索，专利查询，专利分析的服务。并且PURPOSE:To provide a picture screen in which a halo does not stand out conspicuous and which is easy to see by reducing the diameter of the halo by installing a transparent base plate having a fluorescent layer inside a face glass. CONSTITUTION:A transparent base plate 7 made of glass is installed inside the face glass 1 of a vacuum encircling case 10 in such a manner that the base plate 7 is parallel to the face glass 1 with a given distance allowed between them. The base plate 7 is fixed to the face glass 1 by means of a supporting member 8. A fluorescent layer 2 is formed on a surface of the base plate 7 opposite to its surface facing the face glass 1. When the refractive indexes of the base plate 7 and the face glass 1 are almost equal, the critical angle at the interface 9 between the base plate 7 and a vacuum 6 almost equals to that at the interface 4 between the face glass 1 and air 5 thereby preventing the fluorescent layer 2 from being reilluminated by light reflected by the interface 4. As a result, a halo develops only from the interface 9 between the base plate 7 and the vacuum 6. Since all the base plate 7 have to do is to support the fluorescent layer 2, the thickness of the base plate 7 can be made very small thereby enabling the diameter of the halo to be minimized.，下面是Cathode-ray tube专利的具体信息内容。
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