CRT funnel glass

Abstract

On producing CRT funnel glass from CRT panel glass or CRT frit, Fe 2 O 3 is added in a range of 0.05 to 1 mass % so that the fluctuation of transmittance of light having a wavelength of 1,050 nm becomes 10% or less, at a thickness of 10 mm of the produced CRT funnel glass.

1 - 4 . (canceled).  
     
     
         5 . CRT funnel glass containing Fe 2 O 3  in a range of 0.05 to 1 mass %.  
     
     
         6 . The CRT funnel glass according to  claim 5 , which is produced from a glass material including CRT panel glass.  
     
     
         7 . The CRT funnel glass according to  claim 5 , which is produced from a glass material including CRT frit.  
     
     
         8 . The CRT funnel glass according to  claim 5 , wherein said CRT funnel glass has a glass composition containing a colorant comprising at least one selected from the group consisting of NiO, Co 3 O 4 , MnO 2  and Cr 2 O 3 .  
     
     
         9 . The CRT funnel glass according to  claim 8 , wherein transmittance of light with a wavelength of 1,050 nm in a thickness of 10 mm of said CRT funnel glass is 50% or greater.  
     
     
         10 . The CRT funnel glass according to  claim 8 , wherein the content of said colorant is 10,000 ppm or less.  
     
     
         11 . The CRT funnel glass according to  claim 5 , wherein said CRT funnel glass has a glass composition containing, in mass %, 48 to 58% SiO 2 , 0.5 to 6% Al 2 O 3 , 10 to 30% PbO, 0 to 5% MgO, 0 to 6% CaO, 0 to 9% Sro, 0 to 9% BaO, 3 to 9% Na 2 O, 4 to 11% K 2 O, 0 to 3% ZrO 2 , 0 to 5% ZnO, and 0.05 to 1% Fe 2 O 3 .