| 摘要 |
1,211,730. Luminescent screens. PHILIPS ELECTRONIC & ASSOCIATED. INDUSTRIES Ltd. 28 Dec., 1967 [31 Dec., 1966], No. 58839/67. Heading C4S. A method of manufacturing a cathode-ray tube comprises forming an unbaked non- luminescent silicate layer (preferably an inorganic silicate e.g. of potassium or sodium silicate and 0À2 to 0À5 microns thick e.g. 0À4 microns), on the inside surface of the tube by applying a solution of a non-luminescent silicate and drying, and forming a luminescent layer containing a ZnCdS phosphor (e.g. greenemitting, silver activated and with 34% by wt. of CdS) over the unbaked silicate layer, the phosphor being applied in the form of a suspension in an organic binder e.g. polyvinyl alcohol. In a colour tube for example, the silicate layer is formed by pouring a 3À6 to 7% solution of potassium silicate in water on to the rotating tube window, the K 2 O: SiO 2 ratio being 1: 3À5. |
