| 摘要 |
PCT No. PCT/JP84/00507 Sec. 371 Date Jun. 18, 1985 Sec. 102(e) Date Jun. 18, 1985 PCT Filed Oct. 25, 1984 PCT Pub. No. WO85/02056 PCT Pub. Date May 9, 1985.The present invention is to positively provide a light pen pick-up phosphor pattern by the application of an inverting method and the selection of its slurry composition. That is, this invention relates to a method for producing a phosphor screen of a cathode ray tube which comprises the steps of forming a photo-sensitive material layer with a predetermined pattern on the inner surface of a cathode ray tube panel, coating on the whole surface of the panel including the photo-sensitive material layer with a phosphor slurry for use in light pen pick-up and removing the photo-sensitive material layer to thereby form a light pen pick-up phosphor pattern which is an inverted pattern of the former pattern. In this case, the phosphor slurry is made of silica and polyvinyl alcohol, wherein if an amount (weight) of silica is taken as S, an amount (weight) of solid component of polyvinyl alcohol is taken as B and an amount (weight) of phosphor is taken as P, the ratio S/B is selected in a range from 1 to 15 and the ratio S/B is selected in a range from 5 to 30. |
