Process for forming phosphor screen
AssigneeHitachi, Ltd.
InventorsYasukazu Morita, Naomitsu Watanabe
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Abstract
A phosphor screen good in quality without greatly lowering brightness can be produced on a cathode-ray tube faceplate by the settling process wherein there is used a suspension of phosphor particles which are susceptible to hydrolysis or dissolution prepared by using an alkaline aqueous solution having a pH of 10 to 13 and if necessary with a small amount of water glass, or the above-mentioned phosphor suspension is poured into a cushion solution having a pH of 10 to 13, said cushion solution being able to contain a small amount of water glass.
Claims10
In a process for forming a phosphor screen on a cathode-ray tube faceplate by a settling process using a suspension of phosphor particles, the improvement which comprises using as the suspension one obtained by suspending phosphor particles which are susceptible to hydrolysis or dissolution in an alkaline aqueous solution which has a pH of 10 to 13 and contains a small amount of water glass.
In a process for forming a phosphor screen on a cathode-ray tube faceplate by a settling process using a suspension of phosphor particles, the improvement which comprises using a cushion solution having a pH of 10 to 13 and adding to the cushion solution a suspension obtained by suspending phosphor particles which are susceptible to hydrolysis or dissolution in an alkaline aqueous solution which has a pH of 10 to 13 and contains a small amount of water glass.
In a process for forming a phosphor screen on a cathode-ray tube faceplate by a settling process using a suspension of phosphor particles, the improvement which comprises using a cushion solution having a pH of 10 to 13 and containing a small amount of water glass, and addding to the cushion solution a suspension obtained by suspending phosphor particles which are susceptible to hydrolysis or dissolution in an alkaline aqueous solution which has a pH of 10 to 13 and may contain a small amount of water glass.
A process for forming a phosphor screen on a cathode-ray tube faceplate, which comprises placing a cushion solution having a pH of 10 to 13 and being able to contain a small amount of water glass in a bulb of a cathode-ray tube, pouring a suspension obtained by suspending phosphor particles which are susceptible to hydrolysis or dissolution in an alkaline aqueous solution which has a pH of 10 to 13 and may contain a small amount of water glass to the cushion solution, the water glass being present in the cushion solution and/or the suspension, allowing the resulting mixtures to stand still to deposit a phosphor layer, removing the remaining solution slowly, and drying the deposited phosphor layer.
Dependencies are inferred from the claim text.