| 摘要 |
PURPOSE:To obtain a CRT having no tendency of generating high voltage sparks and riskless of generating a hole on a neck section even if a spot knocking process is applied by depositing a metal oxide film with a specific surface resistance value on an annular area facing the low voltage three-electrode section of an electron gun on the inner periphery of the neck section of a glass bulb. CONSTITUTION:A metal oxide film 12 annularly deposited at the vicinity facing the low voltage three-electrode section of an electron gun on the inner periphery of the neck section 2 of a glass bulb 1 is made from a transition metal of, e.g., Fe, Ni, Zn, Mn, Cr, In, Sn, etc. and has a surface resistance value of 10<2>- 10<13>OMEGA/?. The metal oxide film 12 is formed, for example, by generating an iron nitrate aqueous solution with a predetermined composition, coating with it the predetermined annular area on the inner periphery of the neck section of the glass bulb by a dip method or a spray method, etc., next drying this coating at a temperature of about 150 deg.C for several minutes, then baking it in the air at a temperature of 500-550 deg.C for about 30min. |
