| 摘要 |
PURPOSE:To reduce doming by forming a lead borate glass layer on the principal surface of a shadow mask, performing high frequency induced heating, semi- melting and tentatively fixing the layer, mounting it on a panel, and heating and sintering the glass layer. CONSTITUTION:A lead borate glass layer is applied and formed at least on the surface of an electron gun side of a shadow mask 5 with a pricipal surface on whih a number of permeation holes are perforated, proximately opposed to a phosphor screen 4 provided on the inner surface of a panel 1, arranged in a coil to which high frequency current is applied, induced-heated, semi-melted, and tentatively fixed to the shadow mask 5. Then the lead borate glass layer is sealed in the panel 1, combined with a funnel 2, passes through a heat treatment furnace, and glassified. As a result, the doming of the shadow mask 5 is effectively reduced without increasing production facilities and working time and color shift can be eliminated. |
