| 摘要 |
The invention relates to a glass substrate whose chemical composition comprises the following components within limits defined thereafter and expressed in percentages by weight: 58-72% by weight SiO<SUB>2</SUB>, 0.8-3 by weight TiO<SUB>2</SUB>, 2-15 by weight B<SUB>2</SUB>O<SUB>3</SUB>, 10-25 by weight Al<SUB>2</SUB>O<SUB>3</SUB>, 5-12 by weight CaO, 0-3 by weight MgO, 0-6 by weight BaO, 0-4 by weight SrO, 0-3 by weight ZnO, and 0-1 by weight R<SUB>2</SUB>O.
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