Patent ID: 6820443
Filing Date: 2004-11-23
Classification: C03C,H01J

Abstract:
A method of producing CRT funnel glass, comprising the steps of(1) preparing a glass material obtained from at least one of CRT panel glass and CRT frit containing at least one colorant selected from the group consisting of NiO, Co3O4, MnO2, and Cr2O3, (2) adding a varying amount of Fe2O3 of said glass material in the range of 0.05-1 mass %, depending on the amount of the colorant, to produce a mixture of the glass material with Fe2O3, (3) melting said mixture to produce a glass melt, and (4) producing said CRT funnel glass from said glass melt such that, at a thickness of 10 mm, the CRT funnel glass has a fluctuation of transmittance of light at a wavelength of 1,050 nm of 10% or less.