| 摘要 |
The lead-free, preferably lithium-free, optical glass is useful in imaging, projection, telecommunications, optical communication and/or laser technology, particularly for making precise-pressed optical elements. It has a refractive index n<SUB>d </SUB>of 1.50 to 1.57, an Abbé number nud of 61 to 70. It also has a low transformation temperature of about or below 400° C., good production and processing properties and crystallization resistance. It has a composition, in percent by weight, based on oxide content of P<SUB>2</SUB>O<SUB>5</SUB>, 40 to 60; Al<SUB>2</SUB>O<SUB>3</SUB>, 1 to 20; B<SUB>2</SUB>O<SUB>3</SUB>, 0 to <5; NA<SUB>2</SUB>O, 0 to 30; K<SUB>2</SUB>O, 0 to 30; Li<SUB>2</SUB>O, 0 to <1; SigmaM<SUB>2</SUB>O, >15 to 40; BaO, 1 to 20; ZnO, 1 to 20; SrO, 0 to 5; CaO, 0 to 5; MgO, 0 to 5; and SigmaMO, 5 to 25. In addition, it may contain standard refining agents, although it is preferably free of arsenic and fluorine.
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