| 摘要 |
PURPOSE:To reduce scattering area of vapor deposition on the neck part without vapor-depositing molybdnum thereon, by forming an annular conductive lead out of a wire material whose core is made of molybdenum and surface is coated with a metal having a vapor pressure higher enough than that of molybdenum. CONSTITUTION:An annular conductive lead 15 is formed on the core made of molybdenum wire out of a wire material coated with a metal having a vapor pressure higher enough than that of molybdenum. Therefore, in a cathode-ray tube provided with such annular conductive lead 15, a vapor-deposited film 17 is formed upon exhaust process without having cupper which is evaporated by the heat of an electrode generated from a high frequency coil 16b. Further, as the evaporation starting temperature is 2,450 deg.C about 1,200 deg.C higher than that of cupper, 1,250 deg.C, if scattering of the heating temperature becomes larger due to scattering of the position of the high frequency coil 16b, the vapor- deposited film 17 can be formed by only cupper 19 coated on a core 18 without evaporating the core 18.
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