| 摘要 |
PURPOSE:To prevent the generation of clogging, by preparing a solution with a specific mixing ratio of the water and the SiO2 in a water glass, making it together with microparticles of a heavy metal or the like into a slurry, spreading it over a shadow mask, and heattreating to make an electron reflecting membrane. CONSTITUTION:Taking the standard to the mean particle diameter (dmum) of a heavy metal or its oxide, the mixing ratio (Z) of the water (Wl) and the amount of SiO2 (Gcc) in a water glass is prepared in the volume ratio as shown in the formula, to get a slurry consisting of microparticles of the heavy metal or its oxide, the water glass, and the water. The slurry is applied to the surface of a shadow mask by a spray-coating device, and then a heat-treating process is given to form an electron reflection membrane on the shadow mask for a color cathode-ray tube. Therefore, as well as the spreading of the membrane to the fluorescent screen side is restricted to prevent clogging from production, the uneven membrane thickness, generation of residual gas, and the like can be prevented.
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