Ultraviolet-absorbing glass tube for fluorescent lamp and glass tube comprising the same for fluorescent lamp

Abstract

An ultraviolet-absorbing glass for fluorescent lamps which comprises a borosilicate glass comprising, in terms of mass%, 60-80% SiO2, 1-7% Al2O3, 10-25% B2O3, 3-15% Li2O+Na2O+K2O, 0-5% CaO+MgO+BaO+SrO+ZnO, 0.1-5% CeO2, 0.005-0.1% Fe2O3, 0.01-5% SnO+SnO2, and 0.1-10% ZrO2+ZnO. The proportion of Ce ions to all Ce ions in the borosilicate glass is 10% or lower, and the glass has an average coefficient of linear expansion in a 0-300 DEG C range defined in JIS R3102 of 36-57*10 / DEG C.

Description

technical field [0001] The present invention relates to ultraviolet absorbing glass, and relates to glass suitable for fluorescent lamps used in peripheral devices of light sources that emit ultraviolet rays, especially for backlights of display devices such as liquid crystal displays (hereinafter sometimes referred to as LCDs), and glass tubes for fluorescent lamps using the glass . Background technique [0002] In recent years, liquid crystal displays (hereinafter sometimes referred to as LCDs) have been widely used as key devices in multimedia-related equipment. However, with the expansion of their applications, there are also demands for lightweight, thinner, lower power consumption, higher brightness, and lower cost. etc. In particular, among LCDs, high-quality display devices are required for personal computer monitors, vehicle-mounted display devices, TV monitors, and the like. On the other hand, since the liquid crystal display element itself does not emit light, f...

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, in these patent documents, especially containing CeO 2 Since the glass is easy to absorb in the visible area, it is not suitable for liquid crystal TVs that require sufficient brightness and color reproducibility.

Images