CRT funnel of a non beam-index type

摘要

A CRT funnel of a non beam-index type is made of a lead glass which contains 10-30 mass % of PbO and has an X-ray absorption coefficient of 40 cm<-1 >or more at 0.6 Å. The lead glass further contains Sb2O3 and an additive including at least one of CeO2 and SnO2. In case where the additive includes CeO2, it is preferable that the content of CeO2 is not smaller than 0.01 mass % and is smaller than 0.5 mass %. In case where the additive includes SnO2, the content of SnO2 preferably falls within a range of 0.001-2 mass %.