Cone glass for a display tube
AssigneeKoninklijke Philips Electronics N.V.
InventorJan Gerard Jacob Peelen
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Abstract
The invention relates to a method of preparing a cone glass for a display tube. The cone glass according to the invention is obtained by mixing a first portion of glass fragments having a known composition with a second portion of vitrifying materials, wherein the first portion contains glass fragments of cone glass and screen glass of a display tube, and wherein the composition of the second portion is chosen to be such that at least one of the physical properties of X-ray absorption, electrical resistance, thermal coefficient of expansion and viscosity is in a desired range.
Claims10
A cone glass for a display tube, which cone glass contains the following components:
- 1.7-2.3% by weight of Al2O3,
- 6.0-6.5% by weight of Na2O,
- 7.3-7.8% by weight of K2O,
- 2.0-2.6% by weight of MgO,
- 2.9-3.7% by weight of CaO,
- 0.2-2.2% by weight of SrO,
- 0.2-2.6% by-weight of BaO,
- 20.5-23%-by weight of PbO,
- 0.1-0.3% by weight of Sb2O3,
- 0.1-6.6% by weight of Zr02, up to 0.3% by weight of impurities, 48-59% by weight of SiO2.
Dependencies are inferred from the claim text.