Glass for projection kinescope tube panel

Abstract

The composition of R2O-BaO (SrO)-ZnO-ZrO2-SiO2 system glass for projection kinescope tube screen is formed from (weight%): SiO2 50-60, Al2O3 0.1-1.0, Li2O 0.5-2.5, Na2O 2-5, K2O 6-12, Li2O+Na2O+K2O 13-20, K2O / Li2O+Na2O+K2O 0.5-0.7, BaO 10-15, SrO 3-10, BaO+SrO 15-24, ZnO 5-7, ZrO2 1-3, CeO2 0.3-1, TiO2 0.25-1, CeO2+TiO2 0.6-1.5, Sb2O3 0.5-1.2, Fe2O3 is less than or equal to 0.020 and the CeO2 and TiO2 are introduced. It has good anti-electron-bombardment discolouration capability and x-ray irradiation discolouration capability, its 0.6A wavelength X-ray absorption coefficient mu is greater than 37 cm (-1), and its melting clarification temp. is less than 1400 deg.C, so that it has good precision press-forming capability.

Description

technical field [0001] The invention belongs to the glass used for the tube screen of a picture tube, in particular to a glass used for the tube screen of a projection picture tube. Background technique [0002] The so-called projection TV has two types: front projection type and rear projection type. It is composed of three projection tubes of red, green, and blue. It is a color TV image, which has the advantages of large screen, high definition and high brightness. Due to the limited screen size of traditional direct-view CRT (anode ray tube) TVs, when the screen size is larger than 86cm, it is not economically feasible, and projection TVs, especially rear-projection projection TVs, can easily reach a size of more than 101cm Screens have been commercialized at present. Compared with large-screen PDP and LCD TVs, they are cheap, bright, and easy to maintain, so they have considerable advantages. The technical requirements for the screen glass of the ordinary direct-viewin...

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Problems solved by technology

[0003] ① In order to ensure the high brightness of the large screen of the projection screen, the glass should have a high transmittance. The transmittance T of the 546nm wavelength and 10.16mm thick sample is > 89%, and the appearance cannot appear yellow. The yellow color is caused by the absorption of blue light by the glass. It will inevitably cause the electron gun of the blue projection tube to operate at a higher voltage to compensate for the absorption loss, thus detrimental to the tube life

[0014] Glasses proposed in Patent Publication 4-6655 containing 3-10% ZrO 2 But without SrO, the X-ray absorption coefficient is low, only 25cm -1

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