Ultraviolet absorbing glass, glass tube for fluorescent lamp using same, and method for producing ultraviolet absorbing glass for fluorescent lamp

Abstract

Disclosed is an ultraviolet absorbing glass for fluorescent lamps which is composed of a borosilicate glass containing, in mass%, 60-80% of SiO2, 1-7% of Al2O3, 10-25% of B2O3, 3-15% of Li2O + Na2O + K2O, 0-5% of CaO + MgO + BaO + SrO + ZnO, 0.001-0.05% of Fe2O3, 0.1-5% of CeO2, 0.01-5% of SnO + SnO2 and 0.01-5% of ZrO2 + ZnO + Nb2O5, and having an average linear expansion coefficient in the range of 0-300 DEG C of 36-57 10-7 / DEG C which is determined in accordance with JISR 3102.

Description

Technical field [0001] The present invention relates to ultraviolet absorbing glass, and it relates to glass suitable for fluorescent lamps used in backlights of display devices such as liquid crystal displays (hereinafter sometimes referred to as LCDs), which are suitable for peripheral equipment accompanied by light sources that emit ultraviolet rays, and fluorescent lamps using the glass. And a method for manufacturing ultraviolet absorbing glass for fluorescent lamps. Background technique [0002] In recent years, as a key device of multimedia-related equipment, liquid crystal displays (hereinafter sometimes referred to as LCDs) have been widely adopted. However, as their uses have expanded, they have also been required to be lighter, thinner, lower power consumption, higher brightness, and lower cost.化 etc. In particular, even among LCDs, high-quality display devices are required for personal computer displays, in-vehicle display devices, TV monitors, and the like. On the ot...

AI Technical Summary

Problems solved by technology

[0016] The glass disclosed in the above-mentioned patent documents 2, 3, and 4, by combining WO 3 , ZrO 2 , SnO 2 , Fe 2 o 3 , CeO 2 , the UV cut-off characteristics were adjusted, but it cannot be said that the characteristics of both the UV cut-off characteristics of 315nm and the devitrification in the secondary processing are fully satisfied. There is Fe 2 o 3 , CeO 2 、TiO 2 There is a tendency to mutually enhance the coloring, the absorption characteristic at 315nm is affected by the molten state of the glass, and there is a problem that the absorption end of ultraviolet rays is unstable

In addition, especially containing CeO 2 Since the glass is easy to absorb in the visible area, it is not suitable for LCD TVs that require good brightness and color reproducibility